13,525 results match your criteria Nanotechnology [Journal]


Importance of point defect reactions for the atomic-scale roughness of III-V nanowire sidewalls.

Nanotechnology 2019 Apr 17. Epub 2019 Apr 17.

Departement Physique, Institut Superieur d'Electronique du Nord, 41 Boulevard Vauban, F-59046 Lille Cedex, Lille, FRANCE.

The surface morphology of III-V semiconductor nanowires protected by an arsenic cap and subsequently evaporated in ultrahigh vacuum is investigated with scanning tunneling microscopy and scanning transmission electron microscopy. We show that the changes of the surface morphology as a function of the nanowire composition and the nature of the seed particles are intimately related to the formation and reaction of surface point defects. Langmuir evaporation close to the congruent evaporation temperature causes the formation of vacancies which nucleate and form vacancy islands on {110} sidewalls of self-catalysed InAs nanowires. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1a4eDOI Listing
April 2019
1 Read

A composite of Fe3O4@C and multilevel-porous carbon as high-rate and long-life anode materials for lithium-ion batteries.

Nanotechnology 2019 Apr 17. Epub 2019 Apr 17.

State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, College of Chemistry & Chemical Engineering, Changsha 410082, P R CHINA, Changsha, CHINA.

The iron oxides-based anode materials are widely studied and reported due to their abundance, low cost, high energy density and environmental friendliness for lithium ion batteries (LIBs). However, the application of LIBs is always limited by the poor rate capability and stability. In order to tackle these issues, a novel material with carbon-encapsulated Fe3O4 nanorods stuck together by multilevel porous carbon (Fe3O4@C/PC) is prepared through directly carbonizing the Fe-based metal-organic framework under nitrogen atmosphere. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1a83DOI Listing

Dynamic properties of asymmetric double Josephson junction stack with quasiparticle imbalance.

Nanotechnology 2019 Apr 17. Epub 2019 Apr 17.

Institute of Nuclear Physics, M V Lomonosov Moscow State University, 1/2 Leninskie Gory, Moscow 119992, RUSSIA,, Moscow, 119991, RUSSIAN FEDERATION.

We study analytically and numerically the influence of the quasiparticle charge imbalance on the dynamics of the asymmetric Josephson stack formed by two inequivalent junctions: the fast capacitive junction JJ1 and slow non-capacitive junction JJ2. We find, that the switching of the fast junction into resistive state leads to significant increase of the effective critical current of the slow junction. At the same time, the initial switching of the slow junction may either increase or decrease the effective critical current of the fast junction, depending on ratio of their resistances and the value of the capacitance. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab1a8e
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http://dx.doi.org/10.1088/1361-6528/ab1a8eDOI Listing
April 2019
1 Read

Highly efficient nanocrystalline CsxMA1-xPbBrx perovskite layers for white light generation.

Nanotechnology 2019 Apr 17. Epub 2019 Apr 17.

Institute of Photonics and Nanotechnology, Vilnius University, Vilnius, LITHUANIA.

Perovskite light converting layers optimization for cost-efficient white light emitting diodes (LED) was demonstrated. High excitation independent internal quantum efficiency (IQE) of 80 % and weakly excitation dependent PL spectra suitable for white light generation were obtained in the mixed-cation Cs<sub>x</sub>MA<sub>1-x</sub>PbBr<sub>3</sub> perovskite nanocrystal layers with optimal x = 0.3 being determined by effective surface passivation and phase mixing as revealed by X-ray diffraction. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab1a69
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http://dx.doi.org/10.1088/1361-6528/ab1a69DOI Listing
April 2019
2 Reads

Cooling-field dependence of dipole-induced loop bias.

Nanotechnology 2019 Apr 17. Epub 2019 Apr 17.

College of Sciences, Shenyang, CHINA.

In ferromagnet/antiferromagnet bilayers and core/shell nanoparticles, an exchange-bias-like loop bias phenomenon in the ferromagnet is observed solely due to the long-range dipolar interactions between ferromagnet and antiferromagnet. With increasing cooling field, the loop bias field may increase from zero in the bilayers or from a negative value in the core/shell nanoparticles to a positive saturated value, depending on the interfacial dipolar interaction and/or ferromagnetic/antiferromagnetic thickness. Using a modified Monte-Carlo method and the Meiklejohn-Bean model, the interfacial dipole fields (up to several teslas) and the domain sizes imprinted on the interfacial antiferromagnet are explicitly calculated to elucidate the cooling-field dependence of loop bias, which is governed by distinct mechanisms at the flat and curved interfaces. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1a57DOI Listing

Laser micro-structured pressure sensor with modulated sensitivity for electronic skins.

Nanotechnology 2019 Apr 17. Epub 2019 Apr 17.

Key Laboratory of Safety Science of Pressurized System MOE School of Mechanical Engineering, East China University of Science and Technology, shanghai, CHINA.

Micro-structured pressure sensors with broad pressure sensing range, high sensitivity, rapid response speeds are highly desired for epidermal electronic skins. The widely used methods to fabricate micro-structured pressure sensors are lithography and biomaterial-templating, which is either complex in preparation procedure or uncontrollable in micro-structure morphology. In this work, laser micro-structured wearable pressure sensors with high-performance is developed for epidermal electronic skin. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab1a86
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http://dx.doi.org/10.1088/1361-6528/ab1a86DOI Listing
April 2019
2 Reads

Integration of GaN light-emitting diodes with a-Si:H TFTs for flexible displays.

Nanotechnology 2019 Apr 17. Epub 2019 Apr 17.

University of Waterloo, Waterloo, CANADA.

In this work, the successful integration of a-Si:H TFTs and high-efficiency μ-iLEDs on large-area flexible substrates has been demonstrated. A conventional low-temperature a-Si:H TFT fabrication process combined with a laser lift-off transfer procedure was used to combine the μ-iLEDs with flexible TFT pixel circuits. Electrical and optical characterization determined that the current-voltage and electroluminescence characteristics of the TFTs and LEDs did not change after integration onto the flexible platforms. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab1a5e
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http://dx.doi.org/10.1088/1361-6528/ab1a5eDOI Listing
April 2019
1 Read

Elastic properties and intrinsic strength of two-dimensional InSe flakes.

Nanotechnology 2019 Apr 17. Epub 2019 Apr 17.

University of Washington, Seattle, Washington, UNITED STATES.

Mechanical property of two-dimensional (2D) materials is critical for their applications in functional devices as well as for strain engineering. Here, we report the Young's modulus and breaking strength of multilayered InSe, an emerging 2D semiconductors of layered group III chalcogenide. Few-layer InSe flaks were exfoliated from bulk InSe crystal onto Si/SiO2 substrate with micro-fabricated holes, and indentation tests were carried using an Atomic Force Microscopy (AFM) probe. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab1a96
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http://dx.doi.org/10.1088/1361-6528/ab1a96DOI Listing
April 2019
2 Reads

Quantitative magnetic force microscopy using calibration on superconducting flux quanta.

Nanotechnology 2019 Apr 17. Epub 2019 Apr 17.

Physics, Universita degli Studi di Salerno, Fisciano, Campania, ITALY.

We present a new procedure that takes advantage of the magnetic flux quantization of superconducting vortices to calibrate the magnetic properties of tips for magnetic force microscopy (MFM). Indeed, a superconducting vortex, whose quantized flux is dependent upon Plank constant, speed of light and electron charge, behaves as a very well defined magnetic reference object. The proposed calibration procedure has been tested on new and worn tips and shows that the monopole point-like approximation of the probe is a reliable model. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1a4dDOI Listing

Gradients of Be-dopant concentration in self-catalyzed GaAs nanowires.

Nanotechnology 2019 Apr 17. Epub 2019 Apr 17.

Optoelectronics Research Centre, Physics Unit, Tampere University, Tampere, FINLAND.

Effective and controllable doping is instrumental for enabling the use of III-V semiconductor nanowires in practical electronics and optoelectronics applications. To this end, dopants are incorporated during self-catalyzed growth via vapour-liquid-solid mechanism through the catalyst droplet or by vapour-solid mechanism of the sidewall growth. The interplay of these mechanisms together with the competition between axial elongation and radial growth of nanowires can result in dopant concentration gradients along the nanowire axis. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab1a97
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http://dx.doi.org/10.1088/1361-6528/ab1a97DOI Listing
April 2019
1 Read

Force sensing with nanowire cantilevers.

Nanotechnology 2019 Apr 16. Epub 2019 Apr 16.

Department of Physics, Universitat Basel, Klingelbergstrasse 82, Basel, 4056, SWITZERLAND.

Nanometer-scale structures with high aspect ratios such as nanowires and nanotubes combine low mechanical dissipation with high resonance frequencies, making them ideal force transducers and scanning probes in applications requiring the highest sensitivity. Such structures promise record force sensitivities combined with ease of use in scanning probe microscopes. A wide variety of possible material compositions and functionalizations is available, allowing for the sensing of various kinds of forces. Read More

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http://dx.doi.org/10.1088/1361-6528/ab19cfDOI Listing

Regioregularity and deposition effect on the physical/chemical properties of polythiophene derivatives films.

Nanotechnology 2019 Apr 16. Epub 2019 Apr 16.

Universidade Estadual Paulista Julio de Mesquita Filho - Campus de Presidente Prudente, Presidente Prudente, SP, BRAZIL.

Polythiophene thin films are widely studied for applications in organic electronics. However, some comparisons are still missing, regarding distinct deposition techniques and regioregularity. Here regioregular and regiorandom alkyl-substituted polythiophene derivatives (P3ATs) were deposited on solid substrates using both Langmuir-Blodgett (LB) and Langmuir-Schaefer (LS) techniques. Read More

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http://dx.doi.org/10.1088/1361-6528/ab19f0DOI Listing
April 2019
1 Read

One-dimensional architecture with reduced graphene oxide supporting ultrathin MoO2 nanosheets as high performance anode for lithium-Ion Batteries.

Authors:
Yanqi Feng Hui Liu

Nanotechnology 2019 Apr 16. Epub 2019 Apr 16.

School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi, CHINA.

Two-dimensional (2D) materials have been widely studied and used as anode material for lithium ion battery because of their high specific surface areas and intrinsic mechanical flexibility which could offer numerous active sites and protect effect for LIB. However, 2D nanosheets are easy to stack and partially losing surface area for Li-ion storage thus greatly affect their electrochemical performance. Here, we develop a simple strategy to obtain nanosheets-based one-dimensional structure hybrid by in-situ reduction from MoO3 nanorods to MoO2 nanosheets and nanoparticles which anchored on 1D graphene skeleton (MoO2-rGO). Read More

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http://dx.doi.org/10.1088/1361-6528/ab19e0DOI Listing

Layer-by-layer assembly of metal-organic framework nanosheets with polymer.

Nanotechnology 2019 Apr 16. Epub 2019 Apr 16.

National Energy Technology Laboratory, Pittsburgh, Pennsylvania, UNITED STATES.

Metal-organic framework (MOF) nanosheets are attracting more and more attention due to their tunable porous structure and two-dimensional shape. Adding MOF nanosheets into polymers can lead to improved properties, but the level of enhancement is usually thwarted by the difficulties in exfoliating and aligning these nanosheets within the polymer matrix. In order to establish a strategy for making polymer/MOF nanosheets composites with improved exfoliation and alignment, we combined MOF nanosheets and polymer using layer-by-layer assembly for the first time. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab19f4
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http://dx.doi.org/10.1088/1361-6528/ab19f4DOI Listing
April 2019
2 Reads

Magnetic field-assisted selective delivery of doxorubicin to cancer cells using magnetoliposomes as drug nanocarriers.

Nanotechnology 2019 Apr 16. Epub 2019 Apr 16.

Warsaw University of Technology Faculty of Chemistry, Warsaw, 00-664, POLAND.

Magnetoliposomes are promising candidates for the development of selective drug delivery systems in the treatment of cancer. Those nanosystems were tested as carriers of a strong chemotherapeutic agent, doxorubicin, which is used against breast cancer. Herein, the magnetic properties of hydrophobic iron oxide nanoparticles located exclusively in the lipid bilayer were used to release this drug from the magnetoliposomes. Read More

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http://dx.doi.org/10.1088/1361-6528/ab19d3DOI Listing

Fluid surface coatings for solid-state nanopores: comparison of phospholipid bilayers and archaea-Inspired lipid monolayers.

Nanotechnology 2019 Apr 16. Epub 2019 Apr 16.

Universite de Fribourg Adolphe Merkle Institute, Fribourg, SWITZERLAND.

In the context of sensing and characterizing single proteins with synthetic nanopores, lipid bilayer coatings provide at least four benefits: First, they minimize unwanted protein adhesion to the pore walls by exposing a zwitterionic, fluid surface. Second, they can slow down protein translocation and rotation by the opportunity to tether proteins with a lipid anchor to the fluid bilayer coating. Third, they provide the possibility to impart analyte specificity by including lipid anchors with a specific receptor or ligand in the coating. Read More

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http://dx.doi.org/10.1088/1361-6528/ab19e6DOI Listing
April 2019
1 Read

Core/Shell Copper Nanowire Networks for Transparent Thin Film Heaters.

Nanotechnology 2019 Apr 16. Epub 2019 Apr 16.

Department of Metallurgical and Materials Engineering, Middle East Technical University, Inonu Bulvari, 06531 Ankara, Ankara, TURKEY.

Copper nanowires (Cu NWs) appear as the strongest alternative to silver nanowires (Ag NWs) in transparent conductors. Cu NWs; however, are more prone to oxidation than Ag NWs even at room temperature. This problem becomes more severe when Cu NWs are used as transparent thin film heaters (TTFHs). Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab19c6
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http://dx.doi.org/10.1088/1361-6528/ab19c6DOI Listing
April 2019
2 Reads

Controlled one-sided growth of Janus TiO2/MnO2 nanomotors.

Nanotechnology 2019 Apr 16. Epub 2019 Apr 16.

Zhejiang Sci-Tech University, Hangzhou, 310018, CHINA.

Designing and building new micro/nanomotors are among the most exciting challenges facing nanotechnology. Considering the expensive equipment and the high cost associated with noble metals, scalable and reliable fabrication method is desired in fabrication of Janus particles. In this work, we report preparation and characterization of self-propelled micromotors based on Janus TiO2/MnO2 nanoparticles. Read More

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http://dx.doi.org/10.1088/1361-6528/ab19c7DOI Listing
April 2019
4 Reads

Tin oxide artificial synapses for low power temporal information processing.

Nanotechnology 2019 Apr 16. Epub 2019 Apr 16.

School of Science, RMIT University, Melbourne, Victoria, AUSTRALIA.

Lateral memristors configured with inert Pt contacts and mixed phase tin oxide layers have exhibited immediate, forming-free, low-power bidirectional resistance switching. Activity dependent conductance and relaxation in the low resistance state resembled short term potentiation in biological synapses. After scanning probe microscopy, X-ray photoelectron spectroscopy and electrical measurements, the device characteristics were attributed to Joule heating induced decomposition of the minority SnO phase and formation of a SnO2 conducting filament with higher effective n-type doping. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab19c9
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http://dx.doi.org/10.1088/1361-6528/ab19c9DOI Listing
April 2019
5 Reads

Enhanced carrier transport over grain boundaries in lead-free CH3NH3Sn(I1-xBrx)3 (0 ≤ x ≤ 1) perovskite solar cells.

Nanotechnology 2019 Apr 16. Epub 2019 Apr 16.

Ewha Womans University, Seoul, Korea (the Republic of).

This paper reports on grain boundary (GB) roles in lead-free tin halide perovskite thin films. Nano scale spatial mapping of charge separation efficiency in methylammonium tin halides (MASn(I<sub>1-x</sub>Br<sub>x</sub>)<sub>3</sub>, MA = CH<sub>3</sub>NH<sub>3</sub>) thin films were constructed by Kelvin probe force microscopy (KPFM) and conductive atomic force microscopy (C-AFM). We observed downward band bending at GBs under dark conditions and higher surface photovoltage along the GBs, confirmed by C-AFM which showed high local current flows along the GBs. Read More

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http://dx.doi.org/10.1088/1361-6528/ab19ddDOI Listing

Role of hole trapping in the unintentionally doped (UID)-GaN layer in suppressing the two-dimensional electron gas (2DEG) degradation in AlGaN/GaN heterostructures on Si.

Nanotechnology 2019 Apr 15. Epub 2019 Apr 15.

Beijing University of Posts and Telecommunications, Beijing, CHINA.

We identify the spatially resolved trapping mechanism and clarify the role of the unintentionally doped (UID) GaN layer in suppressing the two-dimensional electron gas (2DEG) degradation in AlGaN/GaN heterostructures on Si. The trapping mechanism is characterized by measuring C-V dispersion after three different configurations of bias stress: high drain-substrate voltage stress, high drain-gate voltage stress and combined stress (with both high drain-gate voltage and drain-substrate voltage stress). Under the combined stress, the 2DEG degradation is the overall effect of electron trapping and hole trapping. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1948DOI Listing

Position-controlled laser-induced creation of rutile TiO2 nanostructures.

Nanotechnology 2019 Apr 15. Epub 2019 Apr 15.

Dept. of Physics, University of Konstanz, Konstanz, Baden-Württemberg, GERMANY.

For potential applications of nanostructures the control over their position is important. In this report, we introduce two continues wave laser-based lithography techniques which allow texturing thin TiO2 films to create a fine rutile TiO2 structure on silicon via spatially confined oxidation or a solid-liquid-solid phase transition. As initial layers, we use titanium and anatase TiO2, respectively. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1964DOI Listing
April 2019
1 Read

Detection of ultra-low protein concentrations with the simplest possible field effect transistor.

Nanotechnology 2019 Apr 15. Epub 2019 Apr 15.

Department of Chemistry, University College Cork, Western Road, Cork, Cork, IRELAND.

Silicon nanowire (Si NW) sensors have attracted great attention due to their ability to provide fast, low-cost, label-free, real-time detection of chemical and biological species. Usually configured as field effect transistors (FETs), they have already demonstrated remarkable sensitivity with high selectivity (through appropriate functionalisation) towards a large number of analytes in both liquid and gas phases. Despite these excellent results, Si NW FET sensors have not yet been successfully employed to detect single molecules of either a chemical or biological target species. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab192c
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http://dx.doi.org/10.1088/1361-6528/ab192cDOI Listing
April 2019
1 Read

Hot spot formation in focused-ion-beam-fabricated YBa2Cu3O7-x (YBCO) nanobridges with high critical current densities.

Nanotechnology 2019 Apr 15. Epub 2019 Apr 15.

Materials Science and Engineering, CSIRO , PO Box 218, Lindfield, New South Wales 2070, Sydney, New South Wales, 2070, AUSTRALIA.

We report on the fabrication and evaluation of nanoscale YBCO constrictions using focused-ion-beam (FIB) techniques for potential application as YBCO bolometers. A gold protective layer was found to be critical for supressing contamination from gallium ions in order to obtain high critical current densities. Further processing using a radio-frequency plasma to remove the gold protective layer has also been studied and was found to be effective in minimizing sample damage resulting from overheating. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1971DOI Listing

Boron ink assisted in-situ boron nitride coatings for anti-oxidation and anti-corrosion applications.

Nanotechnology 2019 Apr 15. Epub 2019 Apr 15.

City University of Hong Kong, Kowloon, HONG KONG.

Graphene, as a coating material, which shows high impermeability as an excellent barrier in oxidation and corrosion protection, has been reported to be less stable at elevated temperature. Meanwhile, sometimes the formed galvanic cell between graphene and protective surface will even increase corrosion speed. In comparison, boron nitride (BN), which shows the same impermeability with graphene, is believed to be a better coating material with its superior thermal and chemical inertness. Read More

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http://dx.doi.org/10.1088/1361-6528/ab193cDOI Listing
April 2019
3.821 Impact Factor

Reversibly tuning the surface state of Ag via the assistance of photocatalysis in Ag/BiOCl.

Nanotechnology 2019 Apr 15. Epub 2019 Apr 15.

Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, UNITED STATES.

Silver (Ag) nanoparticles can be spontaneously oxidized and present in different oxidized surface phases. The impact of oxidation induced photo absorption property and related photocatalytic activity are still unclear in Ag-decorated semiconductor photocatalysts. Herein, Ag-decorated BiOCl with the metallic Ag0 to oxidized Ag+ were employed to investigate the effect of surface state of Ag on relative photocatalyst properties. Read More

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http://dx.doi.org/10.1088/1361-6528/ab192eDOI Listing

Self-powered diamond ultraviolet photodetector with a transparent Ag nanowire electrode.

Nanotechnology 2019 Apr 12. Epub 2019 Apr 12.

Xi'an Jiaotong University, Xi'an, Shaanxi, CHINA.

A novel diamond UV photodetector with a transparent Ag nanowire (NW) electrode was fabricated. Transparent Ag NW network was spin-coated on single crystalline diamond to form Schottky contact, which had a barrier height of about 1.37 eV obtained by XPS measurements. Read More

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http://dx.doi.org/10.1088/1361-6528/ab18c2DOI Listing
April 2019
2 Reads

Solution-processed metal-oxide thin-film transistors: a review of recent developments.

Nanotechnology 2019 Apr 11. Epub 2019 Apr 11.

State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Wushan Road 381#, Guangzhou, Guangdong, 510640, CHINA.

Driven by the rapid development of novel active-matrix displays, thin-film transistors (TFTs) based on metal-oxide (MO) semiconductors have drawn great attention during recent years. N-type MO TFTs manufactured through vacuum-based processes have the advantages of higher mobility compared to the amorphous silicon TFTs, better uniformity and lower processing temperature compared to the polysilicon TFTs, visible light transparency which is suitable for transparent electronic devices, etc. However, the fabrication cost is high owing to the expensive and complicated vacuum-based systems. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1860DOI Listing
April 2019
1 Read

Controlling the growth of single crystal ZnO nanowires by tuning the atomic layer deposition parameters of the ZnO seed layer.

Nanotechnology 2019 Apr 11. Epub 2019 Apr 11.

Department of Physics, Durham University, South Road, Durham, DH1 3LE, Durham, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND.

Semiconducting nanowires (NWs) offer exciting prospects for a wide range of technological applications. The translation of NW science into technology requires reliable high-quality large volume production. This study provides an in-depth investigation of the parameters using an atomic layer deposition (ALD) system to grow zinc oxide (ZnO) seed layers followed by the chemical bath deposition of ZnO nanowires (NWs) to demonstrate the low-cost production of uniform single crystal wurtzite phase ZnO NWs that is scalable to large area substrates. Read More

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http://dx.doi.org/10.1088/1361-6528/ab186aDOI Listing

Defect influence on in-plane photocurrent of InAs/InGaAs quantum dot array: long-term electron trapping and Coulomb screening.

Nanotechnology 2019 Apr 11. Epub 2019 Apr 11.

Shenzhen University, Shenzhen, Guangdong, CHINA.

Metamorphic InAs/In<sub>0.15</sub>Ga<sub>0.85</sub>As and InAs/In<sub>0. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1866DOI Listing

Fabrication of gold-silver core-shell nanoparticles for performing as ultrabright SERS-nanotags inside human ovarian cancer cells.

Nanotechnology 2019 Apr 11. Epub 2019 Apr 11.

Molecular Spectroscopy Department Nanobiophotonics Center Faculty of Physics, Babes-Bolyai University of Cluj-Napoca, Str Mihail Kogslniceanu Nr 1, 400084 Cluj-Napoca, Cluj-Napoca, ROMANIA.

This paper presents the fabrication and characterization of new gold-silver core-shell nanoparticles labeled with para-mercaptobenzoic acid (4MBA) molecules and demonstrates their use as SERS-nanotags with ultra-bright traceability inside cells and ability to convey spectrally-coded information about the intracellular pH by means of Surface-Enhanced Raman Spectroscopy (SERS). Unlike to previous reported studies, our fabrication procedure includes in the first step the synthesis of chitosan-coated gold nanoparticles as a seed material with subsequent growing of a silver shell. The bimetallic core-shell structure is revealed by transmission electron microscopy (TEM), high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM), energy-dispersive X-ray elemental mapping (EDX) and the presence of two interacting localized surface plasmon resonance (LSPR) modes in UV-Vis extinction spectrum. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1857DOI Listing

Process-dependent mechanical and optical properties of nanostructured silicon carbonitride thin films.

Nanotechnology 2019 Apr 10. Epub 2019 Apr 10.

Department of Engineering Physics , McMaster University, Hamilton, Ontario, CANADA.

Abstract Amorphous hydrogenated silicon carbonitride (a-SiCN:H) thin films were grown using electron cyclotron resonance chemical vapour deposition using a mixture of methane, nitrogen, and silane as precursors. The origin of the variation of macroscopic properties such as nanohardness (H), elastic modulus (E), photoluminescence (PL), and the optical band gap was investigated through their correlation with the microscopic features of a-SiCN:H thin films as a function of the process parameters, including the deposition temperature and methane gas flow rate. From a microstructural perspective, the thin films were investigated using X-ray photoelectron spectroscopy (XPS), Rutherford backscattering spectrometry (RBS), elastic recoil detection (ERD), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab180c
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http://dx.doi.org/10.1088/1361-6528/ab180cDOI Listing
April 2019
2 Reads

Microstructural engineering in interface-type synapse device for enhancing linear and symmetric conductance changes.

Nanotechnology 2019 Apr 10. Epub 2019 Apr 10.

Kwangwoon University, Nowon-gu, 01897, Korea (the Republic of).

The origins of the nonlinear and asymmetric synaptic characteristics of TiOx-based synapse devices were investigated. Based on the origins, a microstructural electrode was utilized to improve the synaptic characteristics. Under an identical pulse bias, a TiOx-based synapse device exhibited saturated conductance changes, which led to nonlinear and asymmetric synaptic characteristics. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab180f
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http://dx.doi.org/10.1088/1361-6528/ab180fDOI Listing
April 2019
3 Reads

Carbon framework microbelt supporting SnOx as high performance electrode for lithium ion batteries.

Nanotechnology 2019 Apr 10. Epub 2019 Apr 10.

Department of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, Henan, CHINA.

Facile preparation of rational SnOx-based materials electrode materials with excellent electrochemical performance is highly desired for lithium ion batteries. In this work, carbon framework microbelt supporting SnOx nanoparticles (CFM-SnOx) was prepared via a facile electrospinning technology and annealing treatment process. The as-synthesized CFM-SnOx electrode exhibits high reversible capacity of 768 mAh g-1 at 0. Read More

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http://dx.doi.org/10.1088/1361-6528/ab17f4DOI Listing
April 2019
3 Reads

Surface plasmon assisted laser ablation of stainless steel.

Nanotechnology 2019 Apr 10. Epub 2019 Apr 10.

Department of Physics and Astronomy, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA, UNITED STATES.

Colloidal Au nanoparticles (NPs) were decorated on stainless steel for surface plasmon enhanced laser ablation. A comparative study of the laser ablation efficiency was carried out on stainless steel samples with and without the Au NPs decoration at a variable pulsed laser fluence and laser pulse number. Higher ablation efficiency was clearly demonstrated in the former as illustrated from the larger diameter, maximum depth and the cross-sectional area of the crater generated by the laser ablation under the same conditions. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1806DOI Listing

TiO2 nanopillar arrays coated with gelatin film for efficient capture and undamaged release of circulating tumor cells.

Nanotechnology 2019 Apr 9. Epub 2019 Apr 9.

Department of Physics and Center of Nanoscience and Nanotechnology Research, Wuhan University, Wuhan, Hubei 430072, PEOPLE'S REPUBLIC OF CHINA, WhuHan, HuBei, 430072, CHINA.

Circulating tumor cells (CTC) are important for the detection and treatment of cancer. Nevertheless, the badly low density of circulating tumor cells makes the capture and release of CTCs an obstacle. In this work, TiO2 nanopillar arrays coated with gelatin film was synthesized for efficient capture and undamaged release of circulating tumor cells. Read More

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http://dx.doi.org/10.1088/1361-6528/ab176cDOI Listing
April 2019
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3.821 Impact Factor

Thermally enhanced optical contrast of graphene oxide for thickness identification.

Nanotechnology 2019 Apr 9. Epub 2019 Apr 9.

Southeast University, Nanjing, Jiangsu, CHINA.

We present a simple, but rapid and accurate approach to identify the layer number of graphene oxide (GO) by using its thermally enhanced optical contrast via vacuum heating. As expected, changes have been observed both in the thicknesses and chemical structures of the material upon the thermal treatment, which can be attributed to the reduction of the amount of intercalated water and oxygen content. This results in the increase of refractive index and absorption coefficient approaching to the values for intrinsic graphene. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab1780
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http://dx.doi.org/10.1088/1361-6528/ab1780DOI Listing
April 2019
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Electrospun Fe2C-loaded carbon nanofibers as efficient electrocatalysts for oxygen reduction reaction.

Nanotechnology 2019 Apr 9. Epub 2019 Apr 9.

College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, China, Beijing, 100029, CHINA.

Electrospinning; Nanofibers; Inorganic; Electrocatalyst; Oxygen reduction reaction. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1777DOI Listing
April 2019
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Correlated optical and structural analyses of individual GaAsP/GaP core-shell nanowires.

Nanotechnology 2019 Apr 9. Epub 2019 Apr 9.

Centre de Nanoscience et de Nanotechnologies, Palaiseau, Ile-de-France, FRANCE.

We report on the structural and optical properties of GaAs<sub>0.7</sub>P<sub>0.3</sub>/GaP core-shell nanowires (NWs) for future photovoltaic applications. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1760DOI Listing
April 2019
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Noise spectroscopy to study the 1D electron transport properties in InAs nanowires.

Nanotechnology 2019 Apr 9. Epub 2019 Apr 9.

Bioelectronics (ICS-8), Forschungszentrum Juelich, D-52425, Juelich, Juelich, 52425, GERMANY.

InAs nanowires (NWs) are recognized as key materials due to their unique transport properties. Despite remarkable progress in designing InAs NW device structures, there are still open questions on device variability. Here, we demonstrate that noise spectroscopy allows us to study not only the parameters of traps, but also to shed light on quantum transport in NW structures. Read More

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http://dx.doi.org/10.1088/1361-6528/ab175eDOI Listing

Design of Nanorobots for Exposing Cancer Cells.

Nanotechnology 2019 Apr 9. Epub 2019 Apr 9.

Ilse Katz Institute of Nano-Scale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva, Southern, ISRAEL.

We discuss in detail, the design of a nanorobot which can navigate, detect cancer cells in the blood and actuate the exposure of drugs. The nanorobot is designed with blood energy harvesting capability and the accumulation of electricity in a capacitor, that forms the main body of the nanorobot. Glucose hunger-based cancer detectors immobilized on a carbon nanotube (CNT) sensor, reduces its electrical resistance, when attached to a cancer cell. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1770DOI Listing
April 2019
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Anisotropic deformation of NiO nanoparticles embedded in silica under swift heavy ion irradiation.

Nanotechnology 2019 Apr 9. Epub 2019 Apr 9.

Utrecht University Debye Institute for Nanomaterial(s) Science, Utrecht, Utrecht, NETHERLANDS.

We report on the ion-induced anisotropic deformation in nickel-oxide nanoparticles prepared by conventional sol-gel technique. Colloidal-like NiO nanoparticles with an average diameter of about 40-50 nm embedded in a SiO2 layer change their shape dramatically under swift heavy ion irradiation with 32 MeV Cu+5 ions at room temperature and normal incidence. Transmission electron microscopy analysis show irradiation induced shape transformation from nearly spherical nanoparticles into oblate nanorods at a rate that increases with ion fluence. Read More

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http://dx.doi.org/10.1088/1361-6528/ab176fDOI Listing

Nanovesicle-based formulations for photoprotection: a safety and efficacy approach.

Nanotechnology 2019 Apr 9. Epub 2019 Apr 9.

UFRJ, Rio de Janeiro, BRAZIL.

Vesicular nanosystems are versatile and they are able to encapsulate actives with different solubilities, such as lipophilic and hydrophilic compounds. The most well-known vesicular nanosystems are liposomes and niosomes, the last one is formed by non-ionic surfactants. In the present work, it was developed photoprotective niosomes containing sunscreens (octyl methoxycinnamate, diethylamino hydroxybenzoyl hexyl benzoate and phenylbenzimidazole sulfonic acid), non-ionic surfactants, cholesterol and stearylamine (positive-charged lipid). Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab177c
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http://dx.doi.org/10.1088/1361-6528/ab177cDOI Listing
April 2019
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Bifunctional Oxygen Evolution and Supercapacitor Electrode with Integrated Architecture of NiFe-LDH and Hierarchical Carbon Framework.

Nanotechnology 2019 Apr 9. Epub 2019 Apr 9.

MOE Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, CQU-NUS Renewable Energy Materials & Devices Joint Laboratory, School of Energy & Power Engineering, Chongqing University,, Chongqing, CHINA.

Layered double hydroxide with exchangeable interlayer anions is considered as promising electro-active materials for renewable energy technologies. However, the limited exposure of active sites and poor electrical conductivity of hydroxide powder restrict its application. Herein, bifunctional integrated electrode with a 3D hierarchical carbon framework decorated by nickel iron layered double hydroxides (NiFe-LDH) is developed. Read More

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http://dx.doi.org/10.1088/1361-6528/ab178cDOI Listing
April 2019
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Bimetallic Pt-Pd nano-catalyst: size, shape and composition matter.

Nanotechnology 2019 Apr 9. Epub 2019 Apr 9.

University of Arkansas at Little Rock, Little Rock, Arkansas, UNITED STATES.

The goal of this work is to understand how the phase diagram of the platinum-palladium (Pt-Pd) alloy changes with size and shape and how it correlates with catalytic properties. By using nano-thermodynamics, the size and shape effects on the phase diagram of Pt-Pd nanoparticles were determined theoretically. The phase diagram of some nanoparticles (sphere, tetrahedron, octahedron, decahedron, cube, cuboctahedron and rhombic dodecahedron) exhibits a congruent melting point that becomes more and more pronounced when the size decreases. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1759DOI Listing

Study of field emission property of pure graphene-CNT heterostructure connected via seamless interface.

Nanotechnology 2019 Apr 9. Epub 2019 Apr 9.

Nanostructured Device, Sensors and Diagnostic , Institute of Nano Science and Technology, Habitat Centre, Phase-10, Sector-64, Mohali, Mohali, 160062, INDIA.

The vertically aligned Carbon Nanotubes have proved to be one of the best material as an efficient field emitter. To further improve its efficiency as well as long-term use in practical devices, it is involuntary to reduce the quantum resistance originating due to interface between electrode and emitters and the entanglement of the CNTs in bundle texture. Thus incorporation of graphene at the bottom of CNT bundles via seamless carbonaceous interface can easily solve this bottleneck. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab1774
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http://dx.doi.org/10.1088/1361-6528/ab1774DOI Listing
April 2019
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3D nano-bridge-based SQUID susceptometers for scanning magnetic imaging of quantum materials.

Nanotechnology 2019 Apr 9. Epub 2019 Apr 9.

Fudan University, Shanghai, Shanghai, CHINA.

We designed and fabricated a new type of superconducting quantum interference device (SQUID) susceptometers for magnetic imaging of quantum materials. The 2-junction SQUID sensors employ 3D Nb nano-bridges fabricated using electron beam lithography. The two counter-wound balanced pickup loops of the SQUID enable gradiometric measurement and they are surrounded by a one-turn field coil for susceptibility measurements. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1792DOI Listing
April 2019
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3.821 Impact Factor

Bimetallic silver-platinum nanoparticles with combined osteo-promotive and antimicrobial activity.

Nanotechnology 2019 Apr 8. Epub 2019 Apr 8.

Surgical Research, BG University Hospital Bergmannsheil, Bochum, Nordrhein-Westfalen, GERMANY.

Bimetallic alloyed silver-platinum nanoparticles (AgPt NP) with different metal composition from Ag<sub>10</sub>Pt<sub>90</sub> to Ag<sub>90</sub>Pt<sub>10</sub> in steps of 20 mol% were synthesized. The biological effects of AgPt NP, including cellular uptake, cell viability, osteogenic differentiation and osteoclastogenesis as well as the antimicrobial activity towards <i>Staphylococcus aureus</i> and <i>Escherichia coli</i> were analyzed in comparison to pure Ag NP and pure Pt NP. The uptake of NP into human mesenchymal stem cells was confirmed by cross-sectional focused-ion beam preparation and observation by scanning and transmission electron microscopy in combination with energy-dispersive X-ray analysis. Read More

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http://dx.doi.org/10.1088/1361-6528/ab172bDOI Listing

Altering the radiation chemistry of electron-beam lithography with a reactive gas: a study of Teflon AF patterning under water vapor.

Nanotechnology 2019 Apr 8. Epub 2019 Apr 8.

Electrical and Computer Engineering, University of Kentucky, Lexington, Kentucky, UNITED STATES.

Variable-pressure electron-beam lithography (VP-EBL) employs an ambient gas at subatmospheric pressure to reduce charging of insulating films and substrates during electron exposure. In this work, VP-EBL proves to beam efficient method for patterning a widely used, but challenging to process, fluoropolymer, Teflon AF. However, rather than solely mitigating charging, the ambient gas is found to alter the radiation chemistry of the exposure process. Read More

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http://dx.doi.org/10.1088/1361-6528/ab16f7DOI Listing
April 2019
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Gigahertz acoustic vibrations of Ga-doped ZnO nanoparticle array.

Nanotechnology 2019 Apr 8. Epub 2019 Apr 8.

State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, 1037 Luo Yu Road, Wuhan, Hubei 430074, Wuhan, CHINA.

In this work, we present an experimental study on the acoustic vibrations of ZnO nanoparticles array with different concentration of Ga dopings by using femtosecond pump-probe technique. The Ga-doped ZnO (GZO) nano-triangle particles with the sizes of 190 nm, 232 nm and 348 nm are fabricated by nanosphere lithography (NSL) and pulsed laser deposition (PLD) method. The result indicates that the frequency of acoustic vibrations of GZO nanoparticles decrease as the Ga-concentration is increased. Read More

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http://iopscience.iop.org/article/10.1088/1361-6528/ab1739
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http://dx.doi.org/10.1088/1361-6528/ab1739DOI Listing
April 2019
2 Reads