14,643 results match your criteria Nanoscale[Journal]


High-speed imaging and tracking of very small single nanoparticles by contrast enhanced microscopy.

Nanoscale 2018 Dec 14. Epub 2018 Dec 14.

Institute of Atomic and Molecular Sciences (IAMS), Academia Sinica, 10617 Taipei, Taiwan.

Nanoparticles have been used extensively in biology-related research and many applications require direct visualization of individual nanoparticles by optical microscopy. For long-term and high-speed measurements, scattering-based microscopy is a unique technique because of the stable and indefinite scattering signals. In scattering-based single-particle measurements, large nanoparticles are usually needed in order to generate sufficient signals for detection. Read More

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December 2018

Intracellular targeted delivery of quantum dots with extraordinary performance enabled by a novel nanomaterial design.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of Biomedical Engineering, College of Engineering and Applied Sciences, Nanjing University, China. and Institute of Materials Engineering, College of Engineering and Applied Sciences, Nanjing University, China and Collaborative Innovation Center of Chemistry for Life Sciences, Nanjing University, China.

Quantum dots (QDs) have emerged as a major class of fluorescent probes with unique optical properties, but applying QDs for imaging specific intracellular entities in live cells has been hindered by the poor performance of targeted intracellular delivery of QDs due to various cellular transport barriers. We describe a novel QD nanoprobe design, which is termed a cosolvent-bare hydrophobic QD-biomolecule (cS-bQD-BM, or 'SDot' for short), combining a cosolvent, a bare hydrophobic nanoparticle surface, ultrasmall size and biomolecular function. SDots show extraordinary intracellular targeting performance with the nucleus as the model target, including near-perfect specificity, excellent efficiency and reproducibility, high-throughput ability, minimal toxicity, and ease of operation, as well as superb optical properties and colloidal stability. Read More

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December 2018

Bio-interfactants as double-sided tapes for graphene oxide.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

University of Bremen, Hybrid Materials Interfaces Group, Faculty of Production Engineering, Center for Environmental Research and Sustainable Technology (UFT), and MAPEX Center for Materials and Processes, D-28359 Bremen, Germany.

We present a versatile and highly substrate-independent approach for preparing multisandwich layers based on thermally reduced Graphene Oxide (rGO) which gets strongly attached by bio-interfactants using a layer-by-layer (LBL) aqueous dipping and rinsing process. The process allows for the deposition of homogeneous ultra-thin films (∼5.5 nm) in distinct surface topographies, thicknesses and compositions by varying the bio-interfactant layer(s). Read More

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December 2018
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A liquid metal-based self-adaptive sulfur-gallium composite for long-cycling lithium-sulfur batteries.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science & Engineering Beihang University, Beijing, 100191, China.

Lithium-sulfur (Li-S) batteries have been regarded as a promising candidate for energy storage owing to their ultrahigh theoretical capacity and low cost. However, the commercial application of Li-S batteries has been plagued by the huge volume change of sulfur, the insulative nature of solid active materials (S and Li2S) and the polysulfide shuttle. Here, a uniform sulfur-gallium core-shell structure (S@Ga) with an ultrathin liquid gallium shell was prepared by harnessing the reaction between sulfur and gallium via a facile mixing process. Read More

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December 2018

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Nanoscale 2018 Dec;10(48):23201

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December 2018
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Enhancing charge transfer with foreign molecules through femtosecond laser induced MoS defect sites for photoluminescence control and SERS enhancement.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, USA.

Defect/active site control is crucial for tuning the chemical, optical, and electronic properties of MoS2, which can adjust the performance of MoS2 in application areas such as electronics, optics, catalysis, and molecular sensing. This study presents an effective method of inducing defect/active sites, including micro/nanofractured structures and S atomic vacancies, on monolayer MoS2 flakes by using femtosecond laser pulses, through which physical-chemical adsorption and charge transfer between foreign molecules (O2 or R6G molecules) and MoS2 are enhanced. The enhanced charge transfer between foreign molecules (O2 or R6G) and femtosecond laser-treated MoS2 can enhance the electronic doping effect between them, hence resulting in a photoluminescence photon energy shift (reaching 0. Read More

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December 2018

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Nanoscale 2018 Dec;10(48):23202

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December 2018
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High-performance sub-10 nm monolayer BiOSe transistors.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China. and Collaborative Innovation Center of Quantum Matter, Beijing 100871, P. R. China.

A successful two-dimensional (2D) semiconductor successor of silicon for high-performance logic in the post-silicon era should have both excellent performance and air stability. However, air-stable 2D semiconductors with high performance were quite elusive until the air-stable Bi2O2Se with high electron mobility was fabricated very recently (J. Wu, H. Read More

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December 2018
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Modulated interlayer charge transfer dynamics in a monolayer TMD/metal junction.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Research School of Engineering, College of Engineering and Computer Science, the Australian National University, Canberra, ACT 2601, Australia.

The performance of optoelectronic devices based on monolayer transition-metal dichalcogenide (mTMD) semiconductors is significantly affected by the contact at the mTMD-metal interface, which is dependent on interlayer interactions and coupling. Here, we report a systematic optical method to investigate the interlayer charge transfer and coupling in a mTMD-metal heterojunction. Giant photoluminescence (PL) quenching was observed in a monolayer MoS2/Pd (1L MoS2/Pd) junction which is mainly due to the efficient interlayer charge transfer between Pd and MoS2. Read More

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December 2018

Surface versus solution chemistry: manipulating nanoparticle shape and composition through metal-thiolate interactions.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Indiana University, Department of Chemistry, 800 E. Kirkwood Ave., Bloomington, IN 47405, USA.

Nanostructures with well-defined crystallite sizes, shapes, and compositions are finding use in areas such as energy, security, and even medicine. Seeded growth is a promising strategy to achieve shape-controlled nanostructures, where specific structural features are often directed by the underlying symmetry of the seeds. Here, thiophenol derivatives capable of different metal-thiolate interactions were introduced into the synthesis of Au/Pd nanostructures by seed-mediated co-reduction. Read More

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December 2018
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[Tc-HYNIC-N-dodecylamide]: a new hydrophobic tracer for labelling reconstituted high-density lipoproteins (rHDL) for radioimaging.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Dept. of Physiology and Anatomy, University of North Texas Health Science Center, Fort Worth, TX 76107, USA.

Despite the widespread use of nanotechnology in radio-imaging applications, lipoprotein based delivery systems have received only limited attention so far. These studies involve the synthesis of a novel hydrophobic radio-imaging tracer consisting of a hydrazinonicotinic acid (HYNIC)-N-dodecylamide and 99mTc conjugate that can be encapsulated into rHDL nanoparticles (NPs). These rHDL NPs can selectively target the Scavenger Receptor type B1 (SR-B1) that is overexpressed on most cancer cells due to excess demand for cholesterol for membrane biogenesis and thus can target tumors in vivo. Read More

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December 2018
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A self-assembly study of PNA-porphyrin and PNA-BODIPY hybrids in mixed solvent systems.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of Chemistry, University of Crete, Laboratory of Bioinorganic Chemistry, Voutes Campus, 70013 Heraklion, Crete, Greece.

In this work a peptide nucleic acid (PNA) was covalently connected with two different chromophores, namely porphyrin and boron-dipyrromethene. To the best of our knowledge, this is the first example in the literature where a PNA unit is covalently linked to such chromophores. The self-assembly properties of the hybrids were examined through electron microscopy experiments by adopting the "good-bad" solvent self-assembly protocol. Read More

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December 2018

High-performance gas sensors based on single-wall carbon nanotube random networks for the detection of nitric oxide down to the ppb-level.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of Electronic Materials Engineering, Kwangwoon University, Seoul 139-701, Republic of Korea.

We demonstrate highly sensitive and selective gas sensors based on solution-processed single-wall carbon nanotube (SWCNT) random networks for the detection of nitric oxide (NO) down to the ppb-level operating at room temperature. The proposed gas sensors exhibited a response of 50% under both inert and air atmospheres with a theoretical detection limit of 0.2 ppb and a selectivity toward different target gases of volatile organic compounds, including benzene, toluene, and ammonia. Read More

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December 2018
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Strain in a single wrinkle on an MoS flake for in-plane realignment of band structure for enhanced photo-response.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of Chemical Engineering, University of Illinois at Chicago, 810 South Clinton Street, Chicago, Illinois 60607, USA.

Since 2D transition metal dichalcogenides (TMDs) exhibit strain-tunable bandgaps, locally confining strain can allow lateral manipulation of their band structure, in-plane carrier transport and optical transitions. Herein, we show that a single wrinkle (width = 10 nm-10 μm) on an MoS2 flake can induce confined uniaxial strain to reduce the local bandgap (40-60 meV per % deformation), producing a microscopic exciton funnel with an enhancement in photocurrent over flat MoS2 devices. This study also shows that wrinkles can spatially reconfigure the distribution of dopants and enhance the light absorption in the MoS2 layer via Fabry-Perot interference in its nanocavity. Read More

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December 2018
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Rational design of ordered Pd-Pb nanocubes as highly active, selective and durable catalysts for solvent-free benzyl alcohol oxidation.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Hubei Nuclear Solid Physics Key Laboratory, Wuhan University, Wuhan 430072, China.

The selective oxidation of alcohols is an important chemical process with many potential applications in fine-chemical synthesis, however, the catalysts reported so far generally suffer from low activity and poor selectivity. We present here a class of ordered Pd3Pb nanocubes (NCs) with an intermetallic phase and well-defined surface as unique catalysts for selective oxidation of benzyl alcohol to benzaldehyde. The optimized Pd3Pb NCs exhibit both enhanced activity with the turnover frequency of 191 000 h-1 and excellent selectivity up to 91. Read More

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December 2018
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Understanding the formation of ultrathin mesoporous LiTiO nanosheets and their application in high-rate, long-life lithium-ion anodes.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA and Program of Materials Science and Engineering, University of California San Diego, La Jolla, CA 92093, USA.

Two-dimensional nanosheet-like materials with ultra-small thickness and uniform porous structures hold great promise for high-rate and long-life lithium-ion batteries. In this work, pure ultrathin mesoporous Li4Ti5O12 nanosheets are fabricated by combining a facile solvothermal synthesis with a calcination process. The detailed formation mechanism of ultrathin mesoporous Li4Ti5O12 nanosheets is systematically investigated, which identified the key factors that control the structure development. Read More

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December 2018
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Motion recognition by a liquid filled tubular triboelectric nanogenerator.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-Nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, P. R. China. and School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China and School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA.

The development of flexible electronics has extended the limit of the intelligent devices, which are highly sensitive, soft and capable of sustaining arbitrary deformation. Here, we report a liquid-polymer tubular triboelectric nanogenerator (L-P TENG) that is filled with liquid for a shape-adaptive sensor in various working modes. The L-P TENG is based on liquid-solid contact electrification with the use of displacement current and excited by the shape change of the tubular structure. Read More

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December 2018
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Back cover.

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Nanoscale 2018 Dec 13;10(48):23202. Epub 2018 Dec 13.

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December 2018
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Inside back cover.

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Nanoscale 2018 Dec 13;10(48):23201. Epub 2018 Dec 13.

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December 2018
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Contents list.

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Nanoscale 2018 Dec;10(48):22641-22656

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December 2018

Front cover.

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Nanoscale 2018 Dec;10(48):22639

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December 2018
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Nanoscale 2018 Dec;10(48):22640

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December 2018
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Structural stability and optical properties of two-dimensional perovskite-like CsPbBr microplates in response to pressure.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.

Here, we report the structural stability and visible light response of two-dimensional (2D) layered perovskite-like CsPb2Br5 microplates (MPs) under high pressure. In situ high-pressure emission, optical absorption, and angle dispersive synchrotron X-ray diffraction indicated that CsPb2Br5 MPs experienced an isostructural phase transformation at roughly 1.6 GPa. Read More

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December 2018
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A general and rapid room-temperature synthesis approach for metal sulphide nanocrystals with tunable properties.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, USA.

Colloidal metal sulphide (MS) nanocrystals (NCs) have recently attracted considerable attention because of their tunable properties that can be exploited in various physical, chemical and biological applications. In this work, we present a novel and general method for synthesis of monodispersed binary (CuS, Ag2S, CdS, PbS, and SnS), ternary (Ag-In-S, Cu-In-S and Cu-Sn-S) and quaternary (Cu-Zn-Sn-S) MS NCs. The synthesis is conducted at room temperature, with an immediate crystallization process and up to 60 seconds of growth time, enabling rapid synthesis without external heating. Read More

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December 2018
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Superior oxygen electrocatalysts derived from predesigned covalent organic polymers for zinc-air flow batteries.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, College of Chemical Engineering, College of Energy, Beijing University of Chemical Technology, Beijing, 100029, PR China.

Covalent organic polymers (COPs) as emerging porous materials with ultrahigh hydrothermal stability and well-defined and adjustable architectures have aroused great interest in the electrochemical field. Here, we reported a rational design approach for the preparation of a bifunctional electrocatalyst with the assistance of a predesigned bimetallic covalent organic polymer. With the predesigned nitrogen position and structural features of COP materials, the obtained CCOPTDP-FeNi-SiO2 catalyst affords a remarkable bifunctional performance with a positive half-wave potential (0. Read More

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December 2018

Localization and transient emission properties in InGaN/GaN quantum wells of different polarities within core-shell nanorods.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Japan. and Center for Integrated Research of Future Electronics (CIRFE), Nagoya University, Japan.

Transient photoluminescence (PL) characteristics and localization phenomena in InGaN/GaN core-shell nanorods (NRs) were investigated from 6 K up to 285 K. The NRs exhibit three well-defined PL bands in the near-UV, blue, and green range ascribed to the emission of quantum well (QW) areas situated at the (1.00) sidewalls, (10. Read More

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December 2018
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Passivation of the grain boundaries of CHNHPbI using carbon quantum dots for highly efficient perovskite solar cells with excellent environmental stability.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China. and Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

Organic-inorganic hybrid perovskites are prone to defect formation due to iodine and methylamine ion/defect migration, leading to the formation of lots of defects at the perovskite surface and grain boundaries. Passivation of the defects is an effective method to improve the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). To achieve stable passivation, the interaction between the perovskite and additive materials should be taken into consideration. Read More

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December 2018
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Enhanced design and formulation of nanoparticles for anti-biofilm drug delivery.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Department of Biomedical Engineering, University of Rochester, Rochester, New York, USA. and Center for Oral Biology, University of Rochester, Rochester, New York, USA and Center for Musculoskeletal Research, University of Rochester, Rochester, New York, USA and Department of Chemical Engineering, University of Rochester, Rochester, New York, USA.

Biofilms are surface-bound, structured microbial communities underpinning persistent bacterial infections. Biofilms often create acidic pH microenvironments, providing opportunities to leverage responsive drug delivery systems to improve antibacterial efficacy. Here, the antibacterial efficacy of novel formulations containing pH-responsive polymer nanoparticle carriers (NPCs) and farnesol, a hydrophobic antibacterial drug, were investigated. Read More

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December 2018

Scalable synthesis of a foam-like FeS nanostructure by a solution combustion-sulfurization process for high-capacity sodium-ion batteries.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Key Laboratory for Soft Chemistry and Functional Materials (Nanjing University of Science and Technology), Ministry of Education, Nanjing 210094, China.

Pyrite-type FeS2 is regarded as a promising anode material for sodium ion batteries. The synthesis of FeS2 in large quantities accompanied by an improved cycling stability, as well as retaining high theoretical capacity, is highly desirable for its commercialization. Herein, we present a scalable and simple strategy to prepare a foam-like FeS2 (F-FeS2) nanostructure by combining solution combustion synthesis and solid-state sulfurization. Read More

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December 2018
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In situ electron microscopy of the self-assembly of single-stranded DNA-functionalized Au nanoparticles in aqueous solution.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Department of Electrical & Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.

Solution-phase self-assembly of DNA-functionalized nanoparticles into mesoscale structures is a promising strategy for creating functional materials from nanocrystal building blocks. The predominant approach has been the use of Watson-Crick base pairing between complementary bases in designated 'sticky ends' to trigger programmable self-assembly into ordered superlattices. Here we demonstrate the ordered self-assembly of Au nanoparticles conjugated with single-stranded (ss) DNA in acidic solutions. Read More

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December 2018
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Microtubule self-healing and defect creation investigated by in-line force measurements during high-speed atomic force microscopy imaging.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Department of Physics, Nagoya University, Chikusa-ku, Furo-cho, 464-8602 Nagoya, Aichi, Japan. and Exploratory Research Center on Life and Living Systems, Higashiyama, Myodaiji, 444-8787 Okazaki, Aichi, Japan.

Microtubules are biopolymers composed of tubulin and play diverse roles in a wide variety of biological processes such as cell division, migration and intracellular transport in eukaryotic cells. To perform their functions, microtubules are mechanically stressed and, thereby, susceptible to structural defects. Local variations in mechanical properties caused by these defects modulate their biological functions, including binding and transportation of microtubule-associated proteins. Read More

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December 2018

Red emitting conjugated polymer based nanophotosensitizers for selectively targeted two-photon excitation imaging guided photodynamic therapy.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China.

Two-photon excitation (2PE) photodynamic therapy (PDT) is a non-invasive technique for the treatment of cancer. However, its clinical applications are limited by small two-photon absorption cross section values of conventional photosensitizers. Here we designed multifunctional conjugated polymer based nanoparticles consisting of a conjugated polymer, a photosensitizer and a red-emitting dye, which can realize simultaneous 2PE red emission imaging and 2PE-PDT activities. Read More

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December 2018
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Electrochemical exfoliation of graphene-like two-dimensional nanomaterials.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.

Unlike zero-dimensional quantum dots, one-dimensional nanowires/nanorods, and three-dimensional networks or even their bulk counterparts, the charge carriers in two-dimensional (2D) materials are confined along the thickness while being allowed to move along the plane. They have distinct characteristics like strong quantum confinement, tunable thickness, and high specific surface area, which makes them a promising candidate in a wide range of applications such as electronics, topological spintronic devices, energy storage, energy conversion, sensors, biomedicine, catalysis, and so on. After the discovery of the extraordinary properties of graphene, other graphene-like 2D materials have attracted a great deal of attention. Read More

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December 2018

From one-dimensional to two-dimensional wurtzite CuGaS nanocrystals: non-injection synthesis and photocatalytic evolution.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Science, Beijing JiaoTong University, Beijing 100044, China.

Multinary copper-based chalcogenides exhibit significant performance in photocatalytic hydrogen evolution due to their suitable optical bandgap for visible light absorption and environmentally friendly character. Herein, high-quality wurtzite CuGaS2 (CGS) nanocrystals (NCs) were synthesized by using a one-step heating-up process without any injection, and the morphology could be tuned from one-dimensional (1D) to two-dimensional (2D) by precise choice of surface ligands and gallium precursors. The formation mechanism of CGS NCs was studied comprehensively by means of the temporal-evolution of the morphology, crystal structure and optical absorption results. Read More

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December 2018

Controlled crystal facet of MAPbI perovskite for highly efficient and stable solar cell via nucleation modulation.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Hybrid Interface Materials Global Frontier Research Group, Pusan National University, Busan 46241, South Korea.

The crystallization of MAPbI3 perovskite films was purposefully engineered to investigate the governing factors which determine their morphological properties and moisture stability. By modulating nucleation, we obtained a single layer perovskite film with controlled crystal facet orientation and grain size. The lack of perovskite nucleation sites during crystallization allowed us to tailor the resulting crystallization phase. Read More

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December 2018

Carbon nanotube functionalization as a route to enhancing the electrical and mechanical properties of Cu-CNT composites.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Rd, CB3 0FS Cambridge, UK.

Copper-CNT (carbon nanotube) composite materials are promising alternatives to conventional conductors in applications ranging from interconnects in microelectronics to electrical cabling in aircraft and vehicles. Unfortunately, exploiting the full potential of these composites is difficult due to the poor Cu-CNT electro-mechanical interface. We demonstrate through large-scale ab initio calculations and sonication experiments that this problem can be addressed by CNT surface modification. Read More

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December 2018
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Nanostructuring mechanical cracks in a flexible conducting polymer thin film for ultra-sensitive vapor sensing.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Department of Physics, Indian Institute of Technology Madras, Chennai-600 036, India.

The swelling of electrically conducting polymer films upon absorption of vapors like alcohol or moisture is widely known. However, this swelling leads to feeble changes in charge transport characteristics. We demonstrate a colossal enhancement (from ∼6% to 108%) in the vapor-induced resistance change for a representative system, poly(3,4-ethylene dioxythiophene) polystyrene sulfonate (PEDOT:PSS). Read More

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December 2018
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Urchin-like NiO-NiCoO heterostructure microsphere catalysts for enhanced rechargeable non-aqueous Li-O batteries.

Nanoscale 2018 Dec 11. Epub 2018 Dec 11.

Integrated Composites Lab (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA.

Urchin-like NiO-NiCo2O4 microspheres with heterostructures were successfully synthesized through a facile hydrothermal method, followed by thermal treatment. The unique structure of NiO-NiCo2O4 with the synergetic effect between NiCo2O4 and NiO, and the heterostructure favour the catalytic activity towards Li-O2 batteries. NiCo2O4 is helpful for boosting both the oxygen reduction reaction and oxygen evolution reaction for the Li-O2 batteries and NiO is likely to promote the decomposition of certain by-products. Read More

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December 2018

Anisotropic nonvolatile magnetization controlled by electric field in amorphous SmCo thin films grown on (011)-cut PMN-PT substrates.

Nanoscale 2018 Dec 10. Epub 2018 Dec 10.

Beijing National Laboratory for Condensed Matter Physics and State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China and Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, P. R. China.

The tunable, nonvolatile electrical modulation of magnetization at room temperature is firstly demonstrated in a magnetically hard amorphous SmCo film grown on a (011)-cut 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (PMN-PT) substrate. Read More

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December 2018
2 Reads

Direct observation of quantum tunnelling charge transfers between molecules and semiconductors for SERS.

Nanoscale 2018 Dec 10. Epub 2018 Dec 10.

Department of Physics, Ewha Womans University, Seoul, 03760, Korea.

We used high-quality ZnO nanostructures/graphene substrates for understanding the mechanisms of charge transfer (CT) that take place under nonplasmonic conditions. As the optimal conditions for CT processes are found, we studied the range of CT normal to the ZnO surface that is coated with nanoscale HfO2 layers with different thicknesses. We could observe that CT decays over a few nanometers. Read More

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December 2018
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Bioaccumulation of polystyrene nanoplastics and their effect on the toxicity of Au ions in zebrafish embryos.

Nanoscale 2018 Dec 10. Epub 2018 Dec 10.

Hazards Monitoring Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology, 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea. and KRIBB School, University of Science and Technology, 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.

As nano- and micro-sized plastics accumulate in the environment and the food chain of animals, including humans, it is imperative to assess the effects of nanoplastics in living organisms in a systematic manner, especially because of their ability to adsorb potential toxicants such as pollutants, heavy metals, and organic macromolecules that coexist in the environment. Using the zebrafish embryo as an animal model, we investigated the bioaccumulation and in vivo toxicity of polystyrene (PS) nanoplastics individually or in combination with the Au ion. We showed that smaller PS nanoplastics readily penetrated the chorion and developing embryos and accumulated throughout the whole body, mostly in lipid-rich regions such as in yolk lipids. Read More

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December 2018
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Appearance of SERS activity in single silver nanoparticles by laser-induced reshaping.

Nanoscale 2018 Dec 11. Epub 2018 Dec 11.

DST Unit of NanoScience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India.

We report simultaneous plasmonic scattering and Raman spectroscopic observations of single citrate capped silver nanoparticles (AgNPs) which exhibit surface enhanced Raman scattering (SERS) upon meeting specific conditions induced by laser (532 nm) exposure. We show that nanoparticles which are not initially SERS active become SERS active by laser-induced reshaping/reorientation. A set-up developed for these observations enabled in situ high speed time-lapse characterization using plasmonic and Raman spectroscopies in conjunction with dark-field microscopy (DFM). Read More

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December 2018
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Self-assembly dynamics and antimicrobial activity of all l- and d-amino acid enantiomers of a designer peptide.

Nanoscale 2018 Dec 10. Epub 2018 Dec 10.

MDRCBB, Minnesota Dental Research Center for Biomaterials and Biomechanics, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Recent studies have shown that antimicrobial peptides (AMPs) can self-assemble into supramolecular structures, but this has been overlooked as causative of their antimicrobial activity. Also, the higher antimicrobial potency of d-enantiomers compared to l-enantiomers of AMPs cannot always be attributed to their different resistance to protease degradation. Here, we tested all l- and d-amino acid versions of GL13K, an AMP derived from a human protein, to study structural links between the AMP secondary structure, supramolecular self-assembly dynamics, and antimicrobial activity. Read More

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December 2018
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7.394 Impact Factor

Morphology-controlled copper nanowire synthesis and magnetic field assisted self-assembly.

Nanoscale 2018 Dec 10. Epub 2018 Dec 10.

Department of Chemistry, Portland State University, Portland, OR 972016, USA.

Morphology, dimensions, crystalline structure and compositions of nanomaterials are very critical in determining their unique characteristics. Here we report how the reducing agent concentration affects the surface morphology of copper nanowires and establish the optimized reaction conditions to synthesize high aspect ratio nanowires with a smooth surface. Also, reported is the magnetic field assisted technique to control the orientational and positional ordering of cupronickel nanowires (Cu/Ni NWs) on a large-scale area. Read More

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December 2018

Neuronal dynamics in HfO/AlO-based homeothermic synaptic memristors with low-power and homogeneous resistive switching.

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Inter-university Semiconductor Research Center (ISRC) and the Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, South Korea.

We studied the pseudo-homeothermic synaptic behaviors by integrating complimentary metal-oxide-semiconductor-compatible materials (hafnium oxide, aluminum oxide, and silicon substrate). A wide range of temperatures, from 25 °C up to 145 °C, in neuronal dynamics was achieved owing to the homeothermic properties and the possibility of spike-induced synaptic behaviors was demonstrated, both presenting critical milestones for the use of emerging memristor-type neuromorphic computing systems in the near future. Biological synaptic behaviors, such as long-term potentiation, long-term depression, and spike-timing-dependent plasticity, are developed systematically, and comprehensive neural network analysis is used for temperature changes and to conform spike-induced neuronal dynamics, providing a new research regime of neurocomputing for potentially harsh environments to overcome the self-heating issue in neuromorphic chips. Read More

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December 2018
2 Reads

Flexible focusing pattern realization of centimeter-scale planar super-oscillatory lenses in parallel fabrication.

Nanoscale 2018 Dec 11. Epub 2018 Dec 11.

Key Laboratory of Micro/Nano Systems for Aerospace (Ministry of Education), Northwestern Polytechnical University, Xi'an 710072, China. and Shaanxi Province Key Laboratory of Micro and Nano Electro-Mechanical Systems, Northwestern Polytechnical University, Xi'an 710072, China.

Planar super-oscillatory lenses (SOLs) can exert far-field foci beyond the diffraction limit free from the contribution of evanescent waves. However, the reported design methods of SOLs are always complicated and divergent, leading to a poor control over the desired focusing patterns. Furthermore, the existing device sizes of SOLs are mainly within hundreds of micrometers accompanied by a subwavelength-scale feature size. Read More

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December 2018
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Multivalent aptamer-modified tetrahedral DNA nanocage demonstrates high selectivity and safety for anti-tumor therapy.

Nanoscale 2018 Dec 11. Epub 2018 Dec 11.

Key Laboratory of Modern Chinese Medicines, China Pharmaceutical University, Nanjing 210009, PR China.

The fabrication of aptamers on DNA nanostructures through the DNA origami method has shown great potential for in vitro and in vivo tumor targeting delivery. Herein, tetrahedral multivalent DNA (Td) nanocages modified with different numbers of MUC1-aptamers (nApt-Td) were obtained via the self-assembly of nucleic acid backbones containing the aptamer DNA fragment without complicated chemical modification steps. Then, doxorubicin (DOX) was encapsulated in the modified nApt-Td nanocages via non-covalent interactions. Read More

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December 2018
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High growth per cycle thermal atomic layer deposition of Ni films using an electron-rich precursor.

Nanoscale 2018 Dec 10. Epub 2018 Dec 10.

International Joint Research Center for Photoresponsive Molecules and Materials, School of Chemical and Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, P. R. China.

An efficient process for thermal atomic layer deposition (ALD) of Ni film with high growth per cycle (GPC) value is developed in this study using an electron-rich compound (N,N,N',N'-tetramethylethylenediamine) (bis(2,4-pentanedionato)) nickel(ii) and anhydrous hydrazine as the reactants. The thermal properties and adsorption behavior of selected compounds were studied. Significantly, a high film GPC value of 2. Read More

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December 2018

Chemical etching of pH-sensitive aggregation-induced emission-active gold nanoclusters for ultra-sensitive detection of cysteine.

Nanoscale 2018 Dec 10. Epub 2018 Dec 10.

Beijing Advanced Innovation Center for Materials Genome Engineering, Research Center for Bioengineering and Sensing Technology, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China.

This study reports the utilization of thiol-induced chemical etching of aggregation-induced emission (AIE)-active Au nanoclusters (NCs) for the facile, sensitive, and selective detection of cysteine. The AIE-active Au NCs were formed in an acidic solution containing excess Au(i)-thiolate complexes. At an acidic pH (2. Read More

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December 2018

Correction: Controlled p-type substitutional doping in large-area monolayer WSe crystals grown by chemical vapor deposition.

Nanoscale 2018 Dec 11. Epub 2018 Dec 11.

Department of Electrical and Computer Engineering, University of Minnesota, 200 Union Street, Minneapolis, Minnesota 55455, USA.

Correction for 'Controlled p-type substitutional doping in large-area monolayer WSe2 crystals grown by chemical vapor deposition' by Stephen A. Campbell et al., Nanoscale, 2018, 10, 21374-21385. Read More

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December 2018