12,924 results match your criteria atomic layer


Role of TiO2 coating layer on the performance of Cu2O photocathode in photoelectrochemical CO2 reduction.

Nanotechnology 2021 Jun 23. Epub 2021 Jun 23.

National Center for Nanoscience and Technology, 11 Beiyitiao, Zhongguancun, Haidian District, 100190, CHINA.

TiO2 is usually employed as a protective layer for Cu2O in photoelectrocatalytic CO2 reduction. However, the role of TiO2 layer on CO2 reduction activity and selectivity is still elusive. In this work, a systematic investigation is carried out to probe the impact of the deposition parameters of TiO2 overlayer, including the temperature and thickness, on CO2 reduction performance. Read More

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Robust Protection of III-V Nanowires in Water Splitting by a Thin Compact TiO Layer.

ACS Appl Mater Interfaces 2021 Jun 23. Epub 2021 Jun 23.

Department of Electronic and Electrical Engineering, University College London, London WC1E 7JE, U.K.

Narrow-band-gap III-V semiconductor nanowires (NWs) with a suitable band structure and strong light-trapping ability are ideal for high-efficiency low-cost solar water-splitting systems. However, due to their nanoscale dimension, they suffer more severe corrosion by the electrolyte solution than the thin-film counterparts. Thus, short-term durability is the major obstacle for using these NWs for practical water-splitting applications. Read More

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Cyclic Plasma Halogenation of Amorphous Carbon for Defect-Free Area-Selective Atomic Layer Deposition of Titanium Oxide.

ACS Appl Mater Interfaces 2021 Jun 23. Epub 2021 Jun 23.

cMACS, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.

As critical dimensions in integrated circuits continue to shrink, the lithography-based alignment of adjacent patterned layers becomes more challenging. Area-selective atomic layer deposition (ALD) allows circumventing the alignment issue by exploiting the chemical contrast of the exposed surfaces. In this work, we investigate the selective deposition of TiO by plasma halogenation of amorphous carbon (a-C:H) acting as a growth-inhibiting layer. Read More

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CNT/AlO core-shell nanostructures for the electrochemical detection of dihydroxybenzene isomers.

Phys Chem Chem Phys 2021 Jun 22. Epub 2021 Jun 22.

Department of Engineering, University of Messina, C.Da Di Dio, I-98166 Messina, Italy.

We report CNT/Al2O3 core-shell nanostructures for the electrochemical detection of dihydroxybenzene (DHB) isomers. Amorphous films of Al2O3 (1.2-15. Read More

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Highly Dense and Stable p-Type Thin-Film Transistor Based on Atomic Layer Deposition SnO Fabricated by Two-Step Crystallization.

ACS Appl Mater Interfaces 2021 Jun 22. Epub 2021 Jun 22.

Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.

Over the past several decades, tin monoxide (SnO) has been studied extensively as a p-type thin film transistor (TFT). However, its TFT performance is still insufficient for practical use. Many studies suggested that the instability of the valence state of Sn (Sn/Sn) is a critical reason for the poor performance such as limited mobility and low on/off ratio. Read More

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Magneto-Ionics in Single-Layer Transition Metal Nitrides.

ACS Appl Mater Interfaces 2021 Jun 22. Epub 2021 Jun 22.

Departament de Física, Universitat Autònoma de Barcelona, Cerdanyola del Vallès E-08193, Spain.

Magneto-ionics allows for tunable control of magnetism by voltage-driven transport of ions, traditionally oxygen or lithium and, more recently, hydrogen, fluorine, or nitrogen. Here, magneto-ionic effects in single-layer iron nitride films are demonstrated, and their performance is evaluated at room temperature and compared with previously studied cobalt nitrides. Iron nitrides require increased activation energy and, under high bias, exhibit more modest rates of magneto-ionic motion than cobalt nitrides. Read More

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Phonon lasing with an atomic thin membrane resonator at room temperature.

Opt Express 2021 May;29(11):16241-16248

Graphene has been considered as one of the best materials to implement mechanical resonators due to their excellent properties such as low mass, high quality factors and tunable resonant frequencies. Here we report the observation of phonon lasing induced by the photonthermal pressure in a few-layer graphene resonator at room temperature, where the graphene resonator and the silicon substrate form an optical cavity. A marked threshold in the oscillation amplitude and a narrowing linewidth of the vibration mode are observed, which confirms a phonon lasing process in the graphene resonator. Read More

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Adhesion as a component of retention force of overdenture prostheses-study on selected Au based dental materials used for telescopic crowns using atomic force microscopy and contact angle techniques.

J Mech Behav Biomed Mater 2021 Jun 15;121:104648. Epub 2021 Jun 15.

Nanometrology Department, Wroclaw University of Science and Technology, Janiszewskiego 11/17, 50-372, Wroclaw, Poland.

Contemporary prosthetic materials are characterized by highly specific preparation for a given application. This means that at the stage of their creation, not only their function is taken into account, but also the long-term behavior of this material during use. In the case of telescopic crowns, an important factor not yet appearing in the research is the aspect of adhesion force and its dependence on the type of biomaterial, but also the properties of human saliva. Read More

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Fast Surface Dynamics on a Metallic Glass Nanowire.

ACS Nano 2021 Jun 21. Epub 2021 Jun 21.

Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.

The dynamics near the surface of glasses can be much faster than in the bulk. We studied the surface dynamics of a Pt-based metallic glass using electron correlation microscopy with sub-nanometer resolution. Our studies show an ∼20 K suppression of the glass transition temperature at the surface. Read More

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Borate-driven ionic rectifiers based on sugar-bearing single nanochannels.

Nanoscale 2021 Jun 21. Epub 2021 Jun 21.

Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET - CC 16 Suc. 4, 1900 La Plata, Argentina.

Recently, much scientific effort has been centered on the control of the ionic transport properties of solid state nanochannels and the rational design and integration of chemical systems to induce changes in the ionic transport by means of interactions with selected target molecules. Here, we report the fabrication of a novel nanofluidic device based on solid-state nanochannels, which combines silane chemistry with both track-etched and atomic layer deposition (ALD) technologies. Nanodevice construction involves the coating of bullet-shaped single-pore nanochannels with silica (SiO2) by ALD and subsequent surface modification by reaction between silanol groups exposed on pore walls and N-(3-triethoxysilylpropyl)-gluconamide, in order to create a gluconamide-decorated nanochannel surface. Read More

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Layer-by-Layer Solution-Processed Organic Solar Cells with Perylene Diimides as Acceptors.

ACS Appl Mater Interfaces 2021 Jun 21. Epub 2021 Jun 21.

College of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China.

Layer-by-layer (LBL) sequential solution processing of the active layer has been proven as an effective strategy to improve the performance of organic solar cells (OSCs), which could adjust vertical phase separation and improve device performance. Although perylene diimide (PDI) derivatives are typical acceptors with excellent photoelectric properties, there are few studies on PDI-based LBL OSCs. Herein, three PDI acceptors (TBDPDI-C, TBDPDI-C, and SdiPDI) were used to fabricate LBL and bulk heterojunction (BHJ) OSCs, respectively. Read More

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Distinguishing Adsorbed and Deposited Ionomers in the Catalyst Layer of Polymer Electrolyte Fuel Cells Using Contrast-Variation Small-Angle Neutron Scattering.

ACS Omega 2021 Jun 3;6(23):15257-15263. Epub 2021 Jun 3.

Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tokai, Ibaraki 319-1106, Japan.

The ionomers distributed on carbon particles in the catalyst layer of polymer electrolyte fuel cells (PEFCs) govern electrical power via proton transport and oxygen permeation to active platinum. Thus, ionomer distribution is a key to PEFC performance. This distribution is characterized by ionomer adsorption and deposition onto carbon during the catalyst-ink coating process; however, the adsorbed and deposited ionomers cannot easily be distinguished in the catalyst layer. Read More

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Influence of monomers involved in the fabrication of a novel PES based nanofiltration thin-film composite membrane and its performance in the treatment of common effluent (CETP) textile industrial wastewater.

J Environ Health Sci Eng 2021 Jun 16;19(1):515-529. Epub 2021 Mar 16.

Environmental & Water Technology Centre of Innovation, Ngee Ann Polytechnic, 599489 Singapore, Singapore.

Objective: In this article, monomers (tannic acid (TA) and m- phenylenediamine (MPD)) were used in the fabrication of a novel PES based thin-film composite nanofiltration (TFC-NF) membrane for the treatment of a common effluent treatment plant (CETP) of textile industrial wastewater.

Membrane Synthesis: PES support sheets and TFC layers were fabricated via non-solvent induced phase inversion and in-situ interfacial polymerization (IP) process. The ultra-thin active layer was synthesized via the IP process with monomers such as tannic acid (TA) and m- phenylenediamine (MPD). Read More

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Dendritic Nanostructured Waste Copper Wires for High-Energy Alkaline Battery.

Nanomicro Lett 2019 Dec 12;12(1). Epub 2019 Dec 12.

School of Chemical Engineering, Chonnam National University, Gwangju, 500-757, South Korea.

Rechargeable alkaline batteries (RABs) have received remarkable attention in the past decade for their high energy, low cost, safe operation, facile manufacture, and eco-friendly nature. To date, expensive electrode materials and current collectors were predominantly applied for RABs, which have limited their real-world efficacy. In the present work, we propose a scalable process to utilize electronic waste (e-waste) Cu wires as a cost-effective current collector for high-energy wire-type RABs. Read More

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December 2019

Atomic Layer Deposition-Assisted Construction of Binder-Free [email protected] Carbon Nanospheres Films as Advanced Host for Sulfur Cathode.

Nanomicro Lett 2019 Aug 2;11(1):64. Epub 2019 Aug 2.

State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China.

Rational design of hybrid carbon host with high electrical conductivity and strong adsorption toward soluble lithium polysulfides is the main challenge for achieving high-performance lithium-sulfur batteries (LSBs). Herein, novel binder-free [email protected] carbon nanospheres (N-CNSs) films as sulfur host are firstly synthesized via a facile combined hydrothermal-atomic layer deposition method. The cross-linked multilayer N-CNSs films can effectively enhance the electrical conductivity of electrode and provide physical blocking "dams" toward the soluble long-chain polysulfides. Read More

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High-Index-Faceted NiS Branch Arrays as Bifunctional Electrocatalysts for Efficient Water Splitting.

Nanomicro Lett 2019 Feb 5;11(1):12. Epub 2019 Feb 5.

State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China.

For efficient electrolysis of water for hydrogen generation or other value-added chemicals, it is highly relevant to develop low-temperature synthesis of low-cost and high-efficiency metal sulfide electrocatalysts on a large scale. Herein, we construct a new core-branch array and binder-free electrode by growing NiS nanoflake branches on an atomic-layer-deposited (ALD) TiO skeleton. Through induced growth on the ALD-TiO backbone, cross-linked NiS nanoflake branches with exposed {[Formula: see text]} high-index facets are uniformly anchored to the preformed TiO core forming an integrated electrocatalyst. Read More

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February 2019

Impact of COVID-19 on Cardiovascular Testing in the United States Versus the Rest of the World: The INCAPS-COVID Study.

JACC Cardiovasc Imaging 2021 Jun 10. Epub 2021 Jun 10.

Technion Israel Institute of Technology, Haifa, Israel.

Objectives: This study sought to quantify and compare the decline in volumes of cardiovascular procedures between the United States and non-US institutions during the early phase of the coronavirus disease-2019 (COVID-19) pandemic.

Background: The COVID-19 pandemic has disrupted the care of many non-COVID-19 illnesses. Reductions in diagnostic cardiovascular testing around the world have led to concerns over the implications of reduced testing for cardiovascular disease (CVD) morbidity and mortality. Read More

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Role of the interactions of soft hyaluronan nanomaterials with CD44 and supported bilayer membranes in the cellular uptake.

Colloids Surf B Biointerfaces 2021 Jun 8;205:111916. Epub 2021 Jun 8.

Institut Galien Paris Saclay, CNRS UMR 8612, Université Paris-Saclay, Faculté de Pharmacie, 5 rue J-B Clément, 92296, Châtenay-Malabry, France. Electronic address:

Increasing valence by acting on nanomaterial morphology can enhance the ability of a ligand to specifically bind to targeted cells. Herein, we investigated cell internalization of soft hyaluronic acid (HA) nanoplatelets (NPs) that exhibit a typical hexagonal shape, flat surfaces and high aspect ratio (Γ≈12 to 20), as characterized by atomic force microscopy in hydrated conditions. Fluorescence imaging revealed that internalization of HA-NPs by a T24 tumor cell line and by macrophages was higher than native polysaccharide in a dose-dependent and time-dependent manners. Read More

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Ultrawide Frequency Tuning of Atomic Layer van der Waals Heterostructure Electromechanical Resonators.

Nano Lett 2021 Jun 18. Epub 2021 Jun 18.

Department of Electrical, Computer, & Systems Engineering, Case School of Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States.

We report on the experimental demonstration of atomically thin molybdenum disulfide (MoS)-graphene van der Waals (vdW) heterostructure nanoelectromechanical resonators with ultrawide frequency tuning. With direct electrostatic gate tuning, these vdW resonators exhibit exceptional tunability, in general, Δ/ > 200%, for continuously tuning the same device and the same mode (e.g. Read More

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Peering into buried interfaces with X-rays and electrons to unveil MgCO formation during CO capture in molten salt-promoted MgO.

Proc Natl Acad Sci U S A 2021 Jun;118(26)

Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, Eidgenössische Technische Hochschule (ETH) Zürich, 8092 Zürich, Switzerland;

The addition of molten alkali metal salts drastically accelerates the kinetics of CO capture by MgO through the formation of MgCO However, the growth mechanism, the nature of MgCO formation, and the exact role of the molten alkali metal salts on the CO capture process remain elusive, holding back the development of more-effective MgO-based CO sorbents. Here, we unveil the growth mechanism of MgCO under practically relevant conditions using a well-defined, yet representative, model system that is a MgO(100) single crystal coated with NaNO The model system is interrogated by in situ X-ray reflectometry coupled with grazing incidence X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. When bare MgO(100) is exposed to a flow of CO, a noncrystalline surface carbonate layer of 7-Å thickness forms. Read More

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Anomalous Laterally Stressed Kinetically Trapped DNA Surface Conformations.

Nanomicro Lett 2021 May 22;13(1):130. Epub 2021 May 22.

Federal Research and Clinical Center of Physical-Chemical Medicine, Malaya Pirogovskaya, 1a, Moscow, 119435, Russian Federation.

Highlights: DNA kinking is inevitable for the highly anisotropic 1D-1D electrostatic interaction with the one-dimensionally periodically charged surface. The double helical structure of the DNA kinetically trapped on positively charged monomolecular films comprising the lamellar templates is strongly laterally stressed and extremely perturbed at the nanometer scale. The DNA kinetic trapping is not a smooth 3D-> 2D conformational flattening but is a complex nonlinear in-plane mechanical response (bending, tensile and unzipping) driven by the physics beyond the scope of the applicability of the linear worm-like chain approximation. Read More

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12-state multi-level cell storage implemented in a 128 Mb phase change memory chip.

Nanoscale 2021 Jun 1;13(23):10455-10461. Epub 2021 Apr 1.

State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.

128 Mb Phase Change Memory (PCM) chips show potential for many applications in artificial intelligence. A PCM cell often has a sandwich structure that consists of a TiN bottom electrode, a phase change material, and a top metal. TiN films prepared by atomic layer deposition have high thermal stability, and a WN coating layer on the TiN electrode can prevent oxidation in the electric and thermal field, achieving high endurance of the TiN electrode over 10 cycles. Read More

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Two-dimensional ferroelasticity in van der Waals β'-InSe.

Nat Commun 2021 Jun 16;12(1):3665. Epub 2021 Jun 16.

Department of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.

Two-dimensional (2D) materials exhibit remarkable mechanical properties, enabling their applications as flexible and stretchable ultrathin devices. As the origin of several extraordinary mechanical behaviors, ferroelasticity has also been predicted theoretically in 2D materials, but so far lacks experimental validation and investigation. Here, we present the experimental demonstration of 2D ferroelasticity in both exfoliated and chemical-vapor-deposited β'-InSe down to few-layer thickness. Read More

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The crucial role of heavy metals on the interaction of engineered nanoparticles with polystyrene microplastics.

Water Res 2021 Jun 1;201:117317. Epub 2021 Jun 1.

Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, HKSAR, P.R.China; HKBU Institute of Research and Continuing Education, Shenzhen Virtual University Park, Shenzhen, P.R.China. Electronic address:

Despite continuous research on microplastics (MPs), studies exploring the complexity of interaction between MPs and other aqueous constituents in multi-solute systems are scarce. In this study, the uptake and release of nanoceria (CeNPs) by various polystyrene MPs (PSMPs) were investigated. Results showed that PSMPs in the presence of heavy metals (HMs) exhibited a substantially higher sorption affinity for isotropic charged CeNPs than PSMPs alone; this enhanced affinity was attributed to the formation of PSMP-HM-CeNP complexes. Read More

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Structural and compositional analysis of (InGa)(AsSb)/GaAs/GaP Stranski-Krastanov quantum dots.

Light Sci Appl 2021 Jun 15;10(1):125. Epub 2021 Jun 15.

Department of Applied Physics, Eindhoven University of Technology, 5612 AZ, Eindhoven, The Netherlands.

We investigated metal-organic vapor phase epitaxy grown (InGa)(AsSb)/GaAs/GaP Stranski-Krastanov quantum dots (QDs) with potential applications in QD-Flash memories by cross-sectional scanning tunneling microscopy (X-STM) and atom probe tomography (APT). The combination of X-STM and APT is a very powerful approach to study semiconductor heterostructures with atomic resolution, which provides detailed structural and compositional information on the system. The rather small QDs are found to be of truncated pyramid shape with a very small top facet and occur in our sample with a very high density of ∼4 × 10 cm. Read More

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Effect of Thickness and Stacking Order on Raman Spectrum of Layered CrCl3.

J Phys Condens Matter 2021 Jun 14. Epub 2021 Jun 14.

School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha, Hunan Province, Hunan 410004, Changsha, 410114, CHINA.

Layer- and stacking-dependent physical properties discovered in van der Waals materials have attracted a lot of attention recently. In this work, we have investigated the Raman spectrum of layered magnetic CrCl3with different atomic thickness and stacking order from first principles. Our study indicates Raman shift of Rand C2/m phase is near degenerate except that the first and fourth Raman resonant modes exhibit a marked peak difference about 3 cm-1, which can be understood by stacking-dependent vibrational eigenvectors. Read More

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Soft-matter properties of multilayer chromosomes.

Authors:
Joan-Ramon Daban

Phys Biol 2021 Jun 14. Epub 2021 Jun 14.

Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, Facultat de Biociències, Bellaterra, Barcelona, 08193, SPAIN.

This perspective aims to identify the relationships between the structural and dynamic properties of chromosomes and the fundamental properties of soft-matter systems. Chromatin is condensed into metaphase chromosomes during mitosis. The resulting structures are elongated cylinders having micrometer-scale dimensions. Read More

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Superior removal of As(III) and As(V) from water with Mn-doped β-FeOOH nanospindles on carbon foam.

J Hazard Mater 2021 Jun 7;418:126347. Epub 2021 Jun 7.

Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720-1710, USA. Electronic address:

Arsenic pollution of water is one of the severest environmental challenges threatening human health. Iron-based nanomaterials have been demonstrated effective in arsenic removal. However, they generally suffer from low removal efficiency towards highly toxic As(III), loss of active sites owing to agglomeration, and poor reusability. Read More

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Air-water interfacial behaviour of whey protein and rapeseed oleosome mixtures.

J Colloid Interface Sci 2021 May 30;602:207-221. Epub 2021 May 30.

Laboratory of Physics and Physical Chemistry of Foods, Wageningen University, Bornse Weilanden 9, 6708WG Wageningen, the Netherlands. Electronic address:

Hypothesis: Plant seeds store lipids in oleosomes, which are storage organelles with a triacylglycerol (TAG) core surrounded by a phospholipid monolayer and proteins. Due to their membrane components, oleosomes have an affinity for the air/oil-water interface. Therefore, it is expected that oleosomes can stabilise interfaces, and also compete with proteins for the air-water interface. Read More

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Unraveling the influence of substrate on the growth rate, morphology and covalent structure of surface adherent polydopamine films.

Colloids Surf B Biointerfaces 2021 Jun 2;205:111897. Epub 2021 Jun 2.

Department of Chemistry and Physics of Surfaces and Interfaces, Institute of Macromolecular Chemistry, Czech Academy of Sciences, 162 06, Prague 6, Czech Republic. Electronic address:

Polydopamine (PDA), also known as synthetic melanin, is widely used as a biomimetic anchoring layer for the modification of various solid substrates. PDA is utilized for a wide range of biomedical, sensing and tribological applications, even though the polymer's precise covalent structure has not been completely revealed yet. Even more, it is not evident to which extent the chemical nature of the substrate, on which the layer is formed, influences and predetermines the covalent structure of resulting PDA. Read More

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