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PubMed Journals Articles About "Atomic Scale View Oxidation Reduction Supported Ultrathin Islands" RSS

19:05 EDT 23rd October 2019 | BioPortfolio

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Showing "Atomic Scale View Oxidation Reduction Supported Ultrathin Islands" PubMed Articles 1–25 of 18,000+

An Atomic-Scale View of the Oxidation and Reduction of Supported Ultrathin FeO Islands.

By means of scanning tunneling microscopy (STM) measurements we studied in situ the oxidation and reduction of FeO bilayer islands on Au(111) by oxygen (O2) and hydrogen (H2), respectively. The FeO islands respond very dynamically towards O2, with the coordinatively unsaturated ferrous (CUF) sites at the island edges being essential for O2 dissociation and O atom incorporation. An STM movie obtained during oxidation reveals how further O2 molecules can dissociate after the consumption of all initially exist...


Atomic Layer Deposition for Membranes, Metamaterials, and Mechanisms.

Bending and folding techniques such as origami and kirigami enable the scale-invariant design of 3D structures, metamaterials, and robots from 2D starting materials. These design principles are especially valuable for small systems because most micro- and nanofabrication involves lithographic patterning of planar materials. Ultrathin films of inorganic materials serve as an ideal substrate for the fabrication of flexible microsystems because they possess high intrinsic strength, are not susceptible to plast...

Ultrathin magnetic Mg-Al LDH photocatalyst for enhanced CO reduction: Fabrication and mechanism.

The two-dimensional (2D) ultrathin Mg-Al layered double hydroxide modified by magnetic FeO (FeO/Mg-Al LDH) was successfully synthesized via the co-precipitation method. The FeO/Mg-Al LDH not only exhibits superior separation efficiency of charge carriers but also possesses signally enhanced photocatalytic activity for CO reduction than Mg-Al LDH. The as-prepared FeO/Mg-Al LDH affords the CO and CH generation rate of 442.2 µmol g h and 223.9 µmol g h. The enhanced reduction CO activity mainly c...


An atomic-scale view of cyclocarbon synthesis.

Ultrathin PdFePb nanowires: One-pot aqueous synthesis and efficient electrocatalysis for polyhydric alcohol oxidation reaction.

Synthesis of high-efficiency catalysts for alcohol oxidation reaction caused great interest in direct alcohol fuel cells (DAFCs). Ultrathin PdFePb nanowires (NWs) with an average diameter of 2.3 nm were synthesized by a simple and fast one-pot aqueous synthesis, using octylphenoxypolyethoxyethanol (NP-40) as the structure-directing agent. The as-prepared PdFePb NWs displayed an increscent electrochemically active surface area (ECSA, 121.18 m g ). For ethylene glycol oxidation reaction (EGOR) and gly...

Ultrathin Polyaniline-Coated Pt-Ni Alloy Nanooctahedra for Electrochemical Methanol Oxidation Reaction.

Controlling the morphology and composition of nanocatalysts constructed with metals and conductive polymers has attracted owing to their high possibility to the development of high-efficient catalysts for various catalytic applications. Here, we present a facile synthetic approach for the ultrathin polyaniline-coated Pt-Ni nanooctahedra (Pt-Ni@PANI hybrid) with controllable PANI shell thicknesses. Pt-Ni nanooctahedra/C catalysts enclosed by PANI shell thicknesses from 0.6 to 2.4 nm were obtained by fine con...

Resolving the Correlation between Tip-Enhanced Resonance Raman Scattering and Local Electronic States with 1 nm Resolution.

Low-temperature tip-enhanced Raman spectroscopy (TERS) enables chemical identification with single-molecule sensitivity and extremely high spatial resolution even down to the atomic scale. The large enhancement of Raman scattering obtained in TERS can originate from physical and/or chemical enhancement mchanisms. Whereas physical enhancement requires a strong near-field through excitation of localized surface plasmons, chemical enhancement is governed by resonance in the electronic structure of the sample, ...

Scalable synthesis of water-dispersible two-dimensional manganese dioxide monosheets.

The two-dimensional nanomaterials with atomic thickness usually exhibit high specific surface areas and atom exposure rates, which are suitable for surface reaction related applications. In this study, we selected the oxalate ions as the structure-inducing agent to synthesize δ-MnO<sub>2</sub> ultrathin nanosheets (~4.5 nm) via a facile hydrothermal method. Subsequently, an efficient exfoliation method to prepare single-layer MnO<sub>2</sub> nanosheet...

Ultrathin Polyamide Nanofiltration Membrane Fabricated on Brush-Painted Single-Walled Carbon Nanotube Network Support for Ion Sieving.

Recently, polyamide membranes with nanomaterials coated supports were reportedly overcoming the limitation of conventional supports and thus opening a new insight on the formation of ultrathin polyamide layer with unprecedented high separation performance. However, the feasibility of the new generation nanomaterials coated supports for stable large-scale polyamide membrane fabrication is still unclear. Herein, we report a simple and highly controllable large-scale fabrication technique for single-walled car...

The Effects of Atomic Scale Strain Relaxation on the Electronic Properties of Monolayer MoS2.

The ability to control nanoscale electronic properties by introducing macroscopic strain is of critical importance for the implementation of 2D materials into flexible electronics and next generation strain engineering devices. In this work we correlate the atomic-scale lattice deformation with a systematic macroscopic bending of monolayer molybdenum disulfide films by using scanning tunneling microscopy and spectroscopy implemented with a custom-built sample holder to control the strain. Using this techniq...

Thermal transports of one-dimensional ultrathin carbon structures.

Carbon atomic chain, linear benzene polymers, and carbon nanothreads are all one-dimensional (1D) ultrathin carbon structures. They possess excellent electronic and mechanical properties; however, their thermal transport properties have been rarely explored. Here, we systematically study their thermal conductance by combining the nonequilibrium Green's function and force field methods. The thermal conductance varies from 0.4 to 1.9 nW/K at 1000 K, and phonon transport in the linear benzene polymers and carb...

Ultrathin g-CN with enriched surface carbon vacancies enables highly efficient photocatalytic nitrogen fixation.

An ultra-thin carbon nitride with loose structure and more carbon defects on the surface was achieved through high-temperature peeling methods. Its composition, morphological characteristics, surface defect types and electrochemical properties have been measured. After atomic scale structure control and surface defects construction, the photocatalytic activity of prepared g-CN-V for ammonia conversion from dinitrogen can be greatly improved in contrast with bulk g-CN. Under visible light irradiation, the de...

Ultrathin one-dimensional platinum-cobalt nanowires as efficient catalysts for the glycerol oxidation reaction.

Direct fuel cells are regarded as the most portable device for alleviating the problems of the energy dilemma and environmental disruption. Although direct fuel cells have a number of advantages, the lack of highly-efficient anode catalysts inhibits their wide application. To address this challenge, we report a facile one-pot method to fabricate a series of ultrathin platinum-cobalt (Pt-Co) nanowires with different proportions. The as-prepared catalysts all have one-dimensional ultrathin nanowire structures...

Oxidation resistance of nanoscale zero-valent iron supported on exhausted coffee grounds.

In this study, nanoscale zero-valent iron (NZVI) was supported by exhausted coffee grounds. Exhausted coffee grounds are a crucial waste generated in enormous amounts. Since supported nanoscale particles have a lower free energy than bare particles, oxidation resistance of supported NZVI on coffee grounds (NZVI-Coffee ground) is postulated. The main aim of this study was to ascertain the enhanced oxidation resistance of NZVI-Coffee ground. Synthesized materials were dried and stored in the air at temperatur...

Microbial selenite reduction coupled to anaerobic oxidation of methane.

Denitrifying anaerobic methane oxidation (DAMO) is the process of coupling the anaerobic oxidation of methane (AOM) with denitrification, which plays an important part in controlling the flow of methane in anoxic niches. In this study, we explored the feasibility of microbial selenite reduction using methane by DAMO culture. Isotopic CH and long-term experiments showed that selenite reduction was coupled to methane oxidation, and selenite was ultimately reduced to Se (0) by the analyses of scanning electron...

Ultrathin oxygen-vacancy abundant WO decorated monolayer BiWO nanosheet: A 2D/2D heterojunction for the degradation of Ciprofloxacin under visible and NIR light irradiation.

At present, environmental pollution caused by refractory organic pollutants becomes more serious. Semiconductor-based photocatalysis technology, an idea and continuable technology by solar-light-driven, is widely employed to address this situation. Here, oxygen-vacancy rich WO decorated monolayer BiWO nanosheet composite as an atomic scale heterojunction with high active species and ultrafast charge carrier transfer was rationally constructed. The atomic scale V-WO/BiWO composite displayed remarkable photoa...

Step-Edge-Induced Anisotropic Chiral Spin Coupling in Ultrathin Magnetic Films.

Step edges represent a local break of lateral symmetry in ultrathin magnetic films. In our experiments, we investigate the spin coupling across atomic step edges on Fe/W(110) by means of spin-polarized scanning tunneling microscopy and spectroscopy. Local modifications of the spin texture toward step edges separating double from single layer areas are observed, and selection rules indicate a chiral spin coupling that significantly changes with the propagation along the [11[over ¯]0] or the [001] crystallog...

Metallic glass ultrathin films with hierarchical structure and their dynamic and thermodynamic behavior.

Metallic glass (MG) ultrathin films with hierarchical structure were in situ grown and characterized by scanning tunneling microscopy. A reversible dynamic behavior is observed at 77 K indicating a high mobility within the Fe85Sc15 MG ultrathin films. The complete scheme of the phase transition from amorphous solid to supercooled liquid and further to the crystalline phase is depicted. We find Fe85Sc15 MG ultrathin films with a reduction of the glass transition temperature of ∼290 K and an expanded temper...

Giant rectified voltages from magnetization dynamics of an atomically sharp domain wall.

Magnetization dynamics is of great interest in the aim of using spins in nanoscale information technology, which ultimately should reach the atomic size. In the present work, we explore magnetization and spin dynamics in atomic ferromagnetic contacts both experimentally and theoretically. We demonstrate that domain walls induce a giant rectification effect as the DC voltages measured across the contacts are greatly enhanced by the presence of a domain wall. This effect is understood using multiscale dynamic...

Implementing functionality in molecular self-assembled monolayers.

The planar heterocyclic molecules 1,6,7,12-tetraazaperylene on an Ag(111) metal substrate show different charging characteristics depending on their local environment: next to vacancies in self-assembled islands, molecules can be charged by local electric fields, whereas their charge state is fixed otherwise. This enables the activation of selected molecules inside islands by vacancy creation from scanning-probe based manipulation. This concept allows for combining the precise mutual atomic-scale alignment ...

Atomic-Scale Observation of the Metal-Promoter Interaction in Rh-Based Syngas Upgrading Catalysts.

The direct conversion of syngas to ethanol is a cornerstone reaction in evolving technologies of CO2 utilization and hydrogen storage, which is typically performed using promoted Rh catalysts. A rational catalyst development requires a detailed structural understanding of the activated catalyst and in particular, the specific roles that promoters play in driving the chemoselectivity of this process. Herein, we report for the first time a comprehensive and comparative atomic-scale study of metal-promoter int...

Multilayer graphene functionalized through thermal 1,3-dipolar cycloadditions with imino esters: a versatile platform for supported ligands in catalysis.

Multilayer graphene (MLG), obtained by mild sonication of graphite in NMP or pyridine, was fully characterized via atomic force microscopy (AFM), transmission electron microscopy (TEM), Raman spectroscopy and X-ray photoemission spectroscopy (XPS). Then, it was functionalized via 1,3-dipolar cycloaddition with azomethine ylides generated by thermal 1,2-prototropy of various imino esters. The resulting MLG, containing substituted proline-based amine functions, was characterized by XPS and it showed high nitr...

Unconventional p-d Hybridization Interaction in PtGa Ultrathin Nanowires Boosts Oxygen Reduction Electrocatalysis.

Alloying 3d transition metals with Pt has been discovered as an effective strategy to boost the catalytic activity in oxygen reduction reaction (ORR), which, however, often raises the insufficient catalyst durability issue due to rapid leaching of the 3d metal elements. To overcome this issue and realize enhancements in both the activity and durability properties, here we report a new catalytic structure based on PtGa ultrathin alloy nanowires (NWs), which feature an unconventional strong p-d hybridization ...

Controlling the Chemical Bonding of Highly Dispersed Co Atoms Anchored on an Ultrathin g-CN@Carbon Sphere for Enhanced Electrocatalytic Activity of the Oxygen Evolution Reaction.

Controlling the chemical bonding of an active atom and carbon support is an effective strategy for enhancing the electrocatalytic activity of a metal-nitrogen/carbon catalyst. Herein, highly dispersed Co atoms are successfully prepared by using an ultrathin g-CN@carbon sphere as the support, and subsequently the well-defined Co-N and Co-O bonds on the atomic level are controllably constructed by adjusting the calcination atmosphere. Results show that highly dispersed Co with Co-O and Co-N bonds exhibits exc...

Surface-oxygen vacancy defect-promoted electron-hole separation of defective tungsten trioxide ultrathin nanosheets and their enhanced solar-driven photocatalytic performance.

Defective WO ultrathin surface-engineered nanosheets are fabricated by a solvothermal and low-temperature surface hydrogenation reduction strategy. The obtained defective WO ultrathin nanosheets with thicknesses of ∼4 nm possess a relatively large surface area of ∼25 m g. After surface engineering, the bandgap is narrowed to ∼2.48 eV due to the presence of surface oxygen vacancies, which further enhance the visible light absorption. The defective WO ultrathin nanosheets exhibit excellent solar-d...


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