A5028823168- Surface and Thin Film Phenomena
- nanoparticles nucleation surface interactions
- Graphene research and applications
- Advanced Chemical Physics Studies
- Quantum and electron transport phenomena
- Chemical and Physical Properties of Materials
- Theoretical and Computational Physics
- Magnetic properties of thin films
- Advancements in Battery Materials
- Nanocluster Synthesis and Applications
- 2D Materials and Applications
- Catalytic Processes in Materials Science
- Gold and Silver Nanoparticles Synthesis and Applications
- Mesoporous Materials and Catalysis
- Advanced ceramic materials synthesis
- Zeolite Catalysis and Synthesis
- MXene and MAX Phase Materials
- Boron and Carbon Nanomaterials Research
- Electronic and Structural Properties of Oxides
- Gas Sensing Nanomaterials and Sensors
- Molecular Junctions and Nanostructures
- Electrocatalysts for Energy Conversion
- Copper-based nanomaterials and applications
- Chalcogenide Semiconductor Thin Films
- Transition Metal Oxide Nanomaterials
Zhejiang University of Technology
2025
Ames National Laboratory
2015-2024
Iowa State University
2015-2024
Xinyang Normal University
2024
China Academy of Engineering Physics
2022
United States Department of Energy
2008-2021
NARI Group (China)
2019
Electric Power Research Institute
2019
Renmin University of China
2016
Universität Ulm
2012-2013
Abstract Silicon‐based anodes with high theoretical capacity have intriguing potential applications for next‐generation high‐energy lithium‐ion batteries, but suffer from huge volumetric change that causes pulverization of electrodes. Rational design and construction effective electrode structures combined versatile binders remain a significant challenge. Here, unique natural binder konjac glucomannan (KGM) is developed an amorphous protective layer SiO 2 fabricated on the surface Si...
Metal intercalation of graphene is a promising method to tune its electronic band structure and generate novel topological phases. The tuning depends critically on the ability bond intercalated atoms at predesigned, subsurface interlayer locations because emerging metal location. We have studied Dy under single-layer (SLG) SiC using spot profile analysis--low-energy electron diffraction scanning tunneling microscopy (STM). experimental work complemented with density-functional theory (DFT)...
Abstract Precision of scanning tunneling microscopy (STM) enables control matter at scales single atoms. However, transition from atomic-scale manipulation strategies to practical devices encounters fundamental problems in protection the designer structures formed atop surface. In this context, STM subsurface on technologically relevant materials is encouraging. Here, we propose a material platform and protocols for precise buried graphene interface. We show that an electric field tip...
Highly refined capabilities of the shape-controlled solution-phase synthesis metal nanocrystals (NCs) allow generation NCs with faceted nonequilibrium shapes, which optimize properties for target applications such as catalysis and plasmonics. Often, also TEM analysis, are removed from environment. We explore postsynthesis evolution these metastable in a high-vacuum Specifically, we analyze their reshaping toward equilibrium Wulff shapes mediated by surface diffusion, where degrades...
A one-pot oxidation from cyclohexane to adipic acid has been developed, catalyzed by Fe−porphyrin in the presence of molecular oxygen without any additives. When reaction temperature is 140 °C, pressure 2.5 MPa, concentration catalyst 1.33 × 10-5 mol %, and time 8 h, yield reaches 21.4%. turnover number about 24582 thus far highest one among those reported for direct acid.
Effects of quantum confinement electrons in metal nanofilms are analyzed using a noninteracting electron-gas model. Electrons confined within potential well with infinite-height barrier. The positions the barrier at fixed distance away from geometric boundaries film such that surface-charge neutrality requirement is maintained bulk limit. model predicts oscillations basic physical properties as Fermi energy, electron density, surface free and dipole layer moment function thickness. We...
Deposition of Bi on InSb(111)B reveals a striking Sierpi\ifmmode \acute{n}\else \'{n}\fi{}ski-triangle (ST)-like structure in thin films. Such fractal geometric topology is further shown to turn off the intrinsic electronic film. Relaxation huge misfit strain about 30% 40% between adlayer and substrate revealed drive ST-like island formation. A Frenkel-Kontrova model developed illustrate enhanced relief ST islands offsetting additional step energy cost. Besides sufficiently large tensile...
The electronic properties of two-dimensional (2D) material systems strongly depend on their atomic arrangement, so validating the structure an experimentally fabricated 2D system is important task for researchers. First-principles density-functional theory (DFT) used to analyze about 100 configurations Pb intercalated under buffer-layer graphene SiC(0001). These are constructed by using seven different types supercells corresponding varying strain. By comparing chemical potentials...
Using scanning tunneling microscopy, we demonstrate that the nucleation density of Fe islands on surface nanoscale Pb films oscillates with film thickness, providing a direct manifestation quantum size effect diffusion. The adatom diffusion barriers were derived to be 204+/-5 and 187+/-5 meV 21 26 monolayer (ML) film, respectively, by matching kinetic Monte Carlo simulations experimental island densities. is further illustrated growth wedged films, where consistently higher odd-layer than...
Well-defined Pt nanoparticles encapsulated in mesoporous silica allow us to demonstrate the transformation mechanism/kinetics from monometallic intermetallic PtSn.
Controlling the surface composition of shaped bimetallic nanoparticles could offer precise tunability geometric and electronic structure for new nanocatalysts. To achieve this goal, a platform studying intermixing process in nanoparticle was designed, using multilayered Pd-Ni-Pt core-shell nanocubes as precursors. Under mild conditions, between Ni Pt be tuned by changing layer thickness number, triggering while preserving shape. Intermixing two metals is monitored transmission electron...
We studied the mechanism underlying solid-phase adsorption of a heavy rare-earth element (HREE, Yb) from acidic solutions employing MCM-22 zeolite, serving as both layered synthetic clay mimic and new platform for mechanistic study HREE on aluminosilicate materials. Mechanistic studies revealed that Yb(III) at surface site occurs primarily through electrostatic interaction between species. The dependence Yb pH solution indicated role charge, content framework Al suggested Brønsted acid sites...
Stochastic lattice-gas models provide the natural framework for analysis of surface diffusion-mediated evolution crystalline metal nanostructures on appropriate time scale (often 101–104 s) and length scale. Model behavior can be precisely assessed by kinetic Monte Carlo simulation, typically incorporating a rejection-free algorithm to efficiently handle broad range Arrhenius rates hopping atoms. The model should realistically prescribe these rates, or associated barriers, diversity local...
In this paper, we demonstrate how a silver dendrite transforms from mesocrystal into single crystal and the stability for dendritic within Sn∕AgNO3 galvanic replacement reaction. Our findings provide direct evidence visible picture of transformation to crystalline structure further confirm particle-mediated crystallization mechanism. At initial stage transformation, there is crystallographic fusion process, dominated by oriented attachment Ostwald ripening also plays an important role in...
Far-from-equilibrium shape and structure evolution during formation post-assembly sintering of bimetallic nanoclusters is extremely sensitive to the periphery diffusion intermixing kinetics. Precise characterization many distinct local-environment-dependent barriers achieved for epitaxial using density functional theory assess interaction energies both with atoms at adsorption sites transition states. Kinetic Monte Carlo simulation incorporating these then captures on appropriate time scale...
We present an extensive experimental study of the conditions under which Cu forms encapsulated islands top surface layers graphite, as a result physical vapor deposition on argon-ion-bombarded graphite. When substrate is held at 800 K during deposition, are optimal for formation multilayer islands. Deposition temperatures below 600 favor adsorbed clusters, while above different type feature that probably single-layer intercalated island. The characterized with respect to size and shape,...
Here, we report a study on the radiation resistance enhancement of Gd2Zr2O7 nanograin ceramics, in which amorphization, cell volume expansion and multi-stage helium (He) bubble formation are investigated discussed. ceramics with series grain sizes (55-221 nm) were synthesized irradiated by 190 keV He ion beam up to fluence 5x10^17 ions/cm2. Both degree post irradiation amorphization fraction appear be size dependent. As average evolves from 55 221 nm, increases 0.56 1.02 %, 6.8 11.1 %....