A5064468010- nanoparticles nucleation surface interactions
- Catalytic Processes in Materials Science
- Electron and X-Ray Spectroscopy Techniques
- Advanced Electron Microscopy Techniques and Applications
- Advanced Chemical Physics Studies
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanocluster Synthesis and Applications
- Graphene research and applications
- Electrocatalysts for Energy Conversion
- Fullerene Chemistry and Applications
- Surface and Thin Film Phenomena
- Ion-surface interactions and analysis
- Molecular Junctions and Nanostructures
- Nanomaterials for catalytic reactions
- Corrosion Behavior and Inhibition
- Quantum Dots Synthesis And Properties
- Machine Learning in Materials Science
- Copper-based nanomaterials and applications
- Semiconductor materials and interfaces
- Nanowire Synthesis and Applications
- Catalysis and Oxidation Reactions
- Advanced Condensed Matter Physics
- Semiconductor materials and devices
- Theoretical and Computational Physics
- Laser-Ablation Synthesis of Nanoparticles
China Southern Power Grid (China)
2023-2025
Universitat de Barcelona
2025
Technical University of Denmark
2021-2024
Jiangsu University of Science and Technology
2023
University of Birmingham
2012-2022
University of Chinese Academy of Sciences
2021
Institute of Process Engineering
2021
Sino-Danish Centre for Education and Research
2021
China University of Mining and Technology
2018-2019
University of Science and Technology of China
2018
Neutron scattering has been used to study the magnetic correlations and long wavelength spin dynamics of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ in ferromagnetic regime $(0\ensuremath{\le}x<\frac{1}{2})$. For $x\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\frac{1}{3}$ $({T}_{C}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}250\mathrm{K})$ where magnetoresistance effects are largest system behaves as an ideal isotropic ferromagnet at low $T$, with a...
In order to determine the possibilities control chemical configuration of bimetallic nanoparticles, we have considered CuAg nanoparticles synthesized by a physical route as model in this study. The synthesis was made pulsed laser deposition under ultra-high vacuum conditions, via sequential procedure. We show that temperature substrate and absolute quantity Ag particle are main parameters drive configuration. To explain transition from core–shell Janus function quantity, conducted...
Abstract Controlled growth of far-from-equilibrium-shaped nanoparticles with size selection is essential for the exploration their unique physical and chemical properties. Shape control by wet-chemistry preparation methods produces surfactant-covered surfaces limited understanding due to complexity processes involved. Here, we report controlled production transformation octahedra tetrahedra size-selected platinum nanocrystals clean in an inert gas environment. Molecular dynamics simulations...
Three types of bimetallic AgAu nanoparticles, with mean size 4-5 nm, Ag(core)Au(shell), Au(core)Ag(shell) and alloyed AgAu, have been synthesized using an inverse micelle method. To image these small quantitative high angle annular dark field imaging scanning transmission electron microscopy was successfully applied. Our results show that good control nanoparticle dispersion composition modulation achieved. Optical properties the nanoparticles are correlated direct internal structure...
This paper describes a new approach of quantification annular-dark-field or $Z$-contrast image intensity as function inner acceptance angle the detector in scanning transmission electron microscope. By using size-selected nanoclusters Pd ($Z$ = 46) and Au 79), it is shown experimentally that exponent power law $I$ $\ensuremath{\sim}$ ${Z}^{\ensuremath{\alpha}}$ varies strongly between 1.2 1.8 collection changes from 14 to 103 mrad. The result discussed line with existing theoretical models....
An <italic>In situ</italic> atomic scale study of the surface oxidation Pd nanocrystals.
A method for the preparation of smooth deposits Pt on Au nanorods is described, involving sequential deposition steps with selective blocking surface sites that reduces Pt-on-Pt deposition. The Au-Pt prepared by this have higher long-term stability than those standard Electrochemical data show resulting structure has more extended regions and enhanced activity toward carbon monoxide oxidation oxygen reduction reactions.
Here we report on the synthesis of novel dendritic Pt3Cu triangular pyramid caps via a solvothermal coreduction method. These had three-dimensional caved structures with ultrathin branches, as evidenced by high-resolution transmission electron microscopy (HRTEM) and HAADF-STEM characterization. Tuning reduction kinetics two metal precursors an iodide ion was believed to be key for formation alloyed nanostructure. Electro-oxidation methanol formic acid showed dramatically improved...
We have investigated both the structures and excitation spectra produced by submonolayer adsorption of potassium on surface graphite at 90 K, using high-resolution low-energy electron diffraction in conjunction with electron-energy-loss spectroscopy. show that very low coverages a dispersed phase is formed giant K-K spacing (around 60 \AA{}); this continuously compresses increasing adatom density until critical coverage where close-packed structure nucleates. Below coverage, charge...
We present a new approach to quantify the mass and 3D shape of nanoparticles on supports, using size-selected nanoclusters as standards in scanning transmission electron microscope. Through quantitative image intensity analysis, we show that integrated high angle annular dark field intensities gold clusters soft-landed graphite display monotonic dependence cluster size far $\ensuremath{\sim}6500$ atoms. applied this standard study prepared by thermal vapor deposition colloidal wet chemistry,...
Metallurgical-grade silicon powder (10 m 2 /g surface area) has been porosified using a metal-assisted chemical etch process based on hydrofluoric acid-ferric chloride chemistry. By controlling the reagent concentrations and ratios, degree of porosification varied. Initiating reaction at temperatures below 0°C, typically between −15°C −25°C, yields etched powders with spectacularly increased area pore volume (porosity). The reduced temperature, its subsequent control, favors nucleation...
The energetics, structures and segregation of 98-atom AuPd nanoclusters are investigated using a genetic algorithm global optimization technique with the Gupta empirical potential (comparing three different parameterisations) followed by local minimizations Density Functional Theory (DFT) calculations. A shell program is employed in order to study energetics highly symmetric Leary Tetrahedron (LT) structure chemical ordering number structural motifs carried out Basin Hopping Monte Carlo...
Heterogeneous catalysis, which is widely used in the chemical industry, makes a great use of supported late-transition-metal nanoparticles, and bimetallic catalysts often show superior catalytic performances as compared to their single metal counterparts. In order optimize catalyst efficiency discover new active combinations, an atomic-level understanding control structure desirable. this work, catalytically AuRh nanoparticles prepared by colloidal methods immobilized on rutile titania...
The effect of supercritical drying (SCD) on the preparation porous silicon (pSi) powders has been investigated in terms photoluminescence (PL) efficiency. Since pSi contains closely spaced and possibly interconnected Si nanocrystals (&lt;5 nm), pore collapse morphological changes within nanocrystalline structure after common processes can affect PL We report highly beneficial effects using SCD for photoluminescent powders. Significantly higher surface areas volumes have realized by...
Abstract Ultra‐high‐voltage direct current wall bushings are critical components in transmission systems. Temperature variations and abnormal distributions can signal potential equipment failures that threaten system stability. Therefore, monitoring these multi‐point temperature is essential. However, the unique design of bushings, featuring insulation sheds periodic shape, distorts infrared measurements by introducing interference points. These points, dependent on measurement's angle...
Mass spectrometry of supported, monolayer-protected, nominally Au(38) (MP-Au(38)) clusters is performed via quantitative High Angle Annular Dark Field-Scanning Transmission Electron Microscopy (HAADF-STEM) using size-selected Au(N) (N = 25, 38, 55) as mass standards. With the intensity due to (presumed) 24 hexanethiolate ligands taken into account, are found contain 38 +/- 2 Au atoms. The method may also be used determine degree aggregation deposited nanoparticles.
Au, Rh, Pd, Au-Rh and Au-Pd nanoparticles (NPs) were synthesized by colloidal chemical reduction immobilized on hydrothermally-prepared rutile titania nanorods. The catalysts characterized aberration-corrected TEM/STEM, XPS, FTIR, evaluated in the hydrogenation of tetralin presence H2S. Oxidizing reducing thermal treatments employed to remove polyvinyl alcohol (PVA) surfactant. Reduction H2 at 350 °C was found efficient for removing PVA while preserving size (ca. 3 nm), shape bimetallic...
In this work we address the challenge of furthering our understanding driving forces responsible for metal–metal interactions in industrially relevant bimetallic nanocatalysts, by taking a comparative approach to atomic scale characterization two core–shell nanorod systems (AuPd and AuRh). Using aberration-corrected scanning transmission electron microscopy, show existence randomly mixed alloy layer some 4–5 layers thick between completely bulk immiscible Au Rh, which facilitates fully...