A5100633389- Catalytic Processes in Materials Science
- Advanced Photocatalysis Techniques
- Nanomaterials for catalytic reactions
- Electrocatalysts for Energy Conversion
- Catalysts for Methane Reforming
- Catalysis and Oxidation Reactions
- Aluminum Alloys Composites Properties
- TiO2 Photocatalysis and Solar Cells
- Copper-based nanomaterials and applications
- Advanced ceramic materials synthesis
- Microwave Imaging and Scattering Analysis
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanowire Synthesis and Applications
- Carbon dioxide utilization in catalysis
- nanoparticles nucleation surface interactions
- Photoacoustic and Ultrasonic Imaging
- Ultrasonics and Acoustic Wave Propagation
- Catalysis and Hydrodesulfurization Studies
- Thermal properties of materials
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and devices
- Metal and Thin Film Mechanics
- Catalysis for Biomass Conversion
- Microstructure and mechanical properties
- Advanced materials and composites
Shanghai University of Engineering Science
2016-2025
Jishou University
2025
Jilin University
2015-2024
Chang'an University
2010-2024
Hohai University
2023-2024
Zhejiang Shuren University
2020-2024
Nanjing Forestry University
2024
The University of Texas at Dallas
2014-2023
Shandong Academy of Sciences
2021-2023
Qilu University of Technology
2021-2023
This paper describes a simple and versatile method for growing highly anisotropic nanostructures of Pd, single-crystal nanobars bounded by {100} facets nanorods with their side surfaces enclosed {110} facets. According to thermodynamic arguments, Pd atoms should nucleate grow in solution phase form cuboctahedrons spherical shape mix {111} Anisotropic can only under kinetically controlled conditions, while the cubic symmetry is broken. In present system, we found that one-dimensional growth...
Nanoscale Pt-Ni bimetallic octahedra with controlled sizes have been actively explored in recent years owning to their outstanding activity for the oxygen reduction reaction (ORR). Here we report synthesis of uniform 9 nm use oleylamine and oleic acid as surfactants W(CO)6 a source CO that can promote formation {111} facets presence Ni. Through introduction benzyl ether solvent, coverage both on surface resultant was significantly reduced while octahedral shape still attained. By further...
An effective strategy for reducing the Pt content while retaining activity of a Pt-based catalyst is to deposit atoms as ultrathin skins only few atomic layers thick on nanoscale substrates made another metal. During deposition, however, often take an island growth mode because strong bonding between atoms. Here we report versatile route conformal deposition uniform, shells Pd nanocubes in solution phase. The introduction precursor at relatively slow rate and high temperature allowed...
This article describes a systematic study of the galvanic replacement reaction between PtCl62− ions and Pd nanocrystals with different shapes, including cubes, cuboctahedrons, octahedrons. It was found that Br− played an important role in initiating, facilitating, directing reaction. The presence led to selective initiation from {100} facets nanocrystals, likely due preferential adsorption on this crystallographic plane. site-selective resulted formation Pd−Pt bimetallic concave structure...
Controlling the shape or morphology of metal nanocrystals is central to realization their many applications in catalysis, plasmonics, and electronics. In one approaches, are grown from seeds certain crystallinity through addition atomic species. this case, manipulating rates at which species added onto different crystallographic planes a seed has been actively explored control growth pattern thereby taken by final product. Upon deposition, however, adsorbed atoms (adatoms) may not stay same...
The dissociation process of glutathione−gold(I) polymers in aqueous solution resulted the formation a class ∼2 nm gold nanoparticles. Different from same sized but NaBH4 reduced nanoparticles, these nanoparticles exhibited strong luminescence no surface plasmon absorption. Luminescence lifetimes were found strongly dependent on excitation wavelengths, and singlet triplet excited states involving emission degenerate energy. X-ray photoelectron spectroscopic studies showed that nearly 40−50%...
This paper describes the synthesis of Pd−Au bimetallic nanocrystals with controlled morphologies via a one-step seeded-growth method. Two different reducing agents, namely, l-ascorbic acid and citric acid, were utilized for reduction HAuCl4 in an aqueous solution to control overgrowth Au on cubic Pd seeds. When was used as agent, conformal nanocubes led formation core−shell structure. On contrary, localized observed when producing dimers. Through this morphological control, we able tune...
The art of addition and subtraction: By confining the nucleation growth Rh atoms only to corners edges Pd cubic seeds, Pd-Rh core–frame nanocrystals were obtained with concave side faces. cores then selectively removed by oxidative etching generate nanoframes a highly open structure (see picture). Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted authors. Please...
This article describes a new method for the facile synthesis of Pd–Pt alloy nanocages with hollow interiors and porous walls by using Pd nanocubes as sacrificial templates. Differing from our previous work (Zhang, H.; Jin, M. S.; Wang, J. G.; Li, W. Y.; Camargo, P. H. C.; Kim, J.; Yang, D. R.; Xie, Z. X.; Xia, Y. Synthesis Pd-Pt Bimetallic Nanocrystals Concave Structure through Bromide-Induced Galvanic Replacement Reaction. Am. Chem. Soc.2011, 133, 6078–6079), we complemented galvanic...
An epitaxial route to strain Strain can have a dramatic effect on the properties of materials. Zhang et al. introduced large in material PbTiO 3 by growing it epitaxially composite with PbO. On boundaries between two materials, their normally different lattice constants were matched, giving rise strain. As consequence, films exhibited very electric polarization even absence an field. The method may be applicable generating other functional Scence , this issue p. 494
We systematically evaluated two different approaches to the syntheses of Pd@PtnL (n = 2-5) core-shell octahedra. initially prepared octahedra using a polyol-based route by titrating Pt(IV) precursor into growth solution containing Pd octahedral seeds at 200 °C through use syringe pump. The number Pt atomic layers could be precisely controlled from five increasing volume while fixing amount seeds. then demonstrated synthesis water-based 95 one-shot injection Pt(II) precursor. Due large...
Mechanistic insight and catalyst screening of C<sub>2</sub>N-graphene supported single-atom catalysts for CO<sub>2</sub> electrochemical reduction reaction are provided from a theoretical perspective.
Metallic nanowires (Au, Ag, Cu, Ni, Co, and Rh) with an average diameter of 40 nm a length 3-5 μm have been fabricated by electrodeposition in the pores track-etched polycarbonate membranes. Structural characterizations transmission electron microscopy (TEM) diffraction showed that Au, Cu are single-crystalline preferred [111] orientation, whereas Rh wires polycrystalline. Possible mechanisms responsible for nucleation growth single-crystal noble metals versus polycrystalline group VIII-B discussed.
Pd−Pt core−shell nanoplates with hexagonal and triangular shapes were synthesized through the heterogeneous, epitaxial growth of Pt on Pd nanoplates. The by reducing Na2PdCl4 precursor PVP as a agent, which then served seeds for nucleation atoms formed H2PtCl6 citric acid. Characterization as-prepared scanning transmission electron microscopy high-resolution reveals that thin, uniform shell was around nanoplate, demonstrating layer-by-layer surface in this approach. close lattice match...
This communication describes a simple route to Ag nanoplates by slowing the polyol reduction of silver nitrate with polyacrylamide (PAM). In addition its role as stabilizer for colloids, amino groups PAM can form complexes Ag+ ions in solution substantially reducing rate, leading formation thin nanoplates.
Wurtzite (w-) ZnS nanowires with nearly square cross sections have been grown by pulsed laser vaporization of a (ZnS)0.9Au0.1 target in flow Ar 5%H2. Growth proceeds the vapor−liquid−solid mechanism. Raman scattering from air at room temperature reveals strong first-order longitudinal optic (LO) phonon (346 cm-1) and two transverse (TO) phonons (269 282 cm-1), as well several second-order features. Peak assignments based on bulk can be made for all first- features, except one band located...
The growth of metal nanowires using membranes as hard templates is reviewed. method provides access to arrays single-crystal and quasi-one-dimensional nanostructures with controlled compositional variation along their length. Recent applications these kinds problems in superconductivity, optical spectroscopy sensing, catalytic conversion chemical mechanical energy are
A new non-hydrolytic approach was developed to synthesize anatase TiO2 nanocrystals with dominant {001} facets by solvothermal alcoholysis of TiF4, which relatively green since the direct use HF avoided and less released from alcoholysis. These displayed uniform shape could be easily controlled owing smooth process. Using tert-butanol as initial alcohol source, total surface area 103 m2 g−1 small crystal sizes around 23 nm. By changing different alcohols, both percentage exposed particle...
Electrical transport measurements were made on single-crystal $\mathrm{Sn}$ nanowires to understand the intrinsic dissipation mechanisms of a one-dimensional superconductor. While resistance wires diameter larger than $70\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ drops precipitously zero at ${T}_{c}$ near $3.7\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, residual resistive tail extending down low temperature is found for with diameters 20 and $40\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. As function...
The oxygen reduction reaction (ORR) on the cathode of a polymer electrolyte fuel cell requires use catalyst based Pt, one most expensive metals earth. A number strategies, including optimization shape or facet, formation alloys with other metals, and incorporation different metal into core, have been investigated to enhance activity Pt-based thus reduce loading Pt. This article reports synthesis characterization Pd@Pt–Ni core–shell octahedra high toward ORR. an edge length 8 nm were obtained...