Au-Ag alloy nanostructures with various shapes were synthesized using a successive reduction method in this study. By means of galvanic replacement, twined Ag nanoparticles (NPs) and single-crystalline Ag nanowires (NWs) were adopted as templates, respectively, and alloyed with the same amount of Au(+) ions. High angle annular dark field-scanning TEM (HAADF-STEM) images observed from different rotation angles confirm that Ag NPs turned into AuAg alloy rings with an Au/Ag ratio of 1. The shifts of surface plasmon resonance and chemical composition reveal the evolution of the alloy ring formation. On the other hand, single-crystalline Ag NWs became Ag@AuAg core-shell wires instead of hollow nanostructure through a process of galvanic replacement. It is proposed that in addition to the ratio of Ag templates and Au ion additives, the twin boundaries of the Ag templates were the dominating factor causing hollow alloy nanostructures.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4644130 | PMC |
| http://dx.doi.org/10.1186/s11671-015-1141-7 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Tailoring a High Loading Atomic Zinc with Weak Binding to Sodium Toward High-Energy Sodium Metal Batteries.
Small
January 2025
Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian, 350117, China.
Single-atom materials provide a platform to precisely regulate the electrochemical redox behavior of electrode materials with atomic level. Here, a multifield-regulated sintering route is reported to rapidly prepare single-atom zinc with a very high loading mass of 24.7 wt.
View Article and Find Full Text PDFEnhanced Structure Stability of Au Nanobipyramids by an Customized Silver Armor.
Nano Lett
January 2025
School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China.
Revealing the structure stability and evolution of gold nanocrystals at the atomic scale is crucial to their versatile applications; however, the fundamental mechanism remains elusive due to the lack of characterizations. In this work, the structural evolution of two types of Au nanobipyramids (Au NBPs) at elevated temperatures is monitored through electron microscopy analysis, and there is a sharp distinction between their structure stability despite that they possess the same crystalline structure. Detailed material characterization reveals that the surface alloying of residual Ag with Au (customized Ag armor) can greatly inhibit the Au atom diffusion and contribute remarkably to the stability and surface-enhanced Raman scattering improvement.
View Article and Find Full Text PDFDislocation Density in Ceramics Processed by Severe Plastic Deformation via High-Pressure Torsion.
Materials (Basel)
December 2024
Laboratory of Metals and Alloys Under Extreme Impacts, Ufa University of Science and Technology, 32 Zaki Validi str., Ufa 450076, Russia.
This study investigates the dislocation density in ceramics processed by severe plastic deformation at room and elevated temperatures via high-pressure torsion (HPT) for various numbers of turns and shear strains. Ceramics, characterized by ionic or covalent bonding, typically exhibit brittleness due to limited dislocation activity. However, HPT enables significant microstructural transformations in ceramics including dislocation nucleation and accumulation.
View Article and Find Full Text PDFNiMo-C Coatings Synthesized by Reactive Magnetron Sputtering for Application as a Catalyst for the Hydrogen Evolution Reaction in an Acidic Environment.
ACS Appl Mater Interfaces
January 2025
Institute of Experimental Physics, Faculty of Mathematics Physics and Informatics, University of Gdańsk, Wita Stwosza 57, Gdańsk 80-308, Poland.
This study examines the structure and properties of NiMo-C coatings synthesized via reactive magnetron sputtering of a NiMo alloy target in an argon/acetylene atmosphere. The coating structure evolves with carbon content from nanocrystalline, through amorphous to quasi-amorphous with a nanocolumnar structure. The nanostructure consists of metallic columns perpendicular to the substrate surrounded by an amorphous carbon shell.
View Article and Find Full Text PDFSelf-Etching Pd-Pb Nanoparticles with Controllable Tensile Strain for C Alcohol Oxidation.
ACS Appl Mater Interfaces
December 2024
Institute of Materials for Energy and Environment, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, PR China.
Pd-based nanocatalysts hold significant promise for application in alkaline direct ethanol fuel cells (DEFCs). To address the challenges of low Pd atom utilization and poor reaction kinetics in conventional Pd-based catalysts, a self-etching strategy has been developed to synthesize PdPb nanoparticles (NPs) with tunable size and abundant tensile strain. The nanoparticles demonstrated a markedly enhanced electrocatalytic performance.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!