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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents



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ID: 421810.0, Fritz-Haber-Institut / Inorganic Chemistry
Synthesis of Thermally Stable and Highly Active Bimetallic Au−Ag Nanoparticles on Inert Supports
Authors:Liu, Xiaoyan; Wang, Aiqin; Yang, Xiaofeng; Zhang, Tao; Mou, Chung-Yuan; Su, Dang Sheng; Li, Jun
Language:English
Research Context:HRTEM on catalysts
Date of Publication (YYYY-MM-DD):2009-01-27
Title of Journal:Chemistry of Materials
Journal Abbrev.:Chem. Mater.
Volume:21
Issue / Number:2
Start Page:410
End Page:418
Copyright:© 2008 American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:A general two-step approach has been developed for the synthesis of very small and sintering-resistant bimetallic gold−silver nanoparticles on inert supports including commercial silica and alumina. In this approach, gold particles were formed in the first step on amino-functionalized silica or alumina support. Our density functional theory (DFT) calculations on selected model clusters show that the surface atoms of the gold particles formed in the first step carry slightly negative charges, which facilitates the subsequent Ag+ adsorption on the gold particle surface. Upon Ag+ adsorption and reduction by NaBH4 in the second step, specific nanoparticles with gold−silver alloy core and a silver nanoshell have been formed, as confirmed by our ultraviolet−visible spectroscopy (UV−vis), high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS) characterizations. Such particles have been found to be highly thermally stable, and their sizes remain substantially unchanged (3 nm) even upon calcination in air at 500 °C. After the final reduction treatment in H2, a randomly distributed alloy composed of gold and silver is formed, and the resultant Au−Ag alloy particles are highly catalytically active for CO oxidation, even superior to Au/TiO2. The role of Ag in stabilizing the particles has been discussed.
Free Keywords:Au-Ag nanoparticles; Al; Si; Amino functionalization; DFT; UV-vis; XRD; HRTEM
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Micro- and Nanostructure / Carbon
External Affiliations:State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, P. R. China,
Graduate University of the Chinese Academy of Sciences, Beijing 100049, P. R. China, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China,
Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
Identifiers:URL:http://dx.doi.org/10.1021/cm8027725 [only for subscriber]
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