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题名: Synthesis of Thermally Stable and Highly Active Bimetallic Au-Ag Nanoparticles on Inert Supports
作者: Liu, Xiaoyan1, 2;  Wang, Aiqin1;  Yang, Xiaofeng1, 2, 3;  Zhang, Tao1;  Mou, Chung-Yuan4;  Su, Dang-Sheng5;  Li, Jun3
通讯作者: 张涛
刊名: CHEMISTRY OF MATERIALS
发表日期: 2009-01-27
DOI: 10.1021/cm8027725
卷: 21, 期:2, 页:410-418
收录类别: SCI
文章类型: Article
部门归属: 15
项目归属: 1501
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Materials Science
英文摘要: 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 NaBH(4) 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 (similar to 3 nm) even upon calcination in air at 500 degrees C. After the final reduction treatment in H(2), 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/TiO(2). The role of Ag in stabilizing the particles has been discussed.
关键词[WOS]: CO OXIDATION ACTIVITY ;  GOLD NANOPARTICLES ;  CATALYTIC-ACTIVITY ;  MESOPOROUS SILICA ;  SILVER NANOPARTICLES ;  ALLOY NANOPARTICLES ;  LOW-TEMPERATURES ;  PHASE SYNTHESIS ;  OXYGEN ;  SURFACE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000262605200031
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/101695
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China
4.Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan
5.Max Planck Soc, Fritz Haber Inst, D-14195 Berlin, Germany

Recommended Citation:
Liu, Xiaoyan,Wang, Aiqin,Yang, Xiaofeng,et al. Synthesis of Thermally Stable and Highly Active Bimetallic Au-Ag Nanoparticles on Inert Supports[J]. CHEMISTRY OF MATERIALS,2009,21(2):410-418.
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