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Synthesis of Thermally Stable and Highly Active Bimetallic Au-Ag Nanoparticles on Inert Supports
Liu, Xiaoyan1,2; Wang, Aiqin1; Yang, Xiaofeng1,2,3; Zhang, Tao1; Mou, Chung-Yuan4; Su, Dang-Sheng5; Li, Jun3; Zhang T(张涛)
刊名CHEMISTRY OF MATERIALS
2009-01-27
DOI10.1021/cm8027725
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
关键词[WOS]CO OXIDATION ACTIVITY ; GOLD NANOPARTICLES ; CATALYTIC-ACTIVITY ; MESOPOROUS SILICA ; SILVER NANOPARTICLES ; ALLOY NANOPARTICLES ; LOW-TEMPERATURES ; PHASE SYNTHESIS ; OXYGEN ; SURFACE
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.
语种英语
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WOS记录号WOS:000262605200031
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被引频次:184[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/101695
专题中国科学院大连化学物理研究所
通讯作者Zhang T(张涛)
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
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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.
APA Liu, Xiaoyan.,Wang, Aiqin.,Yang, Xiaofeng.,Zhang, Tao.,Mou, Chung-Yuan.,...&张涛.(2009).Synthesis of Thermally Stable and Highly Active Bimetallic Au-Ag Nanoparticles on Inert Supports.CHEMISTRY OF MATERIALS,21(2),410-418.
MLA Liu, Xiaoyan,et al."Synthesis of Thermally Stable and Highly Active Bimetallic Au-Ag Nanoparticles on Inert Supports".CHEMISTRY OF MATERIALS 21.2(2009):410-418.
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