Electronic structure of nanoscale Cu/Pt alloys: A combined X-ray diffraction and X-ray absorption investigations

被引:5
作者
Chen, Xing
Chu, Wangsheng
Cai, Quan
Xia, Dingguo
Wu, Zhonghua
Wu, Ziyu [1 ]
机构
[1] Chinese Acad Sci, Beijing Synchrotron Radiat Facil, Inst High Energy Phys, Beijing 100864, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 1000864, Peoples R China
[3] Univ Sci & Technol China, Hefei 230036, Peoples R China
[4] Beijing Univ Technol, Coll Environm & Energy Engn, Beijing 100022, Peoples R China
基金
中国国家自然科学基金;
关键词
Cu/Pt clusters; transmission electron microscopy; X-ray diffraction; X-ray absorption near-edge structure;
D O I
10.1016/j.radphyschem.2005.11.010
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
PVP-protected Cu/Pt clusters were prepared by glycol/water reduction method and characterized with transmission electron microscopy (TEM), X-ray diffraction (XRD) and absorption spectra. TEM and XRD analysis show that the Cu/Pt clusters with different molar ratio have fcc structure with particle size of about 4 nm, while the lattice parameters in these clusters reduce with increasing Cu concentration. From the X-ray absorption near edge structure (XANES) at Cu-K edge and Pt-L-2,L-3 edge, we demonstrate that the d-electronic states of Cu and Pt are affected by the local environment as a function of Cu/Pt molar ratio. With increasing Cu concentration, Pt loses a fraction of 5d electrons and the hybridization between p- and d-states at Cu sites is enhanced. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1622 / 1625
页数:4
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