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《Chinese Journal of Catalysis》 2007-04
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Atomic Force Microscopy Study of Nanostructure of Pt Loaded on TiO_2 Fiber

ZHOU Xuefeng1,LI Wei1,ZHENG Zhong1,HE Ming2,YANG Zhuhong1,FENG Xin1,LU Xiaohua1(1 College of Chemistry and Chemical Engineering,Nanjing University of Technology,Nanjing 210009,Jiangsu,China;2 Information College of Science and Technology,Nanjing Forestry University,Nanjing 210037,Jiangsu,China)  
The surface topography and structure of platinum loaded on TiO2 fiber were investigated by atomic force microscopy.The micron-sized platinum domains were rectangle-like on the TiO2 fiber with low content of Pt but were hexagon-like on the TiO2 fiber with high content of Pt.The topography of Pt domains on TiO2 fiber was similar to Pt nanocluster on TiO2(110),but the size of Pt domains was obviously larger.The specific topography of Pt domains and the ordered distribution of nano-crystals of TiO2 fiber implied that there was a strong metal-support interaction between Pt and TiO2 fiber.There were many terraces on the Pt domains,and the height of terraces mainly ranged from two to four times the interplanar distance of Pt(111).Moreover,the specific surface area of Pt/TiO2 fiber was almost unchanged before and after the loading of Pt.The strong metal-support interaction and the terrace structure of Pt might be the reasons that the photocatalytic activity of Pt/TiO2 fiber was high although the Pt was micron-sized domains.
【Key Words】: platinum titanium oxide fiber atomic force microscopy photocatalysis surface terrace
【Fund】: 国家自然科学基金(20246002 20236010 20676062);; 国家杰出青年科学基金海外合作基金(20428606);; 国家重点基础研究发展计划(973计划 2003CB615700);; 江苏省自然科学重点基金(BK2004215);; 江苏省自然科学基金(BK2002016)
【CateGory Index】: O614.826
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