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Citation: Jing Li-Qiang, Sun Xiao-Jun, Cai Wei-Min, Zheng Da-Fang, Xu Yue, Xu Zhao-Peng, Xu Zi-Li, Du Yao-Guo. Study of SPS and XPS of Pd/ZnO and Ag/ZnO Composite Nanoparticles[J]. Acta Physico-Chimica Sinica, ;2002, 18(08): 754-758. doi: 10.3866/PKU.WHXB20020817 shu

Study of SPS and XPS of Pd/ZnO and Ag/ZnO Composite Nanoparticles

1.
Department of Environmental Sciences and Engineering, Harbin Institute of Technology, Harbin　150001;Analysis Testing and Experimental Center;Department of Environmental Sciences and Engineering, Jilin University, Changchun　130021

Received Date: 28 December 2001
Available Online: 15 August 2002

ZnO nanoparticles were prepared by calcining the precursor, zinc carbonate hydroxide,and Pd/ZnO and Ag/ZnO composite nanoparticles with the noble metal content of 0.5％(mass fraction) were obtained by photoreduction method. The as-prepared samples were also characterized by the XRD，TEM，XPS and SPS techniques, respectively. The results showed that the deposited noble metal of both Pd and Ag existed as the form of atomic clusters,and the possible reasons of forming the atomic clusters of noble metal on the surface of ZnO nanoparticles were primarily discussed. The intensity of SPS responses of ZnO nanoparticle remarkably decreased by depositing the appropriate noble metal on its surface. Moreover, Pd/ZnO and Ag/ZnO composite nanoparticles exhibited higher photocatalytic activity than ZnO nanoparticles in the experiment of photocatalytic oxidation of gas phase n-heptane. The essential reasons why the photocatalytic activity of ZnO nanoparticles improved by depositing noble metal Pd or Ag on its surface were also further discussed. In addition, the point was put forward that the photocatalytic activity of nanoparticle could be primarily evaluated by its SPS response, i.e., the weaker the SPS responseis, the higher the photoactivity.
- ZnO;Composite nanoparticles;SPS;XPS;Noble metal;Photocatalytic activity
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沈阳化工大学材料科学与工程学院沈阳 110142

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