物理化学学报 >> 2002, Vol. 18 >> Issue (08): 754-758.doi: 10.3866/PKU.WHXB20020817

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Pd/ZnO和Ag/ZnO复合纳米粒子的SPS和XPS研究

井立强;孙晓君;蔡伟民;郑大方;徐跃;徐朝鹏;徐自力;杜尧国   

  1. 哈尔滨工业大学环境科学与工程系，哈尔滨　150001;吉林大学分析测试实验中心;吉林大学环境科学与工程系，长春　130023
  • 收稿日期:2001-12-28 修回日期:2002-03-04 发布日期:2002-08-15
  • 通讯作者: 井立强 E-mail:JLQiang@sohu.com

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

Jing Li-Qiang;Sun Xiao-Jun;Cai Wei-Min;Zheng Da-Fang;Xu Yue;Xu Zhao-Peng;Xu Zi-Li;Du Yao-Guo   

  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:2001-12-28 Revised:2002-03-04 Published:2002-08-15
  • Contact: Jing Li-Qiang E-mail:JLQiang@sohu.com

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摘要： 用焙烧前驱物碱式碳酸锌的方法制备了ZnO纳米粒子，采用光还原沉积贵金属的方法分别得到了质量分数为0.5％的Pd/ZnO和Ag/ZnO复合纳米粒子，并利用XRD、TEM、XPS和SPS等测试技术对样品进行表征.初步探讨了贵金属在ZnO纳米粒子表面形成原子簇的原因及沉积贵金属对ZnO纳米粒子表面光电压信号的影响.以光催化氧化气相正庚烷为模型反应，考察了沉积贵金属对ZnO纳米粒子光催化活性的影响，并探讨了光催化活性有所提高的内在原因.结果表明， ZnO纳米粒子沉积贵金属后，其表面光电压信号明显下降，而光催化活性却大大地提高，这说明可以通过表面光电压谱的测试来初步的评估纳米粒子的光催化活性，即粒子的表面光电压信号越弱，其光催化活性越高.

关键词: ZnO, 复合纳米粒子, SPS（表面光电压谱）, XPS, 贵金属, 光催化活性

Abstract: 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.

Key words: ZnO, Composite nanoparticles, SPS, XPS, Noble metal, Photocatalytic activity