物理化学学报 >> 2010, Vol. 26 >> Issue (04): 933-938.doi: 10.3866/PKU.WHXB20100419

催化和表面结构 上一篇    下一篇

酞菁氧钒分子及纳米簇在高定向石墨表面的自组装

王永锋, 张鑫然, 叶迎春, 梁德建, 王远, 吴凯   

  1. 北京大学化学与分子工程学院, 分子动态与稳态结构国家重点实验室, 北京分子科学国家实验室, 北京 100871
  • 收稿日期:2009-12-04 修回日期:2010-01-21 发布日期:2010-04-02
  • 通讯作者: 王远, 吴凯 E-mail:wangy@pku.edu.cn; kaiwu@pku.edu.cn

Self-Assemblies of Oxovanadium Phthalocyanine Molecules and Nanoclusters on Highly Oriented Pyrolytic Graphite

WANG Yong-Feng, ZHANG Xin-Ran, YE Ying-Chun, LIANG De-Jian, WANG Yuan, WU Kai   

  1. Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry &Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2009-12-04 Revised:2010-01-21 Published:2010-04-02
  • Contact: WANG Yuan, WU Kai E-mail:wangy@pku.edu.cn; kaiwu@pku.edu.cn

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摘要：

报导了酞菁氧钒(VOPc)分子及其纳米簇在高定向石墨(HOPG)表面的自组装. 在室温下, 将HOPG浸入含有VOPc纳米簇(2-20 nm)和VOPc分子(约为10-3 g·L-1)的1,2-二氯乙烷胶体溶液中, VOPc分子在HOPG表面自组装形成单分子层(SAM), VOPc纳米簇在上述SAM表面进行尺寸选择性自组装. 组装于VOPc单分子层表面的纳米簇的粒径为(4.60±0.47) nm. 扫描隧道显微镜研究表明, 随着酞菁氧钒胶体溶液浓度由2.5×10-2 g·L-1增至2.5×10-1 g·L-1, 组装于SAM表面的VOPc纳米粒子的数量逐渐增多, 最终形成稠密的单层粒子组装体. 本文提供的自组装结构及方法在发展光电功能体系等方面具有潜在应用价值.

关键词: 自组装, 酞菁氧钒, 纳米粒子, 高定向石墨, 扫描隧道显微镜, VOPc

Abstract:

Self-assembled monolayer (SAM) of oxovanadium phthalocyanine (VOPc), an organic semiconductor compound, was prepared at room temperature on a highly oriented pyrolytic graphite (HOPG) substrate by immersing the substrate in a 1,2-dichloroethane (C2H4Cl2) colloidal solution containing both VOPc nanoparticles (2-20 nm) and dissolved VOPc molecules (ca 10-3 g·L-1). The VOPc nanoparticles further assembled on the VOPc SAM. The nanoparticle-assembling in the experimental conditions exhibited a high size-selectivity to VOPc nanoparticles of (4.60±0.47) nm with a standard deviation of 10%. As revealed by scanning tunneling microscopy (STM) measurements, with increasing VOPc concentration of the colloidal solution from 2.5 ×10-2 to 2.5 ×10 -1 g·L-1, the amount of VOPc nanoparticles assembled on the molecular layer increased gradually, and a dense VOPc nanoparticle monolayer formed in the end. The found assembly structures and method are promising for the development of photoelectric or electric functional systems.

Key words: Self-assembly, Oxovanadiumphthalocyanine, Nanoparticles, HOPG, Scanning tunneling microscopy, VOPc