Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (04): 933-938.doi: 10.3866/PKU.WHXB20100419

• CATALYSIS AND SURFACE STRUCTURE • Previous Articles     Next Articles

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

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

MSC2000: 

  • O647