Citation:
WANG Yong-Feng, ZHANG Xin-Ran, YE Ying-Chun, LIANG De-Jian, WANG Yuan, WU Kai. Self-Assemblies of Oxovanadium Phthalocyanine Molecules and Nanoclusters on Highly Oriented Pyrolytic Graphite[J]. Acta Physico-Chimica Sinica,
;2010, 26(04): 933-938.
doi:
10.3866/PKU.WHXB20100419
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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.
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