酞菁氧钒分子及纳米簇在高定向石墨表面的自组装(英文)

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

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(2-20nm)和VOPc分子(约为10-3g·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2.5×10-2g·L-1增至2.5×10-1g·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.

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 10-3g·L-1）.The VOPc nanoparticles further assembled on the VOPc SAM.The nanoparticleassembling 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.