Applied Surface Science, Vol.255, No.11, 5885-5890, 2009
First self-assembly study of large pi-conjugated corrole dimers on solid substrates
Our study focus on beta, beta'-doubly linked corrole dimers (CDs) on mica and Au(1 1 1) surface using samples prepared by the synthetic method described by Osuka group appeared on recent publication [S. Hiroto, K. Furukawa, H. Shinokubo, A. Osuka, J. Am. Chem. Soc. 128 (2006) 12380]. Atomic force microscopy (AFM) and scanning tunneling microscopy (STM) were used to investigate the self-assembled structure of corrole dimers adsorbed on mica and Au(1 1 1) surfaces respectively at room temperature in air. The CDs adopt a dissimilar adsorption modality due to the different surface free energy of the different substrates. These types of molecular layers provide a useful platform for the study of surface and interface phenomena outside a vacuum system. It is potentially useful for practical fabrication of molecular devices because of the simplicity of the sample preparation and the stability of the interface in ambient conditions. (C) 2009 Elsevier B. V. All rights reserved.
Keywords:Scanning tunneling microscope;Atomic force microscope;Corrole dimer;Self-assemble;Aggregation;Hydrogen bonding