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Updated: Jun 17, 2026
Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
Published on: February 27, 2015
Substrate-induced varied conformation and molecular assemblies: in situ STM observation of beta-substituted
Li Wang1, Bernard John V Tongol, Shueh-Lin Yau
1Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-yama 04, Sendai 980-8579, Japan. lwang@jxnu.edu.cn
Abstract:
The adsorption of 3,3'''-dihexyl-2,2':5',2'':5'',2'''-quaterthiophene (4T) molecules on an Au(111) electrode was examined by using in situ scanning tunneling microscopy in 0.10 M HClO(4), revealing internal molecular structures of the tetrathiophene backbones and the hexyl side chains. The 4T admolecules were packed in lamellae with their molecular axis aligned along the main axis of the Au(111) substrate and their hexyl side chains interdigitated to enhance intermolecular interaction. Dynamics of molecular organization incurred by the shifting of potential was also observed in this study. By examining and comparing the adsorption of 4T on HOPG and Au(111), we address the role of the substrate in understanding the arrangement of 4T admolecules.
