AVS 46th International Symposium
    Surface Science Division Tuesday Sessions
       Session SS-TuP

Paper SS-TuP9
Insertion Process of Conjugated Molecules into n-Alkanethiol Self-Assembled Monolayers on Au(111)

Tuesday, October 26, 1999, 5:30 pm, Room 4C

Session: Poster Session
Presenter: T. Ishida, JRCAT-NAIR and PRESTO-JST, Japan
Authors: T. Ishida, JRCAT-NAIR and PRESTO-JST, Japan
W. Mizutani, JRCAT-NAIR, Japan
U. Akiba, Tokyo Institute of Technology, Japan
N. Choi, JRCAT-ATP, Japan
M. Fujihira, Tokyo Institute of Technology, Japan
H. Tokumoto, JRCAT-NAIR, Japan
Correspondent: Click to Email
Since conjugated molecules are a good candidate for the components of nanoscale devices, functions of organic molecules have been investigated in search of their potential applications. To analyze the property of such conjugated molecules, insertion of such a molecule into pre-assembled n-alkanethiol SAMs on Au(111) is attracted recently. We have investigated using STM insertion process of conjugated molecules, benzylmercaptane (BM), 4-biphenylmethanethiol (BP), and [1,1':4',1''-Terphenyl]-4-methanethiol (TP) into alkanethiol SAMs. These conjugated molecules were inserted into boundaries between structural domains of n-alkanethiol SAMs at the initial stage of insertion reaction. The insertion process rate increased with the number of phenyl rings of the conjugated molecule, i.e., the most of alkanethiols were replaced by BP and TP for 3-4 h and 2 h, respectively. On the other hand, BMs were inserted in the domain boundaries even after one day insertion reaction. These results suggested that the interaction energy difference between the conjugated molecules and alkanethiols strongly affected the insertion reaction.