Effect of Alkanethiol Self-assembled Monolayers on the Electrochemical Polymerization of Pyrrole on the Gold Electrodes

Abstract

Abstract: Pyrrole was polymerized on alkanethiol self-assembled SAMs monolayers modified gold electrodes through electrochemical method. The effects of alkyl chain length and the end functional groups of the SAMs on the polymerization of pyrrole were studied by chronoamperometry, cyclic voltammograms and electrochemical impedance spectroscopy. In the case of SAMs with a high integrity, the polypyrrole grewon the top of SAMs. However, in the case of a large number of pinhole defects, the formation of polymer nuclei on pinhole sites scattered in the SAMs, and then the polymer grewon the entire surface of the SAMs. These results showed that the electrochemical polymerization was easier with shorter alkyl chains, and high hydrophobility of the SAMs could promote the polymer film growth.

Key words: Polypyrrole, Electrochemical polymerization, Alkanethiol, Self-assembled monolayer films, Alkyl chain length, End functional group

CLC Number:

O646

TrendMD:

GONG Shao-Yun, SHEN Yan-Fei, ZHOU Wei-Hong, LI Jing-Hong . Effect of Alkanethiol Self-assembled Monolayers on the Electrochemical Polymerization of Pyrrole on the Gold Electrodes[J]. Chem. J. Chinese Universities, 2004, 25(9): 1719.

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Effect of Alkanethiol Self-assembled Monolayers on the Electrochemical Polymerization of Pyrrole on the Gold Electrodes

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