Studies on Kinetics of Different Types of Probing Species Through Self-assembled Monolayers on a Gold Electrode by SECM

Chem. J. Chinese Universities

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Studies on Kinetics of Different Types of Probing Species Through Self-assembled Monolayers on a Gold Electrode by SECM

CHEN Zhong, SHEN Li, XIE Shu-Bao, HE Sha-Li, JING Ping, XU Xiao-Dong, SHAO Yuan-Hua*

Beijing National Laboratory for Molecular Sciences, Institute of Analytical Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Received:2007-09-29 Revised:1900-01-01 Online:2008-04-10 Published:2008-04-10
Contact: SHAO Yuan-Hua

Abstract

Abstract: In this paper, the kinetic behavior of mediators with different polarities at n-alkanethiol modified gold electrode are investigated by scanning electrochemical microscopy(SECM). Ferrocyanide[K₄Fe(CN)₆] and N,N,N',N'-tetramethyl-p-phenylenediamine(TMPD) are employed as the mediators, and the self-assembled monolayers(SAMs) act as a better blocking barrier for the transport of ferrocyanide than that of TMPD. This difference is mainly because of the better permeation of TMPD into the hydrophobic monolayers. A simple model is applied to extract the kinetic rate constants of the permeation step. On the basis of the kinctic rate constants obtained, we can deduce that the equilibriums exist before and after the electronic transfer(ET) when using TMPD, and the apparent kinetic constant is larger than ferrocyanide in this step. The tunneling decay constant of the TMPD in the SAMs, β, can be measured to be equal to 1.2 per methylene group.

Key words: Self-assembled monolayer, ET kinetics across the SAMs, Scanning electrochemical microscopy, N,N,N’,N’-tetramethyl-p-phenylenediamine

CLC Number:

O646

TrendMD:

CHEN Zhong, SHEN Li, XIE Shu-Bao, HE Sha-Li, JING Ping, XU Xiao-Dong, SHAO Yuan-Hua*. Studies on Kinetics of Different Types of Probing Species Through Self-assembled Monolayers on a Gold Electrode by SECM[J]. Chem. J. Chinese Universities, doi: .

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Studies on Kinetics of Different Types of Probing Species Through Self-assembled Monolayers on a Gold Electrode by SECM

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