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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
2008-04-10
Source PublicationCHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
ISSN0251-0790
Volume29Issue:4Pages:700-704
AbstractIn 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 kinetic 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, beta, can be measured to be equal to 1.2 per methylene group.
KeywordSelf-assembled Monolayer Et kinEtics Across The Sams Scanning Electrochemical Microscopy Nnn ' n '-tetramethyl-p-phenylenediamine
Indexed BySCI
Language英语
WOS IDWOS:000255101400009
PublisherHIGHER EDUCATION PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/63914
Collection中国科学院化学研究所
Corresponding AuthorShao Yuan-Hua
AffiliationPeking Univ, Coll Chem & Mol Engn, Inst Analyt Chem, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Chen Zhong,Shen Li,Xie Shu-Bao,et al. Studies on kinetics of different types of probing species through self-assembled monolayers on a gold electrode by SECM[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2008,29(4):700-704.
APA Chen Zhong.,Shen Li.,Xie Shu-Bao.,He Sha-Li.,Jing Ping.,...&Shao Yuan-Hua.(2008).Studies on kinetics of different types of probing species through self-assembled monolayers on a gold electrode by SECM.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,29(4),700-704.
MLA Chen Zhong,et al."Studies on kinetics of different types of probing species through self-assembled monolayers on a gold electrode by SECM".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 29.4(2008):700-704.
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