Surface dissociation properties of short chain carboxyl mercaptan self-assembled monolayers by impedance titration

Impedance titration was used to determine the surface dissociation characteristics of short-chain carboxyl mercaptan self-assembled monolayers (SAMs). Based on the change of the cyclic voltammetric peak current and the charge-transfer resistance, which was related to pH value of the solution, the su...

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Bibliographic Details
Published in:Wuhan University journal of natural sciences 2007-05, Vol.12 (3), p.522-528
Main Authors: Liu, Chuanyin, Hu, Junfu, Lu, Guanghan
Format: Article
Language:English
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Summary:Impedance titration was used to determine the surface dissociation characteristics of short-chain carboxyl mercaptan self-assembled monolayers (SAMs). Based on the change of the cyclic voltammetric peak current and the charge-transfer resistance, which was related to pH value of the solution, the surface pKalpha of mercaptoacetic acid(MA), 3-mercaptopropionic acid(MPA) and omega-mercaptohexanic acid(MHA) self-assembled membranes, with ionic strength being 0.1 mol/L, were determined to be 5.20, 4.80, 7.40, respectively. In addition, factors such as time needed for assembling, structure of monolayers and ionic strength, which effected the surface pKalpha, were studied as well. Such surface pKalpha shifts were sufficiently explained by interactions between interfacial molecules and hydrophobicity.
ISSN:1007-1202
1993-4998
DOI:10.1007/s11859-006-0085-2