Title of article :
Adsorption characteristics of self-assembled thiol and dithiol layer on gold
Author/Authors :
Tlili، نويسنده , , A. and Abdelghani، نويسنده , , A. and Aguir، نويسنده , , K. and Gillet، نويسنده , , M. and Jaffrezic-Renault، نويسنده , , N.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Pages :
5
From page :
620
To page :
624
Abstract :
Monolayers of functional proteins are important in many fields related to pure and applied biochemistry and biophysics. The formation of extended uniform protein monolayers by single- or multiple-step self-chemisorption depends on the quality of the functionalized gold surface. The optical and the electrical properties of the 1-nonanethiol and 1,9-nonanedithiol deposited on gold with the self-assembled technique were investigated. We use cyclic voltammetry and impedance spectroscopy to characterize the insulating properties of the two layers. The analysis of the impedance spectra in terms of equivalent circuit of the gold/electrolyte and gold/SAM/electrolyte interface allows defining the thickness of the two thiols and the percentage of coverage area. Atomic force microscopy, contact angle measurement and Fourier transform infra-red spectroscopy have been used for homogeneity, hydrophobic properties and molecular structure of the formed thiols layer, respectively. The measured thickness with impedance spectroscopy fit well the results found with atomic force microscopy.
Keywords :
Self-assembled monolayers , AFM , Contact angle , Impedance spectroscopy
Journal title :
Materials Science and Engineering C
Serial Year :
2007
Journal title :
Materials Science and Engineering C
Record number :
2096550
Link To Document :
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