COMPARATIVE STUDY ON THE ADSORPTION PROCESSES OF ALKANETHIOL AND ALKANEDITHIOL ON GOLD

Hui He (), Yan Guo, Shoufu Wang and Yaqing Jiang
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Hui He: College of Mechanics and Materials, Hohai University, Nanjing 210098, China
Yan Guo: School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
Shoufu Wang: College of Mechanics and Materials, Hohai University, Nanjing 210098, China
Yaqing Jiang: College of Mechanics and Materials, Hohai University, Nanjing 210098, China

Surface Review and Letters (SRL), 2010, vol. 17, issue 04, 397-403

Abstract: The kinetics of formation of self-assembled monolayers on gold generated by the adsorption of 1-octanethiol and 1,8-octanedithiol were explored by electrochemistry measurement. The time dependence of capacitance and surface coverage supported that the adsorption of thiols typically processed with a two-step adsorption consisted of a fast initial adsorption and a slowly following reorganization. From the function of surface coverage versus time, one could get rate constants of adsorption of thiols, and the adsorption process was demonstrated to follow a diffusion-controlled Langmuir model. A comparison of the adsorption rates for different concentration between 1-octanethiol and 1,8-octanedithiol revealed that their adsorption processes were almost identical and independent on the concentration, inferring that only one sulfur atom contributed to the self-assembly of dithiol molecule.

Keywords: Self-assembly; adsorption; thiol; dithiol; cyclic voltammetry (search for similar items in EconPapers)
Date: 2010
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DOI: 10.1142/S0218625X10014211

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