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Comparative Study On The Adsorption Processes Of Alkanethiol And Alkanedithiol On Gold

Author

Listed:
  • 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)

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.

Suggested Citation

  • Hui He & Yan Guo & Shoufu Wang & Yaqing Jiang, 2010. "Comparative Study On The Adsorption Processes Of Alkanethiol And Alkanedithiol On Gold," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 17(04), pages 397-403.
    • Handle: RePEc:wsi:srlxxx:v:17:y:2010:i:04:n:s0218625x10014211
    DOI: 10.1142/S0218625X10014211
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