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Alkyl Chain Dependent Alkanethiol Self-Assembled Adsorption Dynamics

Author

Listed:
  • YAN GUO

    (School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China)

  • MINGDONG CHEN

    (School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China)

  • HUI HE

    (College of Mechanics and Materials, Hohai University, Nanjing 210098, P. R. China;
    Huaian Research Institute of Hohai University, Huaian 223001, P. R. China)

Abstract

The adsorption dynamics for the formation of self-assembled monolayer of alkanethiols has been investigated by electrochemical method, water contact angle and scanning tunneling microscopy. Thiols with three alkyl chains, including short chain hexanethiol, middle chain dodecanethiol, and long chain octadecanethiol are examined. The experimental results indicate that the adsorption of thiols ontoAusubstrate consists of two process, a rapid adsorption and a slow reorganization. The rapid adsorption process is demonstrated to follow the diffusion-controlled Langmuir model. The apparent adsorption rate constant is obtained from the slopes, which is related to the concentration. According to our results, the difference of activation energy per methylene unit is 89 J/mol.

Suggested Citation

  • Yan Guo & Mingdong Chen & Hui He, 2015. "Alkyl Chain Dependent Alkanethiol Self-Assembled Adsorption Dynamics," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 22(01), pages 1-8.
    • Handle: RePEc:wsi:srlxxx:v:22:y:2015:i:01:n:s0218625x15500043
    DOI: 10.1142/S0218625X15500043
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