Acta Phys. -Chim. Sin. ›› 1998, Vol. 14 ›› Issue (09): 846-851.doi: 10.3866/PKU.WHXB19980915

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Study of the Formation Process of an Azobenzene Self-assembled Monolayer on Gold Surface

Shao Hui-Bo, Yu Hua-Zhong, Cheng Guang-Jun, Zhang Hao-Li, Liu Zhong-Fan   

  1. Center for Intelligent Materials Research(CIMR),College of Chemistry and Molecular Engineering,Peking University,Beijing 100871
  • Received:1997-07-02 Revised:1997-08-12 Published:1998-09-15
  • Contact: Liu Zhong-Fan

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Abstract:

The formation kinetics of the self-assembled monolayer (SAM) of an azobenzenealkanethiol, denoted as AzoC2SH on surface was studied using electrochemical techniques, and the monolayers prepared at different assembly times and concentration were also investigated. A two-step adsorption kinetics has been confirmed: the fast adsorption process and the following long-term reorganization. The equilibrium constant(K)for the adsorption and the interaction factor between adsorbate-adsorbate molecules (δ) were evaluated based on the Frumkin isotherm and determined to be (3. 17±0. 13)× 106 mol•L(-1) and -0.34±0.04, respectively. The Gibbs free energy (G)of SAM was determined to be -(37. 07±0. 13)kJ•mol(-1).

Key words: Azobenzene, Self-assembled monolayer, Frumkin isotherm