ALKYL CHAIN DEPENDENT ALKANETHIOL SELF-ASSEMBLED ADSORPTION DYNAMICS

Yan Guo, Mingdong Chen and Hui He
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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;

Surface Review and Letters (SRL), 2015, vol. 22, issue 01, 1-8

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.

Keywords: Thiol; self-assembly; adsorption dynamics (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1142/S0218625X15500043

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