Exchange kinetics of alkanethiol self-assembled monolayers probed by attenuated total reflection with enhancement of surface plasmon resonance

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作者：
Kajikawa, Kotaro [1 ]
Hara, Masahiko [1 ]
Sasabe, Hiroyuki [1 ]
Knoll, Wolfgang [1 ]
机构：
[1] Inst of Physical and Chemical, Research (RIKEN), Saitama, Japan
来源：
Japanese Journal of Applied Physics, Part 2: Letters | 1997年 / 36卷 / 8 B期
关键词：
Experimental; (EXP);
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摘要：
Exchange kinetics for octanethiol (C8H17SH) self-assembled monolayers (SAMs) by octadecanethiol (C18H37SH) in solution are studied by in situ measurements of reflectivity in the attenuated total reflection (ATR) geometry with surface plasmon resonance (SPR) enhancement. While rapid exchange kinetics are found for the octanethiol SAM prepared by 1-day exposure to the ethanol solution, the octanethiol SAM prepared by 30-minute exposure exhibits only slow exchange kinetics. This fact may originate from different adsorption states, due to the gradual dimerization of the octanethiol monomers during their exposure to the solution, with dimers being less strongly adsorbed than the monomers.
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