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Title
Japanese: 
English:Effect of Steric Hindrance on Desorption Processes of Alkanethiols on Au(111) 
Author
Japanese: 林 智広, 若松 健仁, 伊藤 英輔, 原 正彦.  
English: Tomohiro Hayashi, Kenji Wakamatsu, Eisuke Ito, Masahiko Hara.  
Language English 
Journal/Book name
Japanese: 
English:Journal of Physical Chemistry C 
Volume, Number, Page vol. 113        p. 18795-18799
Published date Sept. 2009 
Publisher
Japanese: 
English:American Chemical Society 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1021/jp906494u
Abstract Thermal decomposition processes of self-assembled monolayers (SAMs) on Au (111) composed of various thiol molecules were explored by thermal desorption spectroscopy (TDS). Desorption as disulfides was always observed for the methanethiol SAMs at any coverage, whereas the desorbed species from the SAMs of n-octanethiol strongly depended on the molecular density. In the case of cyclohexanethiol (cyclohexyl mercaptan), only monomers (thiol) desorbed from the SAM. In the cases of the mixed SAMs comprised of cyclohexylthiol and other thiolates (methanethiol and octanethiol), the desorption of asymmetric disulfides in a small yield was observed. TDS and X-ray photoelectron spectroscopy measurements revealed that these thiols are chemically bound to gold surfaces and that there was no significant difference in the chemical characters of their bonds to the substrates. These results suggest that the structure of a thiol molecule plays a critical role in determining the manner of desorption, thus providing hints for improving the thermal stability of SAMs.

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