Structure-dependent change of desorption species from n-alkanethiol monolayers adsorbed on Au(111): Desorption of thiolate radicals from low-density structures

Hiroshi Kondoh, C. Kodama, H. Nozoye

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Abstract

The coverage dependence of desorption behavior of n-alkanethiol monolayers on Au(111) has been studied using thermal desorption spectroscopy (TDS) together with scanning tunneling microscopy (STM) to investigate the molecule - substrate interactions. STM observations indicated four different phases during the growth. We present for the first time evidence for a drastic coverage-dependent change of desorption species, which is parallel with a structure change from a low-density phase to a denser phase: while the thiolates in the latter phase bimolecularly desorb as disulfides, those in the former phase unimolecularly desorb as thiolate radicals.

Original languageEnglish
Pages (from-to)2310-2312
Number of pages3
JournalJournal of Physical Chemistry B
Volume102
Issue number13
Publication statusPublished - 1998 Mar 26
Externally publishedYes

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Scanning tunneling microscopy
Monolayers
Desorption
desorption
Thermal desorption spectroscopy
scanning tunneling microscopy
Disulfides
disulfides
Molecules
Substrates
spectroscopy
molecules
interactions

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

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T2 - Desorption of thiolate radicals from low-density structures

AU - Kondoh, Hiroshi

AU - Kodama, C.

AU - Nozoye, H.

PY - 1998/3/26

Y1 - 1998/3/26

N2 - The coverage dependence of desorption behavior of n-alkanethiol monolayers on Au(111) has been studied using thermal desorption spectroscopy (TDS) together with scanning tunneling microscopy (STM) to investigate the molecule - substrate interactions. STM observations indicated four different phases during the growth. We present for the first time evidence for a drastic coverage-dependent change of desorption species, which is parallel with a structure change from a low-density phase to a denser phase: while the thiolates in the latter phase bimolecularly desorb as disulfides, those in the former phase unimolecularly desorb as thiolate radicals.

AB - The coverage dependence of desorption behavior of n-alkanethiol monolayers on Au(111) has been studied using thermal desorption spectroscopy (TDS) together with scanning tunneling microscopy (STM) to investigate the molecule - substrate interactions. STM observations indicated four different phases during the growth. We present for the first time evidence for a drastic coverage-dependent change of desorption species, which is parallel with a structure change from a low-density phase to a denser phase: while the thiolates in the latter phase bimolecularly desorb as disulfides, those in the former phase unimolecularly desorb as thiolate radicals.

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