Effects of electron irradiation on methylthiolate monolayer on Au(111): Electron-stimulated desorption

Hiroshi Kondoh, H. Nozoye

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Effects of electron irradiation on a methylthiolate (CH3S) self-assembled monolayer on Au(111) have been studied by using scanning tunneling microscope (STM), Auger electron spectroscopy (AES), low-energy electron diffraction, and thermal-desorption spectroscopy (TDS). AES results indicated that irradiation of the CH3S/Au(111) surface by an electron beam induces electron-stimulated desorption (ESD). in which mainly the methyl moiety desorbs via S-C bond cleavage, leaving a sulfur atom on the surface. From a quantitative analysis of TD spectra, the cross section of the ESD is estimated to be 2.8 × 10-17 cm2 for 100-eV electrons. Two-dimensional arrangements of the methylthiolate and the sulfur species under the ESD process have been investigated with STM. The STM observations indicated that the sulfur adatoms form 2D islands that grow in size with the progress of the ESD process, while unaffected methylthiolates are distributed between the sulfur islands. After the completion of the ESD, the Au(111) surface is covered with small patches (≲100 Å) of sulfur domains.

Original languageEnglish
Pages (from-to)2367-2372
Number of pages6
JournalJournal of Physical Chemistry B
Volume102
Issue number13
Publication statusPublished - 1998 Mar 26
Externally publishedYes

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Electron irradiation
electron irradiation
Monolayers
Desorption
Sulfur
desorption
sulfur
Electrons
Microscopes
electrons
microscopes
Auger electron spectroscopy
Scanning
Auger spectroscopy
scanning
electron spectroscopy
Thermal desorption spectroscopy
Adatoms
Low energy electron diffraction
Self assembled monolayers

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Effects of electron irradiation on methylthiolate monolayer on Au(111) : Electron-stimulated desorption. / Kondoh, Hiroshi; Nozoye, H.

In: Journal of Physical Chemistry B, Vol. 102, No. 13, 26.03.1998, p. 2367-2372.

Research output: Contribution to journalArticle

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