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

H. Kondoh, H. Nozoye

研究成果: Article査読

36 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)2367-2372
ページ数6
ジャーナルJournal of Physical Chemistry B
102
13
出版ステータスPublished - 1998 3 26
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学

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