Hyperthermal atomic oxygen beam-induced etching of HOPG (0001) studied by X-ray photoelectron spectroscopy and scanning tunneling microscopy

Hiroshi Kinoshita, Masataka Umeno, Masahito Tagawa, Nobuo Ohmae

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

The basal planes of highly oriented pyrolytic graphite (HOPG) surfaces were exposed to atomic oxygen (AO) beam with a translational energy of approximately 5 eV at room temperature. The characterization of the surfaces was carried out using X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). The XPS spectra of the hyperthermal AO-exposed surfaces indicated that the oxygen coverage reached the saturated value of 0.94 with the AO fluence of approximately 4 × 1017 atoms cm-2. The initial reaction site of the AO on the defect-free HOPG (0001) surface was observed as a protrusion in the STM images. In contrast, a hillock-like structure was formed at the AO-exposed HOPG (0001) surfaces at high AO fluences. The density of protrusions, observed in the initial AO/HOPG reaction, increased in proportion to the AO fluence. The reaction yield of hyperthermal AO with the defect-free HOPG (0001) surface was estimated to be 1.0 × 10-3. This value is two orders lower than that determined in the flight experiment aboard the space shuttle where the same chemical reaction was expected. The discrepancy was explained by the high reaction yield of the oxygen-covered prism planes of HOPG presented at the hillock surfaces.

Original languageEnglish
Pages (from-to)49-59
Number of pages11
JournalSurface Science
Volume440
Issue number1-2
DOIs
Publication statusPublished - Oct 1 1999
Externally publishedYes

Fingerprint

Graphite
pyrolytic graphite
Scanning tunneling microscopy
scanning tunneling microscopy
Etching
X ray photoelectron spectroscopy
etching
photoelectron spectroscopy
Oxygen
oxygen
x rays
fluence
Defects
space shuttles
Space shuttles
defects
Prisms
prisms
Chemical reactions
chemical reactions

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Hyperthermal atomic oxygen beam-induced etching of HOPG (0001) studied by X-ray photoelectron spectroscopy and scanning tunneling microscopy. / Kinoshita, Hiroshi; Umeno, Masataka; Tagawa, Masahito; Ohmae, Nobuo.

In: Surface Science, Vol. 440, No. 1-2, 01.10.1999, p. 49-59.

Research output: Contribution to journalArticle

Kinoshita, Hiroshi ; Umeno, Masataka ; Tagawa, Masahito ; Ohmae, Nobuo. / Hyperthermal atomic oxygen beam-induced etching of HOPG (0001) studied by X-ray photoelectron spectroscopy and scanning tunneling microscopy. In: Surface Science. 1999 ; Vol. 440, No. 1-2. pp. 49-59.
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