A vibrational study of borazine adsorbed on Pt(111) and Au(111) surfaces

R. J. Simonson, M. T. Paffett, M. E. Jones, Bruce E. Koel

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Borazine (B3N3H6) adsorption and reaction on Pt(111) and Au(111) substrates at 100-1000 K has been investigated using thermal desorption mass spectroscopy (TDMS), ultraviolet photoelectron spectroscopy (UPS), and high-resolution electron energy loss spectroscopy (HREELS). Submonolayer coverages of borazine decompose on Pt(111) and only H2 desorption is observed upon heating. Multilayer borazine desorption occurs near 150 K, with an activation energy, Ed = 7.3 kcal mol. The H2 desorption peaks at 300 K are followed by a very broad desorption tail extending to 900 K, which is attributed to dehydrogenation of borazine molecular fragments. In contrast, molecular adsorption of borazine on Au(111) at 110 K is thermally reversible. Molecular borazine desorption from Au(111) occurs at 206 K with Ed = 12 kcal mol. The HREELS data show an unusual vertical orientation of the adsorbed borazine ring on Pt(111) at low temperature (170 K), but indicate a binding geometry for which the plane of the ring is parallel to the Au(111) surface. Possible reasons for the striking orientational difference in adsorption geometry and reactivity on these two metals are discussed.

Original languageEnglish (US)
Pages (from-to)29-44
Number of pages16
JournalSurface Science
Volume254
Issue number1-3
DOIs
StatePublished - Aug 2 1991

Fingerprint

Desorption
desorption
Electron energy loss spectroscopy
Adsorption
adsorption
Ultraviolet photoelectron spectroscopy
energy dissipation
Thermal desorption
electron energy
Geometry
vertical orientation
Dehydrogenation
rings
high resolution
ultraviolet spectroscopy
dehydrogenation
geometry
Multilayers
Activation energy
spectroscopy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Simonson, R. J. ; Paffett, M. T. ; Jones, M. E. ; Koel, Bruce E. / A vibrational study of borazine adsorbed on Pt(111) and Au(111) surfaces. In: Surface Science. 1991 ; Vol. 254, No. 1-3. pp. 29-44.
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A vibrational study of borazine adsorbed on Pt(111) and Au(111) surfaces. / Simonson, R. J.; Paffett, M. T.; Jones, M. E.; Koel, Bruce E.

In: Surface Science, Vol. 254, No. 1-3, 02.08.1991, p. 29-44.

Research output: Contribution to journalArticle

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