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

doi:10.1016/0039-6028(91)90635-6

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

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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, E_d = 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 E_d = 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 language	English (US)
Pages (from-to)	29-44
Number of pages	16
Journal	Surface Science
Volume	254
Issue number	1-3
DOIs	https://doi.org/10.1016/0039-6028(91)90635-6
State	Published - Aug 2 1991

All Science Journal Classification (ASJC) codes

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

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10.1016/0039-6028(91)90635-6

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title = "A vibrational study of borazine adsorbed on Pt(111) and Au(111) surfaces",

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.",

author = "Simonson, {R. J.} and Paffett, {M. T.} and Jones, {M. E.} and Koel, {Bruce E.}",

note = "Funding Information: We thank Professor M. Trenary of the University of Illinois at Chicago for helpful discussions and for sharing surface IR absorption data prior to publication. Support for this work from the Los Alamos National Laboratory internal research and development funds is gratefully acknowledged by M.T.P. and R.J.S. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.",

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AU - Jones, M. E.

AU - Koel, Bruce E.

N1 - Funding Information: We thank Professor M. Trenary of the University of Illinois at Chicago for helpful discussions and for sharing surface IR absorption data prior to publication. Support for this work from the Los Alamos National Laboratory internal research and development funds is gratefully acknowledged by M.T.P. and R.J.S. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.

PY - 1991/8/2

Y1 - 1991/8/2

N2 - 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.

AB - 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.

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

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