Interaction of HNCO with Au(111) surfaces

A. P. Farkas, A. Berkó, F. Solymosi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The surface chemistry of isocyanic acid, HNCO, and its dissociation product, NCO, was studied on clean, O-dosed and Ar ion bombarded Au(111) surfaces. The techniques used are high resolution energy loss spectroscopy (HREELS) and temperature-programmed desorption (TPD). The structure of Ar ion etched surface is explored by scanning tunneling microscopy (STM). HNCO adsorbs molecularly on Au(111) surface at 100 K yielding strong losses at 1390, 2270 and 3230 cm - 1. The weakly adsorbed HNCO desorbs in two peaks characterized by T p = 130 and 145 K. The dissociation of the chemisorbed HNCO occurs at 150 K to give NCO species characterized by a vibration at 2185 cm - 1. The dissociation process is facilitated by the presence of preadsorbed O and by defect sites on Au(111) produced by Ar ion bombardment. In the latter case the loss feature of NCO appeared at 2130 cm - 1. Isocyanate on Au(111) surface was found to be more stable than on the single crystal surfaces of Pt-group metals. Results are compared with those obtained on supported Au catalysts.

Original languageEnglish
Pages (from-to)1345-1349
Number of pages5
JournalSurface Science
Volume606
Issue number15-16
DOIs
Publication statusPublished - Aug 2012

Fingerprint

dissociation
interactions
Ions
Single crystal surfaces
Isocyanates
Scanning tunneling microscopy
Temperature programmed desorption
Ion bombardment
Surface chemistry
ions
Catalyst supports
isocyanates
Energy dissipation
crystal surfaces
Metals
Spectroscopy
bombardment
scanning tunneling microscopy
Defects
energy dissipation

Keywords

  • Au(111) surface
  • HNCO
  • HREEL spectroscopy
  • NCO surface species
  • NO + CO reaction

ASJC Scopus subject areas

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

Cite this

Interaction of HNCO with Au(111) surfaces. / Farkas, A. P.; Berkó, A.; Solymosi, F.

In: Surface Science, Vol. 606, No. 15-16, 08.2012, p. 1345-1349.

Research output: Contribution to journalArticle

Farkas, A. P. ; Berkó, A. ; Solymosi, F. / Interaction of HNCO with Au(111) surfaces. In: Surface Science. 2012 ; Vol. 606, No. 15-16. pp. 1345-1349.
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