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PHOTOELECTRON SPECTROSCOPY STUDY OF AMMONIA ADSORPTION ON${\rm ZnO}(10\bar 10)$

Author

Listed:
  • KENICHI OZAWA

    (Department of Chemistry and Materials Science, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-0033, Japan)

  • KAZUYUKI EDAMOTO

    (Department of Chemistry and Materials Science, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-0033, Japan)

Abstract

Ammonia adsorption on the nonpolar${\rm ZnO}(10\bar 10)$surface has been studied using X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. Ammonia adsorbs on the surface molecularly at room temperature. Adsorption induces the shift of the O2pdangling bond state to the higher binding energy side. This implies the formation of the hydrogen bond between the surface O atoms and the H atoms ofNH3. Annealing the ammonia-covered surface induces the partially decomposedNHx(x=1,2)species. All adsorbates are removed at the surface temperature of 625–650 K. When the surface is precovered with K, no adsorbed ammonia is observed. Not only a site blocking effect but also a nonlocal effect for poisoning is proposed.

Suggested Citation

  • Kenichi Ozawa & Kazuyuki Edamoto, 2002. "PHOTOELECTRON SPECTROSCOPY STUDY OF AMMONIA ADSORPTION ON${\rm ZnO}(10\bar 10)$," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 9(02), pages 717-722.
    • Handle: RePEc:wsi:srlxxx:v:09:y:2002:i:02:n:s0218625x02002750
    DOI: 10.1142/S0218625X02002750
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