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

Kenichi Ozawa () and Kazuyuki Edamoto
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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

Surface Review and Letters (SRL), 2002, vol. 09, issue 02, 717-722

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.

Date: 2002
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DOI: 10.1142/S0218625X02002750

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