期刊
SURFACE REVIEW AND LETTERS
卷 9, 期 2, 页码 717-722出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218625X02002750
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Ammonia adsorption on the nonpolar ZnO(10(1) over bar 0) 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 O 2p dangling 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 of NH3. Annealing the ammonia-covered surface induces the partially decomposed NHx (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.
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