Modification of the ZnO(0001) Surface by Adsorption of Hydrogen Atoms

초록

The electronic and chemical properties of ZnO surfaces are greatly affected by the adsorption of H atoms. The interaction of H atoms with ZnO(0001) and ZnO(000-1) surfaces has been investigated by temperature programmed desorption (TPD) methods. When the ZnO(000-1) surface is exposed to atomic H at 200 K, one desorption peak of H-2 is observed at 455 K (alpha-peak). In the case of ZnO(0001), two desorption peaks of H-2 are observed at 255 K (gamma-peak) and 455 K (alpha-peak). As H exposure increases, the intensity of the gamma-peak increases as the a-peak is attenuated. The alpha-peak is assigned as the hydrogen adsorbed on O-sites and the y-peak is attributed to hydrogen adsorbed on Zn clusters on ZnO. Zn clusters are produced only on the ZnO(0001) surface as surface O-H bonds are formed.

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