Elucidating Charge State of an Au Nanocluster on Oxidized/Reduced Rutile TiO2 (110) Surfaces using non-contact atomic force microscopy and Kelvin probe force microscopy
The charge state of Au nanoclusters on oxidized/reduced rutile TiO2(110) surfaces are investigated by combination of non-contact atomic force microscopy and Kelvin probe force microscopy at 78K under ultra-high vacuum. We found that the Au nanocluster supported on oxidized/reduced surfaces has relatively positive/negative charge state compared with the substrate respectively. In addition, the distance dependence of LCPD verifies the contrast observed in the KPFM images. The physical background of charge transfer observation can be explained by the model of charge attachment/detachment from multiple oxygen vacancies/adatoms surrounding Au nanoclusters. These results suggest that the electronic properties of the Au nanoclusters are dramatically influenced by the support condition.
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