Elucidating the charge state of an Au nanocluster on the oxidized/reduced rutile TiO2 (110) surface using non-contact atomic force microscopy and Kelvin probe force microscopy,Nanoscale Advances

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Elucidating the charge state of an Au nanocluster on the oxidized/reduced rutile TiO2 (110) surface using non-contact atomic force microscopy and Kelvin probe force microscopy
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-03-25 , DOI: 10.1039/c9na00776h
Yuuki Adachi ₁ , Huan Fei Wen ₂ , Quanzhen Zhang ₁ , Masato Miyazaki ₁ , Yasuhiro Sugawara ₁ , Yan Jun Li ₁

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The charge state of Au nanoclusters on oxidized/reduced rutile TiO₂ (110) surfaces were investigated by a combination of non-contact atomic force microscopy and Kelvin probe force microscopy at 78 K under ultra-high vacuum. We found that the Au nanoclusters supported on oxidized/reduced surfaces had a relatively positive/negative charge state, respectively, compared with the substrate. In addition, the distance dependence of LCPD verified 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 condition of the support used.

中文翻译：

使用非接触原子力显微镜和开尔文探针力显微镜阐明氧化/还原金红石 TiO2 (110) 表面上 Au 纳米团簇的电荷状态

通过非接触式原子力显微镜和开尔文探针力显微镜在超高真空下 78 K 的组合研究了氧化/还原金红石 TiO _{2 (110) 表面上金纳米团簇的电荷状态。}我们发现，与衬底相比，负载在氧化/还原表面上的 Au 纳米团簇分别具有相对的正/负电荷状态。此外，LCPD 的距离依赖性验证了在 KPFM 图像中观察到的对比度。电荷转移观察的物理背景可以通过围绕金纳米团簇的多个氧空位/吸附原子的电荷附着/脱离模型来解释。这些结果表明，金纳米团簇的电子特性受到所用载体条件的显着影响。

更新日期：2020-03-25

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