Miyazaki Masato, Sugawara Yasuhiro, Li Yan Jun
Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Langmuir. 2021 Sep 7;37(35):10588-10593. doi: 10.1021/acs.langmuir.1c01845. Epub 2021 Aug 26.
Titanium dioxide (TiO) is of considerable interest as a photocatalyst and a catalyst support. Surface hydroxyl groups (OH) are the most common adsorbates on the TiO surface and are believed to play crucial roles in their applications. Although the characteristics of bridging hydroxyl (OH) have been well understood, the adsorption structure and charged states of terminal hydroxyl (OH) have not yet been experimentally elucidated at an atomic scale. In this study, we have investigated an isolated OH on the rutile TiO(110) surface by atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM). We found that OH is in a negatively charged state. The unique characteristic of OH is different from that of OH and involves the amphoterism and diversity of catalytic reactions of TiO.
二氧化钛（TiO₂）作为一种光催化剂和催化剂载体备受关注。表面羟基（OH）是TiO₂表面最常见的吸附物，被认为在其应用中起着关键作用。尽管桥连羟基（OH）的特性已得到充分理解，但末端羟基（OH）的吸附结构和带电状态尚未在原子尺度上通过实验阐明。在本研究中，我们通过原子力显微镜（AFM）和开尔文探针力显微镜（KPFM）研究了金红石型TiO₂（110）表面上孤立的OH。我们发现OH处于带负电状态。OH的独特特性与OH不同，涉及TiO₂催化反应的两性性和多样性。
