Active Site Structure and Local Electronic States of Photocatalysts by Space-resolved Spectroscopy using STM

用扫描隧道显微镜（STM）观察了在紫外光照射下tio2表面发生的纳米尺度的局部结构变化。这种现象在紫外光照射下是可逆的，并且被解释为由于光激发态的局部积累。这是首次在纳米尺度上观察到紫外光照射下半导体光催化剂表面不均匀的局部电荷分布，这可能有助于确定光催化活性位点并阐明其反应机理。

An apparent local surface structural change at nanoscale was observed by scanning tunneling microscopy (STM) on a TiOs surface upon illumination of ultra-violet (UV) light. This phenomenon was reversible with UV light irradiation, and was interpreted to be due to the local accumulation of photoexcited states. This is the first real-space observation of inhomogeneous local charge distribution under UV light irradiation at nanoscale on a semiconductive photocatalyst surface, which may help identifying the photocatalytic active sites and elucidating the reaction mechanisms over them.