金红石
锐钛矿
材料科学
载流子
纳秒
光催化
X射线光电子能谱
耗尽区
化学物理
放松(心理学)
表面状态
载流子寿命
曲面(拓扑)
带材弯曲
电子
纳米技术
Crystal(编程语言)
光电子学
化学
化学工程
图层(电子)
光学
硅
物理
有机化学
生物化学
量子力学
程序设计语言
激光器
社会心理学
催化作用
计算机科学
数学
心理学
工程类
几何学
作者
K. Ozawa,Masato Emori,Susumu Yamamoto,Ryu Yukawa,Shingo Yamamoto,Rei Hobara,K. Fujikawa,Hiroshi Sakama,Iwao Matsuda
摘要
Photocatalytic activity is determined by the transport property of photoexcited carriers from the interior to the surface of photocatalysts. Because the carrier dynamics is influenced by a space charge layer (SCL) in the subsurface region, an understanding of the effect of the potential barrier of the SCL on the carrier behavior is essential. Here we have investigated the relaxation time of the photoexcited carriers on single-crystal anatase and rutile TiO2 surfaces by time-resolved photoelectron spectroscopy and found that carrier recombination, taking a nanosecond time scale at room temperature, is strongly influenced by the barrier height of the SCL. Under the flat-band condition, which is realized in nanometer-sized photocatalysts, the carriers have a longer lifetime on the anatase surface than the rutile one, naturally explaining the higher photocatalytic activity for anatase than rutile.
科研通智能强力驱动
Strongly Powered by AbleSci AI