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Surface Photocatalysis-TPD Spectrometer for Photochemical Kinetics
Ze-feng Ren1, Qing Guo1, Chen-biao Xu1,2, Wen-shao Yang1, Chun-lei Xiao1, Dong-xu Dai1, Xue-ming Yang*1
1.State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China;2.School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
Abstract:
A surface photocatalysis-TPD apparatus devoted to studying kinetics and mechanism of pho-tocatalytic processes with various signal crystal surfaces has been constructed. Extremely high vacuum ( 0.2 nPa) in the ionization region is obtained by using multiple ultrahigh vacuum pumps. Compared with similar instruments built previously by others, the H2, CH4 background in the ionization region can be reduced by about two orders of magnitude, and other residual gases in the ionization region can be reduced by about an order of magnitude. Therefore, the signal-to-noise ratio for the temperature programmed desorption (TPD) and time of flight (TOF) spectra is substantially enhanced, making experimental studies of pho-tocatalytic processes on surfaces much easier. In this work, we describe the new apparatus in detail and present some preliminary studies on the photo-induced oxygen vacancy defects on TiO2(110) at 266 nm by using the TPD and TOF methods. Preliminary results suggest that the apparatus is a powerful tool for studying kinetics and mechanism of photochemical processes.
Key words:  Temperature programmed desorption, Time of flight spectrum, Surface pho-tochemical kinetics
FundProject:
基于TPD的表面光化学动力学研究装置
任泽峰1, 郭庆1, 徐晨彪1,2, 杨文绍1, 肖春雷1, 戴东旭1, 杨学明*1
1.中国科学院大连化学物理研究所,大连116023;2.大连理工大学物理与光电工程学院,大连116024
摘要:
搭建了一套基于程序升温脱附谱(TPD)探测方法用于研究不同表面光化学过程动力学和机理的质谱系统. 该装置通过不同真空泵组合,共同抽气,使得探测区域的真空达到0.2 nPa. 与以前相似的仪器相比,探测区域H2和CH4的背底下降了两个数量级,其他残余气体的背底下降了大约一个数量级. 在这种真空条件下能有效的提高TPD和时间飞渡谱的信噪比,对于研究光催化过程更加有利. 这套装置研究了266 nm的光在TiO2(110)表面产生氧空位的光化学行为,其结果表明这套基于TPD的表面光化学动力学研究装置对研究表面光化学过程十分有效.
关键词:  程序升温脱附谱,时间飞渡谱,表面光化学动力学
DOI:10.1088/1674-0068/25/05/507-512
分类号: