Fabrication of quantum-sized Cd S-coated Ti O2 nanotube array with efficient photoelectrochemical performance using modified successive ionic layer absorption and reaction(SILAR) method  

作　　者：Na Lu Yan Su Jingyuan Li Hongtao Yu Xie Quan 

机构地区：[1]Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology [2]Institute of Electrostatics and Special Power, Dalian University of Technology [3]Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology

出　　处：《Science Bulletin》2015年第14期1281-1286,共6页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(21377020);the Fundamental Research Funds for the Central Universities(DUT15QY17)

摘　　要：Quantum-sized CdS-coated TiO2 nanotube array （Q-CdS-TiO2 NTA） was fabricated by the modified successive ionic layer absorption and reaction method. Scanning electron microscope and transmission electron microscope images showed the regular structure of TiO2 NTA, where quantum-sized CdS （diameter 〈10nm） deposited on both the inside and outside of TiO2 nanotube wall. Fabrication conditions including immersing cycles, calcination temperature and drying process were well optimized, and the Q-CdS-TiO2 NTA and its photoelectrochemical （PEC） properties were characterized by X-ray fluorescence spectrometer, UV-Vis diffuse reflectance spectra and photovoltage. Distinct increases in visible light absorption and photocurrent were observed as the immersing cycle was increased from 5 to 20 times. The additional drying process accelerated the CdS crystal growth rate, and thus, the fabrication time could be shortened accordingly. Calcination temperature influenced the PEC property of Q-CdS-TiO2 NTA deeply, and the optimized calcination temperature was found as 500 ℃. As the Q-CdS-TiO2 NTA was fabricated under such condition, the visible photocurrent density increased to 2.8 mA/cm and the photovoltage between 350 and 480 nm was enhanced by 2.33 times than that without calcination. This study is expected to optimize Q-CdS-TiO2 NTA fabrication conditions for the purpose of improving its PEC performance.Quantum-sized Cd S-coated Ti O2 nanotube array(Q-Cd S-Ti O2NTA) was fabricated by the modified successive ionic layer absorption and reaction method.Scanning electron microscope and transmission electron microscope images showed the regular structure of Ti O2 NTA, where quantum-sized Cd S(diameter \10 nm)deposited on both the inside and outside of Ti O2 nanotube wall. Fabrication conditions including immersing cycles,calcination temperature and drying process were well optimized, and the Q-Cd S-Ti O2 NTA and its photoelectrochemical(PEC) properties were characterized by X-ray fluorescence spectrometer, UV–Vis diffuse reflectance spectra and photovoltage. Distinct increases in visible light absorption and photocurrent were observed as the immersing cycle was increased from 5 to 20 times. The additional drying process accelerated the Cd S crystal growth rate, and thus, the fabrication time could be shortened accordingly. Calcination temperature influenced the PEC property of Q-Cd S-Ti O2 NTA deeply, and the optimized calcination temperature was found as 500 °C. As the Q-Cd S-Ti O2 NTA was fabricated under such condition, thevisible photocurrent density increased to 2.8 m A/cm and the photovoltage between 350 and 480 nm was enhanced by 2.33 times than that without calcination. This study is expected to optimize Q-Cd S-Ti O2 NTA fabrication conditions for the purpose of improving its PEC performance.

关 键 词：Quantum-sized CdS TiO2 nanotubearray Photoelectrochemical property 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O614.411[理学—无机化学]