Enhanced UV Response of Single Anodic TiO2 Nanotube: Effect of Water-Modified Microstructures

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	Enhanced UV Response of Single Anodic TiO2 Nanotube: Effect of Water-Modified Microstructures
	Wang, Q ; Li, JJ ; Gu, CZ
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2012
卷号	116 期号:32 页码:16864
关键词	TEMPERATURE NANOWIRES CELLS
ISSN号	1932-7447
通讯作者	Wang, Q: Harbin Inst Technol Wei Hai, Dept Opt & Elect Sci, Coll Sci, Weihai 264209, Peoples R China.
中文摘要	Water-modified ultraviolet (UV) light response of single anodic TiO2 nanotube (NT) is reported in this article. After keeping in deionized water at room temperature, the original smooth surface of amorphous TiO2 NTs is roughened and even changes into sponge-like structure by stacking of further oxidized and crystallized nanodots (NDs) through water-driven surface dissolution process. Two-dimensional variable range hopping (2D-VRH) model is recognized to interpret low-temperature electrical transport properties for the original NT, and the water-modified NT shows deviation from this mechanism owing to the additional electronic tunneling through the surface-crystallized NDs assemblies. The resistance in dark is increased about one order after water-modification due to surface carrier depletion by nanocontacts between crystalline NDs and the original amorphous core. The UV sensitivity S (I-UV/I-dark) of as-prepared single NT is similar to 1.6, and response and recovery times are about 0.39 and 0.45 s, respectively. S is increased to similar to 21.7 after surface water-modification, whereas response and recovery times are increased to 7.1 and 7.5 s, respectively. Surface water-modification will reduce the density of recombination centers and increase the trap state density of carriers in TiO2 NT due to surface charge-separation effect, both leading to the larger UV sensitivity and response time. Single anodic TiO2 NT shows no persistent photocurrent, and it can be applied as high-speed, high-sensitivity UV optoelectronic nanodevices.
收录类别	SCI
资助信息	National Natural Science Foundation of China [60907023, 50825206, 91023041]; Knowledge Innovation Project of CAS [KJCX2-EW-W02]; Shandong Excellent Young Scientist Research Award Fund Project [BS2011CL002]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/37397]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Wang, Q,Li, JJ,Gu, CZ. Enhanced UV Response of Single Anodic TiO2 Nanotube: Effect of Water-Modified Microstructures[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2012,116(32):16864.
APA	Wang, Q,Li, JJ,&Gu, CZ.(2012).Enhanced UV Response of Single Anodic TiO2 Nanotube: Effect of Water-Modified Microstructures.JOURNAL OF PHYSICAL CHEMISTRY C,116(32),16864.
MLA	Wang, Q,et al."Enhanced UV Response of Single Anodic TiO2 Nanotube: Effect of Water-Modified Microstructures".JOURNAL OF PHYSICAL CHEMISTRY C 116.32(2012):16864.