Indexed by:
期刊论文
First Author:
Wu, Guoqiang
Correspondence Author:
Lin, SW (reprint author), Hainan Univ, Key Lab, Minist Educ Applicat Technol Chem Mat Hainan Supe, Haikou 570228, Peoples R China.
Co-author:
Wang, Jing,Zhang, Jianwei,Wang, Xiaoying,Liao, Jianjun,Xia, Hui,Akbar, Sheikh A.,Li, Jianbao,Lin, Shiwei,Li, Xiaogan
Date of Publication:
2012-12-01
Journal:
CERAMICS INTERNATIONAL
Included Journals:
Scopus、SCIE
Document Type:
J
Volume:
38
Issue:
8
Page Number:
6341-6347
ISSN No.:
0272-8842
Key Words:
TiO2 nano-tubes; Hierarchical nanostructure; Formaldehyde; Gas sensors
Abstract:
Hierarchical structured TiO2 nano-tubes were prepared following a two-step method: the highly ordered uniform TiO2 nanotube arrays were first grown by the conventional electrochemical anodization of the Ti metal sheet followed by mechanical milling of the as-fabricated TiO2 nanotube arrays. The obtained nanotubes with a length around 400 nm and opening diameter similar to 100 nm were formed mixed with the spherical TiO2 single crystals with a diameter around 10 nm indicating hierarchical nanostructure. The as-synthesized TiO2 hierarchical nanotubes based resistive-type chemical sensor exhibits good sensitivity to formaldehyde at room temperatures with or without UV-irradiation. The response of the sensor increased almost linearly as a function of the concentration of formaldehyde from 10-50 ppm under UV irradiation. The response of the sensor to different relative humidity and other possible interferents such as ammonia, methanol and alcohol was investigated. The larger response of the sensor to formaldehyde relative to these interferents is suggested to be due to the deeper diffusion of formaldehyde into the TiO2 nanotubes. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Translation or Not:
no
