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论文类型：期刊论文

发表时间：2012-12-01

发表刊物：CERAMICS INTERNATIONAL

收录刊物：Scopus、SCIE

卷号：38

期号：8

页面范围：6341-6347

ISSN号：0272-8842

关键字：TiO2 nano-tubes; Hierarchical nanostructure; Formaldehyde; Gas sensors

摘要：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.