A UV light enhanced TiO2/graphene device for oxygen sensing at room temperature

Jia Zhang; Chao Zhao; Ping An Hu; Yong Qing Fu; Zhenlong Wang; Wenwu Cao; Bin Yang; Frank Placido

doi:10.1039/C3RA43480J

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A UV light enhanced TiO₂/graphene device for oxygen sensing at room temperature†

Jia Zhang,^ab Chao Zhao,^b Ping An Hu,*^a Yong Qing Fu,*^b Zhenlong Wang,*^a Wenwu Cao,^c Bin Yang^c and Frank Placido^b

Author affiliations

* Corresponding authors

^a Key Lab of Microsystem and Microstructure, Harbin Institute of Technology, Ministry of Education, No. 2 YiKuang Street, Harbin, China
E-mail: hupa@hit.edu.cn; wangzl@hit.edu.cn

^b Thin Film Centre, Scottish Universities Physics Alliance (SUPA), University of the West of Scotland, Paisley, UK
E-mail: richard.fu@uws.ac.uk

^c Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150080, China

Abstract

A room temperature oxygen sensor based on TiO₂/graphene device was developed with an enhanced sensing performance by UV light. A logarithmic relationship between the sensing response and O₂ concentration (from 134 ppm to 100%) was obtained. The sensor also shows an improved response and recovery with the durations of 193 s and 135 s at RT and atmosphere pressure, respectively. Herein, UV light was employed to excite electron–hole pairs in the TiO₂ film and the photogenerated electrons were scavenged by graphene and percolated to the collecting electrode, while the holes recombined with the electrons within TiO₂ film. This process will deplete the electron further thereby changing the conductivity of the device rapidly resulting in a much better sensing signal.

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Article information

DOI: https://doi.org/10.1039/C3RA43480J
Article type: Paper
Submitted: 10 Jul 2013
Accepted: 20 Sep 2013
First published: 01 Oct 2013

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RSC Adv., 2013,3, 22185-22190

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A UV light enhanced TiO₂/graphene device for oxygen sensing at room temperature

J. Zhang, C. Zhao, P. A. Hu, Y. Q. Fu, Z. Wang, W. Cao, B. Yang and F. Placido, RSC Adv., 2013, 3, 22185 DOI: 10.1039/C3RA43480J

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