8.3.3 UV Assisted Chemical Gas Sensing of Nanoporous TiO2 at Low Temperature
- Event
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany - Chapter
- 8.3 Metal Oxide-based Gas Sensors VIII
- Author(s)
- L. Liu, X. Li, X. Wang, J. Yu, Z. Tang, J. Wang - Hainan University, Key Lab. of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources (P. R. China), S. Li, J. Liao - Dalian University of Technology, School of Electronic Science and Technology (P. R. China)
- Pages
- 698 - 701
- DOI
- 10.5162/IMCS2012/8.3.3
- ISBN
- 978-3-9813484-2-2
- Price
- free
Abstract
Nanoporous TiO2 powders were prepared following a two-step method. The highly ordered uniform TiO2 nanotube arrays were first grown by the electrochemical anodization of a Ti metal sheet and subsequently, mechanically milled to obtain the porous TiO2. The obtained nanoporous TiO2 sample contains nanotube-like particles with a length around 400 nm and inner diameter ~100 nm and also some near-spherical TiO2 single crystals with a diameter around 10 nm. The sensing properties of assynthesized nanoporous TiO2 based resistive-type chemical sensor to formaldehyde were demonstrated. The sensor exhibits good sensitivity to formaldehyde at room temperature under UV-irradiation. The response of the sensor increased almost linearly as a function of the concentration of formaldehyde from 10-50 ppm.