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J Alloys Compd. 2015;653:255-259. Epub 2015 Dec 25.

UV-assisted room-temperature chemiresistive NO2 sensor based on TiO2 thin film.

Author information

1
Materials Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA ; Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742, USA.
2
N5 Sensors Inc., Rockville, MD 20852, USA.
3
Materials Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
4
Materials Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA ; N5 Sensors Inc., Rockville, MD 20852, USA.
5
Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742, USA.
6
Materials Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA ; N5 Sensors Inc., Rockville, MD 20852, USA ; Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742, USA.

Abstract

TiO2 thin film based, chemiresistive sensors for NO2 gas which operate at room temperature under ultraviolet (UV) illumination have been demonstrated in this work. The rf-sputter deposited and post-annealed TiO2 thin films have been characterized by atomic force microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction to obtain surface morphology, chemical state, and crystal structure, respectively. UV-vis absorption spectroscopy and Tauc plots show the optical properties of the TiO2 films. Under UV illumination, the NO2 sensing performance of the TiO2 films shows a reversible change in resistance at room-temperature. The observed change in electrical resistivity can be explained by the modulation of surface-adsorbed oxygen. This work is the first demonstration of a facile TiO2 sensor for NO2 analyte that operates at room-temperature under UV illumination.

PMID:
26681838
PMCID:
PMC4677394

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