Room temperature NO2-sensing properties of hexagonal tungsten oxide nanorods

doi:10.1088/1674-1056/26/2/020701

Abstract Hexagonal WO₃ nanorods were synthesized through a facile hydrothermal method. The nanorods properties were investigated by scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive spectroscopy (EDS), and x-ray diffraction (XRD). The NO₂-sensing performances in terms of sensor response, response/recovery times and repeatability at room temperature were optimized by varying the heat treatment temperature of WO₃ nanorods. The optimized NO₂ sensor (400-℃-annealed WO₃ nanorods) showed an ultra-high sensor response of 3.2 and short response time of 1 s to 5-ppm NO₂. In addition, the 400-℃-annealed sample exhibited more stable repeatability. Furthermore, dynamic responses measurements of annealed samples showed that all the annealed WO₃ nanorods sensors presented p-type behaviors. We suppose the p-type behavior of the WO₃ nanorods sensor to be that an inversion layer is formed in the space charge layer when the sensor is exposed to NO₂ at room temperature.Therefore, the 400-℃-annealed WO₃ nanorods sensor is one of the most energy conservation candidates to detect NO₂ at room temperature.

Keywords: WO₃ nanorods thermal treatment NO₂ gas sensor room temperature

Received: 30 August 2016
Revised: 21 October 2016
Accepted manuscript online:

PACS:	07.07.Df	(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)
	78.67.Qa	(Nanorods)
	61.46.Df	(Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60771019, 61271070, and 61274074) and the Tianjin Key Research Program of Application Foundation and Advanced Technology, China (Grant No. 11JCZDJC15300).

Corresponding Authors: Ming Hu
E-mail: huming@tju.edu.cn

Cite this article:

Yaqiao Wu(武雅乔), Ming Hu(胡明), Yuming Tian(田玉明) Room temperature NO₂-sensing properties of hexagonal tungsten oxide nanorods 2017 Chin. Phys. B 26 020701

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Room temperature NO2-sensing properties of hexagonal tungsten oxide nanorods

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Room temperature NO₂-sensing properties of hexagonal tungsten oxide nanorods