Room temperature NO2-sensing properties of hexagonal tungsten oxide nanorods

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

中国物理B ›› 2017, Vol. 26 ›› Issue (2): 20701-020701.doi: 10.1088/1674-1056/26/2/020701

Room temperature NO₂-sensing properties of hexagonal tungsten oxide nanorods

Yaqiao Wu(武雅乔), Ming Hu(胡明), Yuming Tian(田玉明)

1 School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, China;
2 Taiyuan University of Science and Technology, Taiyuan 030024, China

收稿日期:2016-08-30 修回日期:2016-10-21 出版日期:2017-02-05 发布日期:2017-02-05
通讯作者: Ming Hu E-mail:huming@tju.edu.cn
基金资助:
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).

Room temperature NO₂-sensing properties of hexagonal tungsten oxide nanorods

Yaqiao Wu(武雅乔)^1,2, Ming Hu(胡明)¹, Yuming Tian(田玉明)²

1 School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, China;
2 Taiyuan University of Science and Technology, Taiyuan 030024, China

Received:2016-08-30 Revised:2016-10-21 Online:2017-02-05 Published:2017-02-05
Contact: Ming Hu E-mail:huming@tju.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: WO₃ nanorods, thermal treatment, NO₂ gas sensor, room temperature

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.

Key words: WO₃ nanorods, thermal treatment, NO₂ gas sensor, room temperature

中图分类号: (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)

07.07.Df

78.67.Qa (Nanorods) 61.46.Df (Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))

武雅乔, 胡明, 田玉明. Room temperature NO₂-sensing properties of hexagonal tungsten oxide nanorods[J]. 中国物理B, 2017, 26(2): 20701-020701.

Yaqiao Wu(武雅乔), Ming Hu(胡明), Yuming Tian(田玉明). Room temperature NO₂-sensing properties of hexagonal tungsten oxide nanorods[J]. Chin. Phys. B, 2017, 26(2): 20701-020701.

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Room temperature NO₂-sensing properties of hexagonal tungsten oxide nanorods

Room temperature NO₂-sensing properties of hexagonal tungsten oxide nanorods

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