Wu-bin Gao, Yun-han Ling, Xu Liu, and Jia-lin Sun, Simple point contact WO3 sensor for NO2 sensing and relevant impedance analysis, Int. J. Miner. Metall. Mater., 19(2012), No. 12, pp. 1142-1148. https://doi.org/10.1007/s12613-012-0683-2
Cite this article as:
Wu-bin Gao, Yun-han Ling, Xu Liu, and Jia-lin Sun, Simple point contact WO3 sensor for NO2 sensing and relevant impedance analysis, Int. J. Miner. Metall. Mater., 19(2012), No. 12, pp. 1142-1148. https://doi.org/10.1007/s12613-012-0683-2
Wu-bin Gao, Yun-han Ling, Xu Liu, and Jia-lin Sun, Simple point contact WO3 sensor for NO2 sensing and relevant impedance analysis, Int. J. Miner. Metall. Mater., 19(2012), No. 12, pp. 1142-1148. https://doi.org/10.1007/s12613-012-0683-2
Citation:
Wu-bin Gao, Yun-han Ling, Xu Liu, and Jia-lin Sun, Simple point contact WO3 sensor for NO2 sensing and relevant impedance analysis, Int. J. Miner. Metall. Mater., 19(2012), No. 12, pp. 1142-1148. https://doi.org/10.1007/s12613-012-0683-2
A simple and new point contact tungsten trioxide (WO3) sensor, which can be prepared by the oxidation of tungsten filaments via in-situ induction heating, likely detects low concentration (ppm level) environmental pollutants such as NO2. X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) were applied to characterize the phase and the microstructure of the samples, respectively. It was found that the synthesized WO3 films exhibited a monoclinic phase and were composed of hierarchical microcrystals and nanocrystals. The point contact WO3 sensor (W-WO3-W) showed rectifying characteristics and an ideal sensing performance of about 110℃. A single semicircle in Nyquist plots was recorded by electrochemical impedance spectroscopy (EIS) at a relatively low temperature of 150℃ but faded away above 200℃, which revealed that the sensing process was governed by a determining factor, i.e., grain boundaries at the contact site.
A simple and new point contact tungsten trioxide (WO3) sensor, which can be prepared by the oxidation of tungsten filaments via in-situ induction heating, likely detects low concentration (ppm level) environmental pollutants such as NO2. X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) were applied to characterize the phase and the microstructure of the samples, respectively. It was found that the synthesized WO3 films exhibited a monoclinic phase and were composed of hierarchical microcrystals and nanocrystals. The point contact WO3 sensor (W-WO3-W) showed rectifying characteristics and an ideal sensing performance of about 110℃. A single semicircle in Nyquist plots was recorded by electrochemical impedance spectroscopy (EIS) at a relatively low temperature of 150℃ but faded away above 200℃, which revealed that the sensing process was governed by a determining factor, i.e., grain boundaries at the contact site.
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