Effect of bias voltage and carrier gas on the hydrogen gas-sensing properties of tungsten oxide nanobeads

Nguyen Duc Hoa; Ngoc Son Dang; Thi Thanh Le Dang; Thi Thu Hoa Nguyen; Manh Hung Chu; Van Duy Nguyen

doi:10.15625/0868-3166/15809

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Authors

Nguyen Duc Hoa International Training Institute for Materials (ITIMS), ScienceHanoi University of Science and Technology
Dang Ngoc Son International Training Institute for Materials Science, Hanoi University of Science and Technology, No.1 Dai Co Viet, Hanoi, Vietnam
Dang Thi Thanh Le International Training Institute for Materials Science, Hanoi University of Science and Technology, No.1 Dai Co Viet, Hanoi, Vietnam
Nguyen Thi Thu Hoa International Training Institute for Materials Science, Hanoi University of Science and Technology, No.1 Dai Co Viet, Hanoi, Vietnam
Chu Manh Hung International Training Institute for Materials Science, Hanoi University of Science and Technology, No.1 Dai Co Viet, Hanoi, Vietnam
Nguyen Van Duy International Training Institute for Materials Science, Hanoi University of Science and Technology, No.1 Dai Co Viet, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/0868-3166/15809

Keywords:

WO3 nanobeads, I-V characterization, H2 gas sensing properties

Abstract

We investigated the effect of bias voltage and carrier gas on the hydrogen sensing performance of tungsten oxide nanobeads. The tungsten oxide nanobeads were prepared by a template-assisted method followed by calcination. The porous single walled carbon nanotube thin film was used as sacrificed template for the deposition of tungsten, followed by thermal calcination at high temperature to oxidize W into WO₃ and to burn out the template. The crystal structures and morphology of the synthesized materials were characterized by X-ray diffraction, field-emission scanning electron microscopy, high-resolution transmission electron microscopy and Raman spectra. Hydrogen gas sensing properties were tested in air and in N₂ as refence for comparison. Our results indicated that Schottky junction was formed at the interface of WO₃ and Pt electrodes. The sensor operated under revered bias voltage processed excellent hydrogen sensing performance. In addition, the H₂ sensing performance of the WO₃ nanobeads is higher when measured in N₂ gas as reference.

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