Ammonia gas sensing properties at low temperatures of nanocomposites of graphene oxide and tungsten oxide nanobricks

Nguyen Cong Tu, Nguyen Anh Kiet, Phung Nhat Minh, Ngo Xuan Dinh, Le Anh Tuan, Luu Thi Lan Anh, Do Duc Tho, Nguyen Huu Lam
Author affiliations

Authors

  • Nguyen Cong Tu School of Engineering Physics, Hanoi University of Science and Technology, No 1, Dai Co Viet street, Ha Noi, Viet Nam
  • Nguyen Anh Kiet School of Engineering Physics, Hanoi University of Science and Technology, No 1, Dai Co Viet street, Ha Noi, Viet Nam
  • Phung Nhat Minh School of Engineering Physics, Hanoi University of Science and Technology, No 1, Dai Co Viet street, Ha Noi, Viet Nam
  • Ngo Xuan Dinh Phenikaa University Nano Institute, Phenikaa University, Yen Nghia ward, Ha Dong district, Ha Noi, Viet Nam
  • Le Anh Tuan Phenikaa University Nano Institute, Phenikaa University, Yen Nghia ward, Ha Dong district, Ha Noi, Viet Nam
  • Luu Thi Lan Anh School of Engineering Physics, Hanoi University of Science and Technology, No 1, Dai Co Viet street, Ha Noi, Viet Nam
  • Do Duc Tho School of Engineering Physics, Hanoi University of Science and Technology, No 1, Dai Co Viet street, Ha Noi, Viet Nam
  • Nguyen Huu Lam School of Engineering Physics, Hanoi University of Science and Technology, No 1, Dai Co Viet street, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/58/3/14704

Keywords:

graphene oxide, tungsten oxide nanobricks, nanocomposite, low-resistance gas sesor, ammonia

Abstract

Nanocomposites of graphene oxide (GO) and tungsten oxide (WO3) nanobricks are synthesized by co-dispersing graphene oxide and tungsten oxide nanobricks in bi-distilled water with different weight ratios (0.1, 0.3 and 0.5 wt.% of graphene oxide). The ammonia gas sensing properties of nanocomposites are studied at low temperatures range (50, 100 and 150 oC) with the static gas-testing system. The co-appearance and the strong interaction between graphene oxide and tungsten oxide in the nanocomposite are confirmed by Raman scattering analysis. The content of GO in nanocomposite strongly affects the resistance of nanocomposite-based sensors. When the working temperature increase from 50 oC to 150 oC, the response of sensors switches from the p-type (at 50 oC) to n-type (at 150 oC) behavior. At 150 oC, the nanocomposite-based sensors show the most stable ammonia gas sensing characteristics. The working resistance of the pristine WO3 sensor reduced from 1.35 MΩ to 90, 72 and 27 kΩ when compositing with 0.1, 0.3 and 0.5 wt.% GO at 150 oC, respectively. The 0.5 wt.% GO/WO3 -based sensor shows low response but with low working resistance, shorter response and recovery times (20 s and 280 s, respectively) which is promising for low power-consumption gas sensors. 

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Published

12-05-2020

How to Cite

[1]
N. C. Tu, “Ammonia gas sensing properties at low temperatures of nanocomposites of graphene oxide and tungsten oxide nanobricks”, Vietnam J. Sci. Technol., vol. 58, no. 3, pp. 282–295, May 2020.

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Materials