Please use this identifier to cite or link to this item: https://dspace.ctu.edu.vn/jspui/handle/123456789/30022
Title: Ammonia gas sensing properties at low temperature of graphene oxide/tungsten oxide nanobricks nanocomposities
Authors: 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
Keywords: GO
Tungsten oxide nanobricks
Nanocomposite
Low-resistance gas sensor
Issue Date: 2020
Series/Report no.: Vietnam Journal of Science and Technology;Vol.58(03) .- P.282-295
Abstract: Nanocomposites of graphene oxide (GO) and tungsten oxide (WO3) nanobricks were 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 were studied at low temperatures (50, 100 and 150oC) with the static gas-testing system. The co-appearance and the strong interaction between graphene oxideand tungsten oxide in the nanocomposite were 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 50oC to 150oC, the response of sensors switches from the p-type (at 50oC) to n-type (at 150oC) behavior. At 150oC, 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.% GOat 150oC, respectively.The 0.5 wt.% GO/WO3-based sensor shows low response but low working resistance, shorter response and recovery times (20 s and 280 s, respectively) which is promising for low power-consumption gas sensors.
URI: https://dspace.ctu.edu.vn/jspui/handle/123456789/30022
ISSN: 2525-2518
Appears in Collections:Vietnam journal of science and technology

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