Enhancement of NH3 gas sensitivity by using WO3/MWCNT composite-based sensors

Lam Nguyen Huu, Truong Vu Duong, Tu Cong Nguyen, Bac Huu Luong, Anh Lan Luu, Chien Duc Nguyen

Abstract


Multi-walled carbon nanotubes (MWCNTs) were prepared by thermal chemical vapor deposition at 750 °C, and WO3 nanobricks with an average size of 80 nm were synthesized by a hydrothermal route. MWCNTs and WO3 were mixed at different mass ratios in dimethylformamide solution to obtain composite materials. The WO3/MWCNT composite-based sensors were used for detection of NH3 gas. The gas-sensitive properties of the sensors were compared with those of pure CNT- and WO3-based sensors. The fabricated WO3/CNT composite sensors exhibited higher response, and faster response/recovery time than the other sensors at room temperature. In this work a possible mechanism conducting to the improvement of the hybrid sensors performance is proposed.

Keywords


carbon nanotubes, WO3 nanostructures, gas sensors, chemical vapor deposition, hydrothermal method

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Published by: IOP Publishing and Vietnam Academy of Science and Technology
Frequency: Articles appear online as they are published with print copies published 4 times per year
ISSN: Print: 2043-6254; Online: 2043-6262
DOI Range: 10.1088/issn.2043-6262

© Copyright 2016 Advances in Natural Sciences: Nanoscience and Nanotechnology