GS6.2 - Highly sensitive BTEX sensors based on hexagonal WO3 nanosheets
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- Gas Sensors 6 - Sensing VOCs
- Author(s)
- D. Zhang, X. Wang, Z. Cheng, J. Xu - NEST lab, Department of Chemistry, College of Science, Shanghai University, Shanghai (China)
- Pages
- 236 - 237
- DOI
- 10.5162/IMCS2018/GS6.2
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
Hexagonal WO3 (h-WO3) nanosheets for selectively sensing BTEX (benzene, toluene, ethylbenzene, and xylol) were synthesized by a facile, low-cost and environmentally friendly hydrothermal method. The structure and morphology of the products were characterized by several techniques, such as powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and high resolution transmission electron microscopy HRTEM). The results showed that the as-prepared WO3 are hexagonal nanosheets. Gas sensing tests of sideheating sensors exhibited that the h-WO3 nanosheets(NS) had a much better response to BTEX rather than other VOCs such as ethanol, acetone, formaldehyde, methanol and ammonia. At the optimal working temperature of 320 ℃, the response value of the h-WO3 nanosheets sensor to 50 ppm (parts per million ) BTEX was 8 times more than the other gases. Compared with h-WO3 nanoparticles(NP) and nanorods(NR), the h-WO3 nanosheets had the best selectivity and sensitivity for BTEX, which was 9 times more than h-WO3 nanoparticles and nanorods.