Ultrasensitive gas sensor based on hollow tungsten trioxide-nickel oxide (WO-NiO) nanoflowers for fast and selective xylene detection.

Author(s) Gao, H.; Yu, Q.; Chen, K.; Sun, P.; Liu, F.; Yan, X.; Liu, F.; Lu, G.
Journal J Colloid Interface Sci
Date Published 2019 Feb 01

In this work, 5-20 at% gas-accessible WO-NiO hollow nanoflowers were synthesized through a one-step hydrothermal route and used to fabricate metal oxide semiconductor (MOS) based gas sensor. The gas-accessible WO-NiO hollow nanostructures showed much larger BET surface areas (168.0-203.8 m g) than that of the pure NiO (45.9 m g). In the comprehensive gas sensing test, the gas device based on 10 at% WO-NiO hollow microspheres exhibited the best xylene sensing performance, showing ultrahigh xylene sensitivity (354.7-50 ppm) with short response-recovery times within 1 min. (51 and 57 s respectively) and ultralow detection limit (1.5-50 ppb xylene). Additionally, the 10 at% WO-NiO based sensor also showed superior xylene selectivity against other interfering gases in a wide temperature range (250-350 °C). Especially at the optimal 300 °C, the 50-ppm xylene sensitivity was 8.1 and 10.3 times higher than that of 50-ppm representative acetone (S/S = 8.1) and ethanol (S/S = 10.3) gases, respectively. The mechanisms for the excellent xylene sensing performance were also discussed.

DOI 10.1016/j.jcis.2018.10.010
ISSN 1095-7103
Citation J Colloid Interface Sci. 2019;535:458468.

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