Ultrasensitive gas sensor based on hollow tungsten trioxide-nickel oxide (WO3-NiO) nanoflowers for fast and selective xylene detection
Ultrasensitive gas sensor based on hollow tungsten trioxide-nickel oxide (WO3-NiO) nanoflowers for fast and selective xylene detection
复制标题
基于空心三氧化钨-氧化镍 (WO3-NiO) 纳米花的超灵敏气体传感器，用于快速、选择性二甲苯检测
DOI：
10.1016/j.jcis.2018.10.010
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发表时间：
2019-02-01
影响因子：
9.9
通讯作者：
Lu, Geyu
中科院分区：
文献类型：
--
作者：
Gao, Hongyu;Yu, Qi;Lu, Geyu
In this work, 5-20 at% gas-accessible WO3-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 WO3-NiO hollow nanostructures showed much larger BET surface areas (168.0-203.8 m(2) g(-1),) than that of the pure NiO (45.9 m(2) g(-1)). In the comprehensive gas sensing test, the gas device based on 10 at% WO3-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% WO3-NiO based sensor also showed superior xylene selectivity against other interfering gases in a wide temperature range (250-350 degrees C). Especially at the optimal 300 degrees C, the 50-ppm xylene sensitivity was 8.1 and 10.3 times higher than that of 50-ppm representative acetone (S-xylene/S-acetone = 8.1) and ethanol (S-xylene/S-ethanol = 10.3) gases, respectively. The mechanisms for the excellent xylene sensing performance were also discussed. (C) 2018 Elsevier Inc. All rights reserved.
