期刊
ACS SENSORS
卷 3, 期 9, 页码 1811-1821出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.8b00544
关键词
temperature-independent sensors; oxygen gas sensors; VOx nanoflakelets; mixed-valent vanadium oxide; VOx/TiO2 nanocomposite
资金
- PSG Sons and Charities, Coimbatore
- DST-SERB [SB/S3/CE/038/2015]
Herein, we report a facile approach for the synthesis of TiO2 nanoparticles tethered on 2D mixed valent vanadium oxide (VOx/TiO2) nanoflakelets using a thermal decomposition assisted hydrothermal method and investigation of its temperature-independent performance enhancement in oxygen-sensing properties. The material was structurally characterized using XRD, TEM, Raman, DSC, and XPS analysis. The presence of mixed valent states, such as V2O5 and VO2 in VOx, and the metastable properties of VO2 have been found to play crucial roles in the temperature-independent electrical conductivity of VOx/TiO2 nanoflakelets. Though pristine VOx exhibited characteristic semiconductor-to-metal transition of monoclinic VO2, pure VOx nanoflakelets exhibited poor sensitivity toward sensing oxygen. VOx/TiO2 nanoflakelets showed a very low temperature coefficient of resistance above 150 degrees C with improved sensitivity (35 times higher than VOx for 100 ppm) toward oxygen gas. VOx/TiO2 nanoflakelets exhibited much higher response, faster adsorption and desorption toward oxygen as compared to pristine VOx beyond 100 degrees C, which endowed the sensor with excellent temperature-independent sensor properties within 150-500 degrees C. The faster adsorption and desorption after 100 degrees C led to shorter response time (3-5 s) and recovery time (7-9 s). The results suggest that 2D VOx/TiO2 can be a promising candidate for temperature-independent oxygen sensor applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据