NO and NO2 sensing properties of WO3 and Co3O4 based gas sensors.
TLDR
Semiconductor-based gas sensors that use n-type WO3 or p-type Co3O4 powder were fabricated and their gas sensing properties toward NO2 or NO (0.5–5 ppm in air) were investigated and no clear differences between the chemical states of the metal oxide surface exposed to NO 2 or NO could be detected from the DRIFT spectra.Abstract:
Semiconductor-based gas sensors that use n-type WO3 or p-type Co3O4 powder were fabricated and their gas sensing properties toward NO2 or NO (0.5–5 ppm in air) were investigated at 100 °C or 200 °C. The resistance of the WO3-based sensor increased on exposure to NO2 and NO. On the other hand, the resistance of the Co3O4-based sensor varied depending on the operating temperature and the gas species. The chemical states of the surface of WO3 or those of the Co3O4 powder on exposure to 1 ppm NO2 and NO were investigated by diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. No clear differences between the chemical states of the metal oxide surface exposed to NO2 or NO could be detected from the DRIFT spectra.read more
Citations
More filters
Journal ArticleDOI
Alveolus-Inspired Active Membrane Sensors for Self-Powered Wearable Chemical Sensing and Breath Analysis.
Yuanjie Su,Yuanjie Su,Jianjun Wang,Bo Wang,Tiannan Yang,Yang Boxi,Guangzhong Xie,Yihao Zhou,Songlin Zhang,Huiling Tai,Zhixiang Cai,Guorui Chen,Yadong Jiang,Long Qing Chen,Jun Chen +14 more
TL;DR: An alveolus-inspired membrane sensor (AIMS) is developed for self-powered wearable nitrogen dioxide detection and personal physiological assessment and renders the community a deep understanding of the gas sensing mechanisms.
Journal ArticleDOI
The advances of Co3O4 as gas sensing materials: A review
Junming Xu,Jipeng Cheng +1 more
TL;DR: An overview of the literature on gas sensing of Co 3 O 4 and its composites can be found in this article, where a review of the gas sensing properties of these composites is presented.
Journal ArticleDOI
Ultrasensitive WO3 gas sensors for NO2 detection in air and low oxygen environment
TL;DR: In this article, the performance of a tungsten oxide-based low power MEMS gas sensor to nitrogen dioxide at low levels of ambient oxygen has been investigated and the optimal operating temperature was determined to be ca. 350 °C and so easily within the range of a MEMS based SOI CMOS substrate.
Journal ArticleDOI
Facile fabrication of Fe3O4 and Co3O4 microspheres and their influence on the thermal decomposition of ammonium perchlorate
Yifu Zhang,Changgong Meng +1 more
TL;DR: In this article, the catalytic properties of the as-obtained Fe 3 O 4 and Co 3 o 4 microspheres on the thermal decomposition of ammonium perchlorate (AP) were evaluated by TGA/DTA methods.
Journal ArticleDOI
The oxidizing effect of humidity on WO3 based sensors
TL;DR: In this article, a mechanism for the surface reaction between WO 3 and humidity can be concluded from experimental results, such as DC resistance measurements and operando diffuse reflectance infrared Fourier transform spectroscopy.
References
More filters
Journal ArticleDOI
Semiconducting metal oxides as sensors for environmentally hazardous gases
Khatcharin Wetchakun,T. Samerjai,Nittaya Tamaekong,Chaikarn Liewhiran,Chawarat Siriwong,Viruntachar Kruefu,Anurat Wisitsoraat,Adisorn Tuantranont,Sukon Phanichphant +8 more
TL;DR: In this paper, the authors extensively review the development of semiconductor metal oxide gas sensors for environmentally hazardous gases including NO2, NO, N2O, H2S, CO, NH3, CH4, SO2 and CO2.
Journal ArticleDOI
Nox gas sensing characteristics of wo3 thin films activated by noble metals (pd, pt, au) layers
TL;DR: In this paper, a WO3-based gas sensor has been fabricated by reactive reactive rf sputtering on glass substrates, where Palladium (Pd), platinum (Pt), gold (Au), noble metals (100-600 A), and Al layers (1500 A) were sputtered on top of them as upper electrodes for sensor output.
Journal ArticleDOI
CuO nanowire gas sensors for air quality control in automotive cabin
TL;DR: In this paper, the gas sensing characteristics of the p-type oxide semiconductor were investigated and the sensor showed two opposite NO2 sensing behaviors; the resistance decreased upon exposure to 30 −100 -ppm NO2, but increased upon contact with ≤ 5 −5 −ppm No2.
Journal ArticleDOI
Tungsten Oxide-Based Semiconductor Sensor Highly Sensitive to NO and NO2
TL;DR: In this article, a sintered sensor element based on WO3 was found to be very sensitive to NO and NO2 at 300 °C. The sensitivity, defined as the ratio of the resistance in the gases to that in air, was as high as 31 and 97 to 200 ppm NO and 80 ppm NO2.
Journal ArticleDOI
Gas-kinetic interactions of nitrous oxides with SnO2 surfaces
TL;DR: In this paper, the kinetics of interaction of nitrous oxides (NOx) with sensor surfaces were investigated and it was shown that NO, similar to CO, undergoes a simple reducing interaction with SnO2 sensor surfaces producing a conductivity increase.
Related Papers (5)
Highly sensitive and selective gas sensors using p-type oxide semiconductors: Overview
Hyo Joong Kim,Jong Heun Lee +1 more