Bimodular high temperature planar oxygen gas sensor

Abstract

A bimodular planar O2 sensor was fabricated using NiO nanoparticles (NPs) thin film coated yttria-stabilized zirconia (YSZ) substrate. The thin film was prepared by radio frequency (r.f.) magnetron sputtering of NiO on YSZ substrate, followed by high temperature sintering. The surface morphology of NiO NPs film was characterized by atomic force microscope (AFM) and scanning electron microscope (SEM). X-ray diffraction (XRD) patterns of NiO NPs thin film before and after high temperature O2 sensing demonstrated that the sensing material possesses a good chemical and structure stability. The oxygen detection experiments were performed at 500, 600, and 800°C using the as-prepared bimodular O2 sensor under both potentiometric and resistance modules. For the potentiometric module, a linear relationship between electromotive force (EMF) output of the sensor and the logarithm of O2 concentration was observed at each operating temperature, following the Nernst law. For the resistance module, the logarithm of electrical conductivity was proportional to the logarithm of oxygen concentration at each operating temperature, in good agreement with literature report. In addition, this bimodular sensor shows sensitive, reproducible and reversible response to oxygen under both sensing modules. Integration of two sensing modules into one sensor could greatly enrich the information output and would open a new venue in the development of high temperature gas sensors.

Visible Light Degradation of Naproxen by Enhanced Photocatalytic Activity of NiO and NiS, Scavenger Study and Focus on Catalyst Support and Magnetization

“…for comparison. Besides the absorption bands of Fe 3 O 4 @PPY, which have been described previously , the stretching shoulder band and bending vibration band of NiO were, respectively, observed at 626 and 562 cm −1 indicating the presence of NiO on the surface of the support .…”

Hydrothermal Synthesis of Hierarchical Ultrathin NiO Nanoflakes for High-Performance CH4 Sensing

“…Nickel oxide NiO (Sun et al, 2014 ) is a significant p-type semiconductor, and has been widely used as catalyst (Yu et al, 2015 ), lithium-ion battery (Gu et al, 2016 ; Long et al, 2018 ), gas sensor (Wang et al, 2016 ; Zhou et al, 2018b ), magnetic material (Cui et al, 2011 ), and so on. In recent years, many researchers have reported that NiO can be applied to fabricate high performance gas sensors for detecting some special gases such as hydrogen (Sta et al, 2016 ), NO 2 (Hoa and El-Safty, 2011 ), ethanol (Miao et al, 2017 ), etc.…”

Photocatalytic activity of NiS, NiO and coupled NiS–NiO for degradation of pharmaceutical pollutant cephalexin under visible light

“…3c and d . 23 No diffraction line observed for PPY because of the amorphous nature of this compound. 24 The average particle sizes of Fe 3 O 4 , NiO and NiS were calculated by Scherrer's equation.…”