title: 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.
authors.affiliation: Department of Chemical and Biomolecular Engineering, University of Connecticut Storrs, CT, USA.
authors.forename: Xiangcheng
authors.initials: X
authors.lastname: Sun
authors.affiliation: Department of Chemical and Biomolecular Engineering, University of Connecticut Storrs, CT, USA.
authors.forename: Yixin
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Materials Science and Engineering, University of Connecticut Storrs, CT, USA ; Institute of Materials Science, University of Connecticut Storrs, CT, USA.
authors.forename: Haiyong
authors.initials: H
authors.lastname: Gao
authors.affiliation: Department of Materials Science and Engineering, University of Connecticut Storrs, CT, USA ; Institute of Materials Science, University of Connecticut Storrs, CT, USA.
authors.forename: Pu-Xian
authors.initials: PX
authors.lastname: Gao
authors.affiliation: Department of Chemical and Biomolecular Engineering, University of Connecticut Storrs, CT, USA.
authors.forename: Yu
authors.initials: Y
authors.lastname: Lei
keywords: NiO nanoparticles; bimodular; high temperature; oxygen sensing; potentiometric; resistance