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Sensing of NO2 with zirconium hydroxide via frequency-dependent electrical impedance spectroscopy

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Abstract

Zirconium hydroxide has been investigated as a candidate nitrogen dioxide dielectric sensor using impedance spectroscopy analysis. Significant changes in electronic and physical properties down to our dosage minimum of 2 ppm h have been observed. Using disc-shaped pressed pellets of Zr(OH)4 in parallel plate geometry, we observe a maximum signal shift of 35% at 2 ppm h dosage, which increases six orders of magnitude as the dosage reaches 1000 ppm h. Changes in impedance correlate with nitrogen and oxygen atomic ratio increases observed via X-ray photoelectron spectroscopy (XPS) at higher NO2 dosages. In contrast to the sharp frequency-dependent features and net impedance decreases during NO2 exposures, Zr(OH)4 exhibits a large and broad impedance increase after exposure to humid air (water vapor). The results indicate that Zr(OH)4 could be used as a selective low-cost impedance-based NO2 detector by applying frequency-dependent impedance fingerprinting.

Graphical abstract: Sensing of NO2 with zirconium hydroxide via frequency-dependent electrical impedance spectroscopy

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Publication details

The article was received on 04 Jun 2017, accepted on 26 Jul 2017 and first published on 27 Jul 2017


Article type: Communication
DOI: 10.1039/C7DT02034A
Citation: Dalton Trans., 2017, Advance Article
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    Sensing of NO2 with zirconium hydroxide via frequency-dependent electrical impedance spectroscopy

    C. R. Harris, J. R. Soliz, A. D. Klevitch, M. J. Bartz, J. A. Rossin, A. W. Fountain, A. J. Hauser and G. W. Peterson, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT02034A

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