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Influence of Humidity and Different Gases on a Resistive Room Temperature NO₂ Gas Dosimeter Based on Al-Doped ZnO for ppb-Concentration Detection

Title data

Wagner, Ricarda ; Schönauer-Kamin, Daniela ; Moos, Ralf:
Influence of Humidity and Different Gases on a Resistive Room Temperature NO₂ Gas Dosimeter Based on Al-Doped ZnO for ppb-Concentration Detection.
In: Journal of The Electrochemical Society. Vol. 167 (2020) Issue 16 . - Art.Nr. 167516.
ISSN 1945-7111
DOI: https://doi.org/10.1149/1945-7111/abcb65

Official URL: Volltext

Abstract in another language

NO2 in the ppb-range can be detected at room temperature by aluminum-doped zinc oxide, whereby the sensor devices are operated as resistive gas dosimeters. In this operation mode, the dose of an analyte is measured directly and the actual analyte concentration can be determined by mathematical differentiation. It is crucial that already adsorbed analyte species do not desorb from the sensitive material and therefore their recovery time is infinite. As classically operated metal oxide sensors are known for their low selectivity, the selectivity of the sensor is investigated. The here-presented results show that the sensor can detect NO2 very selectively even at low concentrations in the low ppb range. Since it has already been reported that humidity can accelerate the desorption of gas molecules from metal oxides, furthermore, the influence of humidity on the dosimeter behavior is investigated. It is shown that the holding capability is negatively affected and the analyte desorbs faster in humid atmosphere.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 14 Dec 2020 11:58
Last Modified: 14 Dec 2020 11:58
URI: https://eref.uni-bayreuth.de/id/eprint/61028