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  • Manuscript-accepted

    Rights statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sensors, copyright ©2020 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acssensors.0c01129

    Accepted author manuscript, 587 KB, PDF document

    Embargo ends: 9/09/21

    Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License

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First-Principles Algorithm for Air Quality Electrochemical Gas Sensors

Research output: Contribution to journalLetterpeer-review

Published
<mark>Journal publication date</mark>25/09/2020
<mark>Journal</mark>ACS Sensors
Issue number9
Volume5
Number of pages5
Pages (from-to)2742-2746
Publication StatusPublished
Early online date9/09/20
<mark>Original language</mark>English

Abstract

We report here a simple approach that allows for rapid mapping of raw voltage readings to concentrations for parts-per-billion level air quality electrochemical sensors. The key step is the introduction of an auxiliary sensor and then covering it with a thin Nafion membrane, one that is well-known for its both highly efficient and selective permeation of water vapor. This sensor captures any signal that is induced by changes of relative humidity, and such a signal can then be used to rapidly correct for drifts of the main sensor which sees both the target gas and the ambient water vapor. The whole process is entirely based on first principles, preserves physical clarity, is very amenable for implementation by routine sensor users, and delivers data that compare favorably with those from reference instruments. We also suggest that this double-sensor setup can be further condensed into one sensor in which one of the electrodes is coated by Nafion and exposed to ambient air in the same way as the normal sensing electrode.

Bibliographic note

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sensors, copyright ©2020 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acssensors.0c01129