Investigation of CO2 reaction with copper oxide nanoparticles for room temperature gas sensing

Abstract: The sensing of CO2 at room temperature enables the prospects towards low power and low cost CO2 gas sensors and has a high demand in both industrial and domestic applications. In this work we report a detailed work function read out (Kelvin probe) based analysis on copper oxide nanoparticles (CuO-NPs) as a new CO2 gas sensitive material. The reversible interactions of CO2 with the thick CuO-NPs layer result in a work function change of about 42 mV for dry air and approximately 97 mV for humid conditions (r.h. = 20%), at a CO2 concentration step of 400 to 4000 ppm. The CO2 gas sensing mechanism at room temperature is studied by Fourier transform infrared (FTIR) spectroscopy and explained by thermodynamical calculations. The correlation found between the FTIR spectrum and thermodynamical studies suggest the reversible formation of hydroxocarbonates (malachite, azurite) which is responsible for the gas sensing effect. Moreover, the results concerning long term signal stability over time present suitability towards indoor gas sensing applications. The results indicated in this paper give a new direction to metal oxide based nanoparticles as sufficiently fast and sensitive ambient CO2 detecting materials

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch
Anmerkungen
Journal of material chemistry / A. 4 (2016), 5294-5302, DOI 10.1039/C5TA09089J, issn: 2050-7496
IN COPYRIGHT http://rightsstatements.org/page/InC/1.0 rs

Klassifikation
Ingenieurwissenschaften und Maschinenbau

Ereignis
Veröffentlichung
(wo)
Freiburg
(wer)
Universität
(wann)
2016
Urheber
Beteiligte Personen und Organisationen
Professur für Sensoren
Freiburger Materialforschungszentrum
Technische Fakultät
Albert-Ludwigs-Universität Freiburg

DOI
10.1039/C5TA09089J
URN
urn:nbn:de:bsz:25-freidok-122373
Rechteinformation
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Letzte Aktualisierung
25.03.2025, 13:46 MEZ

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Beteiligte

Entstanden

  • 2016

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