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Humidity and CO2 gas sensing properties of double-layer graphene
KTH Royal Inst Technol, Sch Elect Engn, Dept Micro & Nanosyst, SE-10044 Stockholm, Sweden..
KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, Elect 229, SE-16440 Kista, Sweden.;KTH Royal Inst Technol, Swedish E Sci Res Ctr SeRC, SE-10044 Stockholm, Sweden..
KTH Royal Inst Technol, Sch Informat & Commun Technol, Dept Integrated Devices & Circuits, SE-16440 Kista, Sweden..
KTH Royal Inst Technol, Sch Informat & Commun Technol, Dept Integrated Devices & Circuits, SE-16440 Kista, Sweden..
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2018 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 127, p. 576-587Article in journal (Refereed) Published
Abstract [en]

Graphene has interesting gas sensing properties with strong responses of the graphene resistance when exposed to gases. However, the resistance response of double-layer graphene when exposed to humidity and gasses has not yet been characterized and understood. In this paper we study the resistance response of double-layer graphene when exposed to humidity and CO2, respectively. The measured response and recovery times of the graphene resistance to humidity are on the order of several hundred milliseconds. For relative humidity levels of less than similar to 3% RH, the resistance of double-layer graphene is not significantly influenced by the humidity variation. We use such a low humidity atmosphere to investigate the resistance response of double-layer graphene that is exposed to pure CO2 gas, showing a consistent response and recovery behaviour. The resistance of the double-layer graphene decreases linearly with increase of the concentration of pure CO2 gas. Density functional theory simulations indicate that double-layer graphene has a weaker gas response compared to single-layer graphene, which is in agreement with our experimental data. Our investigations contribute to improved understanding of the humidity and CO2 gas sensing properties of double-layer graphene which is important for realizing viable graphene-based gas sensors in the future.

Place, publisher, year, edition, pages
2018. Vol. 127, p. 576-587
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-345050DOI: 10.1016/j.carbon.2017.11.038ISI: 000417484000065OAI: oai:DiVA.org:uu-345050DiVA, id: diva2:1188654
Funder
EU, European Research Council, 277879VINNOVASwedish Research Council, 2015-05112Carl Tryggers foundation , 14: 105Swedish Energy Agency, STEM P40147-1Available from: 2018-03-08 Created: 2018-03-08 Last updated: 2018-03-08Bibliographically approved

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Delin, Anna

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