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Detection of Ultralow Concentration NO2 in Complex Environment Using Epitaxial Graphene Sensors
Natl Phys Lab, England; Univ Surrey, England.
Natl Phys Lab, England.
Royal Holloway Univ London, England.
Chalmers Univ Technol, Sweden.
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2018 (English)In: ACS SENSORS, ISSN 2379-3694, Vol. 3, no 9, p. 1666-1674Article in journal (Refereed) Published
Abstract [en]

We demonstrate proof-of-concept graphene (a) sensors for environmental monitoring of ultralow concentration NO2 in complex environments. Robust detection in a wide range of NO2 concentrations, 10-154 ppb, was achieved, highlighting the great potential for graphene-based NO2 sensors, with applications in environmental pollution monitoring, portable monitors, automotive and mobile sensors for a global real-time monitoring network. The measurements were performed in a complex environment, combining NO2/synthetic air/water vapor, traces of other contaminants, and variable temperature in an attempt to fully replicate the environmental conditions of a working sensor. It is shown that the performance of the graphene-based sensor can be affected by coadsorption of NO2 and water on the surface at low temperatures (amp;lt;= 70 degrees C). However, the sensitivity to NO2 increases significantly when the sensor operates at 150 degrees C and the cross-selectivity to water, sulfur dioxide, and carbon monoxide is minimized. Additionally, it is demonstrated that single-layer graphene exhibits two times higher carrier concentration response upon exposure to NO2 than bilayer graphene.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 3, no 9, p. 1666-1674
Keywords [en]
epitaxial graphene; nitrogen dioxide; graphene sensors; environmental monitoring; air quality; Hall effect
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-152092DOI: 10.1021/acssensors.8b00364ISI: 000446276300010PubMedID: 30073834OAI: oai:DiVA.org:liu-152092DiVA, id: diva2:1256688
Note

Funding Agencies|EMPIR [2016NRM01 GRACE]; NMS under the IRD Graphene Project [119948]; NMS [121524]; European Unions Horizon 2020 research and innovation programme [785219]; EPSRC [EP/G037388]; University of Surrey; National Physical Laboratory; National Physical Laboratorys Directors Science and Engineering Fund

Available from: 2018-10-17 Created: 2018-10-17 Last updated: 2018-11-20

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Yakimova, Rositsa
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