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Performance tuning of gas sensors based on epitaxial graphene on silicon carbide
Linköpings universitet, Institutionen för fysik, kemi och biologi, Sensor- och aktuatorsystem. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tillämpad sensorvetenskap. Linköpings universitet, Tekniska fakulteten.
Not Found:Linkoping Univ, IFM, Appl Sensor Sci Unit, Linkoping, Sweden.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Plasma och beläggningsfysik. Linköpings universitet, Tekniska fakulteten.
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2018 (engelsk)Inngår i: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 153, s. 153-158Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In this study, we investigated means of performance enhancement in sensors based on epitaxial graphene on silicon carbide (SiC). Epitaxially grown graphene on SiC substrates were successfully decorated with metal oxide nanoparticles such as TiO2 and Fe3O4 using hollow cathode pulsed plasma sputtering. Atomic Force Microscopy and Raman data verified that no damage was added to the graphene surface. It could be shown that it was easily possible to detect benzene, which is one of the most dangerous volatile organic compounds, with the Fe3O4 decorated graphene sensor down to an ultra-low concentration of 5 ppb with a signal to noise ratio of 35 dB. Moreover, upon illumination with a UV light LED (265 nm) of the TiO2 decorated graphene sensor, the sensitivity towards a change of oxygen could be enhanced such that a clear sensor response could be seen which is a significant improvement over dark conditions, where almost no response occurred. As the last enhancement, the time derivative sensor signal was introduced for the sensor data evaluation, testing the response towards a change of oxygen. This sensor signal evaluation approach can be used to decrease the response time of the sensor by at least one order of magnitude. (C) 2018 Elsevier Ltd. All rights reserved.

sted, utgiver, år, opplag, sider
ELSEVIER SCI LTD , 2018. Vol. 153, s. 153-158
Emneord [en]
Epitaxial graphene; Metal oxide nanoparticles; Gas sensor; UV light; Derivative sensor signal; Benzene
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-149676DOI: 10.1016/j.matdes.2018.04.087ISI: 000436433600016OAI: oai:DiVA.org:liu-149676DiVA, id: diva2:1235317
Merknad

Funding Agencies|Swedish Foundation for Strategic research (SSF) [GMT14-0077]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]; Centre in Nano science and technology (CeNano)

Tilgjengelig fra: 2018-07-25 Laget: 2018-07-25 Sist oppdatert: 2019-09-23
Inngår i avhandling
1. Towards a versatile gas sensing platform with epitaxial graphene
Åpne denne publikasjonen i ny fane eller vindu >>Towards a versatile gas sensing platform with epitaxial graphene
2019 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The work presented in this thesis focuses on how to utilize epitaxially grown graphene on SiC as a basis for ultra-sensitive gas sensor. Several approaches have been tested and evaluated to increase the sensitivity, selectivity, speed of response and stability and of the graphene based gas sensors with a focus on air quality monitoring applications. The graphene surfaces have been functionalized with different metal oxide nanoparticles and nanolayers using hollow-cathode sputtering and pulsed laser deposition. The modified surface was investigated towards its topography, integrity and chemical composition with characterization methods such as AFM, Raman and XPS. Moreover, the binding energy was calculated with density functional theory for benzene and formaldehyde when reacting with pristine epitaxial graphene and iron oxide nanoparticle decorated graphene to verify the usefulness of this approach. The impact of environmental influences such as operating temperature, relative humidity and UV irradiation towards sensing properties was investigated as well. To further decrease time constants, the first-order time-derivative of the sensor’s resistance is introduced as an alternative sensor signal and evaluated towards its applicability.

Applying these methods in laboratory conditions, sensors with a quantitative readout of single ppb benzene and formaldehyde were developed and time constants of less than one minute could be achieved with the first-order time-derivative signal. These results show promise to fill the existing gap of low-cost but highly sensitive and fast gas sensors for air quality monitoring.

sted, utgiver, år, opplag, sider
Linköping: Linköping University Electronic Press, 2019. s. 81
Serie
Linköping Studies in Science and Technology. Licentiate Thesis, ISSN 0280-7971 ; 1851
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-160482 (URN)10.3384/lic.diva-160482 (DOI)9789175190105 (ISBN)
Presentation
2019-10-04, Planck, F Building, Campus Valla, Linköping, 09:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2019-09-23 Laget: 2019-09-23 Sist oppdatert: 2019-09-30bibliografisk kontrollert

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