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Graphene-Based Ammonia Sensors Functionalised with Sub-Monolayer V2O5: A Comparative Study of Chemical Vapour Deposited and Epitaxial Graphene
Univ Tartu, Estonia.
Univ Tartu, Estonia.
Univ Tartu, Estonia.
Linköping University, Department of Physics, Chemistry and Biology, Sensor and Actuator Systems. Linköping University, Faculty of Science & Engineering.
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2019 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, no 4, article id 951Article in journal (Refereed) Published
Abstract [en]

Graphene in its pristine form has demonstrated a gas detection ability in an inert carrier gas. For practical use in ambient atmosphere, its sensor properties should be enhanced with functionalisation by defects and dopants, or by decoration with nanophases of metals or/and metal oxides. Excellent sensor behaviour was found for two types of single layer graphenes: grown by chemical vapour deposition (CVD) and transferred onto oxidized silicon (Si/SiO2/CVDG), and the epitaxial graphene grown on SiC (SiC/EG). Both graphene samples were functionalised using a pulsed laser deposited (PLD) thin V2O5 layer of average thickness approximate to 0.6 nm. According to the Raman spectra, the SiC/EG has a remarkable resistance against structural damage under the laser deposition conditions. By contrast, the PLD process readily induces defects in CVD graphene. Both sensors showed remarkable and selective sensing of NH3 gas in terms of response amplitude and speed, as well as recovery rate. SiC/EG showed a response that was an order of magnitude larger as compared to similarly functionalised CVDG sensor (295% vs. 31% for 100 ppm NH3). The adsorption site properties are assigned to deposited V2O5 nanophase, being similar for both sensors, rather than (defect) graphene itself. The substantially larger response of SiC/EG sensor is probably the result of the smaller initial free charge carrier doping in EG.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 19, no 4, article id 951
Keywords [en]
ammonia; CVD graphene; epitaxial graphene on SiC; gas sensor; pulsed laser deposition; selectivity; single layer graphene; UV light activation; vanadium (V) oxide
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-155939DOI: 10.3390/s19040951ISI: 000460829200202PubMedID: 30813421OAI: oai:DiVA.org:liu-155939DiVA, id: diva2:1301298
Note

Funding Agencies|European Unions Horizon 2020 research and innovation program [785219]; EU through the European Regional Development Fund [TK141]; Estonian Ministry of Education and Science [IUT34-27, IUT2-24]; Swedish Foundation for Strategic Research (SSF) [GMT14-0077, RMA15-024]

Available from: 2019-04-01 Created: 2019-04-01 Last updated: 2019-04-01

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