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Towards a versatile gas sensing platform with epitaxial graphene

Marius Rodner, 1991- (Författare), Jens Eriksson, 1979- (Handledare), Kajsa Uvdal, 1961- (Handledare), Roland Pohle (Opponent)

URI http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-160482, URN urn:nbn:se:liu:diva-160482, DOI 10.3384/lic.diva-160482

Linköpings universitet. Institutionen för fysik, kemi och biologi (Utgivare), Linköpings universitet Tekniska fakulteten (Utgivare)

utgivning

Linköping : Linköping University, Department of Physics, Chemistry and Biology, 2019

1 onlineresurs (x, 81 sidor)

Seriemedlemskap

Linköping studies in science and technology. Thesis · ISSN 0280-7971 · Linköping studies in science and technology. Licentiate thesis ; 1851

Marius Rodner

Onlineresurs

Digital resurs · 2 bibliotek

Finns online:

Sammanfattning och ramberättelse från Linköping University Electronic Press

ämne

Natural Sciences, Chemical Sciences, Materials Chemistry, Naturvetenskap, Kemi, Materialkemi, Gasanalys, Grafen, Tunna skikt (ytfysik), Nanoteknik, Mätinstrument--tekniska aspekter

Annat bärarformat

Towards a versatile gas sensing platform with epitaxial graphene · ISBN 9789175190105 · häftad

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Sammanfattning

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.