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Mastering VOC detection for better indoor air quality
Linköping University, Department of Physics, Chemistry and Biology, Applied Sensor Science. Linköping University, The Institute of Technology. (Applied Sensor Science)
Linköping University, Department of Physics, Chemistry and Biology, Applied Sensor Science. Linköping University, The Institute of Technology. Saarland University, Lab for Measurement Technology, Germany. (Applied Sensor Science)
Saarland University, Lab for Measurement Technology, Germany.
Saarland University, Germany. (Lab for Measurement Technology)
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2014 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

In this study, we use two different sensor technologies based on gas sensitive silicon carbide field effect transistors (SiC-FETs) and epitaxial graphene on SiC (EG/SiC) for highly sensitive and selective detection of trace amounts of three hazardous volatile organic compounds (VOCs), i.e. formaldehyde (CH2O), benzene (C6H6), and naphthalene (C10H8), present in indoor environments in concentrations of health concern.

Iridium and platinum are used as sensing layers for the gate contacts. The FET sensors are operated at high temperature, under static and dynamic conditions. Excellent detection limits of 10 ppb for CH2O, about 1 ppb for C6H6, and below 0.5 ppb for C10H8 are measured at 60 % relative humidity (r.h.) [1]. The selectivity of the sensors is increased by temperature cycled operation and data evaluation based on multivariate statistics. Discrimination of CH2O, C6H6, and C10H8 independent of the level of background humidity is possible with a very high cross-validation rate up to 90 % [2]. These results are very encouraging for indoor air quality control, being below the threshold limits recommended by the WHO guidelines.

Graphene-based chemical sensors offer the advantage of extreme sensitivity due to graphene’s unique electronic properties and the fact that every single atom is at the surface and available to interact with gas molecules. For this reason, uniform monolayer graphene is crucial [3], which is guaranteed by our optimized epitaxial growth process. Graphene-based chemical gas sensors normally show ultra-high sensitivity to certain gas molecules but suffer from poor selectivity. Functionalization or modification of the graphene surface can improve selectivity, but most such measures result in poor reproducibility. We demonstrate reproducible, non-destructive means of graphene surface decoration with nanostructured metals and metal oxides, and study their effect on the gas interactions at the graphene surface.

Place, publisher, year, edition, pages
www.eunetair.it , 2014.
Keyword [en]
chemical sensors, silicon carbide, graphene, field effect transistor, volatile organic compounds
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:liu:diva-115565OAI: oai:DiVA.org:liu-115565DiVA: diva2:795548
Conference
3rd Scientific Meeting of COST Action TD1105 EuNetAir, December 3-5, 2014, Istanbul, Turkey
Projects
SENSIndoorFunMat
Funder
EU, FP7, Seventh Framework Programme, 604311
Available from: 2015-03-16 Created: 2015-03-16 Last updated: 2015-03-30

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Puglisi, DonatellaBur, ChristianAndersson, MikeYakimova, RositsaLloyd Spetz, AnitaEriksson, Jens

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Puglisi, DonatellaBur, ChristianAndersson, MikeYakimova, RositsaLloyd Spetz, AnitaEriksson, Jens
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