Graphene Field Effect Transistors: A Sensitive Platform for Detecting SarinClick to copy article linkArticle link copied!
- Natalia Alzate-CarvajalNatalia Alzate-CarvajalDepartment of Physics, University of Ottawa, Ottawa, Ontario K1N 9A7, CanadaMore by Natalia Alzate-Carvajal
- Jaewoo ParkJaewoo ParkDepartment of Physics, University of Ottawa, Ottawa, Ontario K1N 9A7, CanadaMore by Jaewoo Park
- Martin PykalMartin PykalRegional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, 771 46 Olomouc, Czech RepublicMore by Martin Pykal
- Petr LazarPetr LazarRegional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, 771 46 Olomouc, Czech RepublicMore by Petr Lazar
- Ranjana RautelaRanjana RautelaDepartment of Physics, University of Ottawa, Ottawa, Ontario K1N 9A7, CanadaMore by Ranjana Rautela
- Samantha ScarfeSamantha ScarfeDepartment of Physics, University of Ottawa, Ottawa, Ontario K1N 9A7, CanadaMore by Samantha Scarfe
- Lukas ScarfeLukas ScarfeDepartment of Physics, University of Ottawa, Ottawa, Ontario K1N 9A7, CanadaMore by Lukas Scarfe
- Jean-Michel MénardJean-Michel MénardDepartment of Physics, University of Ottawa, Ottawa, Ontario K1N 9A7, CanadaMore by Jean-Michel Ménard
- Michal OtyepkaMichal OtyepkaRegional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, 771 46 Olomouc, Czech RepublicCzech Republic & IT4Innovations, VSB − Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava-Poruba, Czech RepublicMore by Michal Otyepka
- Adina Luican-Mayer*Adina Luican-Mayer*(A.L.-M.) Email: [email protected]Department of Physics, University of Ottawa, Ottawa, Ontario K1N 9A7, CanadaMore by Adina Luican-Mayer
Abstract

Real time, rapid, and accurate detection of chemical warfare agents (CWA) is an ongoing security challenge. Typical detection methods for CWA are adapted from traditional chemistry techniques such as chromatography and mass spectrometry, which lack portability. Here, we address this challenge by evaluating graphene field effect transistors (GFETs) as a sensing platform for sarin gas using both experiment and theory. Experimentally, we measure the sensing response of GFETs when exposed to dimethyl methylphosphonate (DMMP), a less toxic compound used as simulant due to its chemical similarities to sarin. We find low detection limits of 800 ppb, the highest sensitivity reported up to date for this type of sensing platform. In addition to changes in resistance, we implement an in-operando monitor of the GFETs characteristics during and after exposure to the analyte, which gives insights into the graphene–DMMP interactions. Moreover, using theoretical calculations, we show that DMMP and sarin interact similarly with graphene, implying that GFETs should be highly sensitive to detecting sarin. GFETs offer a versatile platform for the development of compact and miniaturized devices that can provide real-time detection of dangerous chemicals in the local environment.
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