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Platinum/Graphene Nanosheet/SiC Contacts And Their Application For Hydrogen Gas Sensing

M. Shafiei, P. Spizzirri, R. Arsat, J. Yu, J. D. Plessis, S. Dubin, R. Kaner, K. Kalantar-zadeh, W. Wlodarski
Published 2010 · Materials Science

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Pt/graphene nanosheet/SiC based devices are fabricated and characterized and their performances toward hydrogen gas are investigated. The graphene nanosheets are synthesized via the reduction of spray-coated graphite oxide deposited onto SiC substrates. Raman and X-ray photoelectron spectroscopies indicate incomplete reduction of the graphite oxide, resulting in partially oxidized graphene nanosheet layers of less than 10 nm thickness. The effects of interfaces on the nonlinear behavior of the Pt/graphene and graphene/SiC junctions are investigated. Current−voltage measurements of the sensors toward 1% hydrogen in synthetic air gas mixture at various temperatures ranging up to 100 °C are performed. From the dynamic response, a voltage shift of ∼100 mV is recorded for 1% hydrogen at a constant current bias of 1 mA at 100 °C.
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