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Graphene-based gas sensors

Mono- and bilayer graphene, epitaxially grown on SiC in the research group of Prof. Rositza Yakimova, Material Science Division, was characterized for gas sensing and shows ultra-low detection limit, less than 10 ppb of NO2. It was shown that upon exposure to electron acceptors (oxygen, water vapour, NO2) or donators (NH3), the relative Fermi level in single layer graphene suffers a greater change than that in bilayer graphene. The graphene sensor research is supported within FunMat and AFM - Strategic Faculty Grant in Advanced Functional Materials. A patent was filed regarding a smart sensor device based on graphene/ SiC. Also MAX based mono- or few layer materials like MXene (TiC) are investigated according to gas sensing properties.

Decoration by metal or metal oxide nanoparticles (e.g. TiO2) through plasma deposition processing in the group of Prof. Ulf Helmersson (grant from CeNano) enabled ultra-low detection limits of formaldehyde and benzene. Particle size contributes to selectivity.

Fig. 1. Response to <1.5 ppm NO2 (black, left Y-axis) and calculated change in carrier concentration (blue, right Y-axis) due to change in Fermi level for single- and bilayer graphene. (R. Pearce, J. Eriksson, T. Iakimov, L. Hultman, A. Lloyd Spetz and R. Yakimova, ACSnano 2013, 7 (5), 4647-4656)


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Last updated: 01/16/17