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Volume 173, 2014
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Reduced graphene oxide and graphene composite materials for improved gas sensing at low temperature

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Abstract

Reduced graphene oxide (rGO) was investigated as a material for use in chemiresistive gas sensors. The carbon nanomaterial was transferred onto a silicon wafer with interdigital gold electrodes. Spin coating turned out to be the most reliable transfer technique, resulting in consistent rGO layers of reproducible quality. Fast changes in the electrical resistance at a low operating temperature of 85 °C could be detected for the gases NO2, CH4 and H2. Especially upon adsorption of NO2 the high signal changes allowed a minimum detection of 0.3 ppm (S/N = 3). To overcome the poor selectivity, rGO was chemically functionalized with octadecylamine, or modified by doping with metal nanoparticles such as Pd and Pt, and also metal oxides such as MnO2, and TiO2. The different response patterns for six different materials allowed the discrimination of all of the test gases by pattern recognition based on principal component analysis.

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Publication details

The article was received on 30 Apr 2014, accepted on 27 Jun 2014 and first published on 27 Jun 2014


Article type: Paper
DOI: 10.1039/C4FD00086B
Citation: Faraday Discuss., 2014,173, 403-414
  • Open access: Creative Commons BY license
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    Reduced graphene oxide and graphene composite materials for improved gas sensing at low temperature

    A. Zöpfl, M. Lemberger, M. König, G. Ruhl, F. Matysik and T. Hirsch, Faraday Discuss., 2014, 173, 403
    DOI: 10.1039/C4FD00086B

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