We report for the first time the doping of WO3 sensing elements with a non-noble metal carbon composite, namely a nickel metal nanoparticles-carbon composite (Ni@rGO). Previous work with WO3 had used either NiO (as part of the WO3 lattice) or carbon alone or Pd-surface decorated WO3 (Pd@WO3) or Pd or Pt@carbon@WO3. We demonstrate the gas response for pure WO3, rGO-doped WO3 and Ni@rGO doped WO3 sensing elements towards NO2 (10 ppm) and acetone (35,000 ppm) in air. The addition of 0.35 wt% Ni@rGO composite to WO3 enables the increase of the sensory response by more than 1.6 times for NO2 vapors as well as 4 times regarding acetone vapors (n-type response).
Keywords: gas sensing, magnetic measurements, nickel nanoparticles, reduced graphene oxide, tungsten oxide
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Simon, I.; Savitsky, A.; Mülhaupt, R.; Pankov, V.; Janiak, C. Beilstein Arch. 2020, 2020145. doi:10.3762/bxiv.2020.145.v1
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