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We report for the first time the combination of WO 3  sensing elements with a non-noble metal–carbon composite, namely a nickel metal nanoparticle–carbon composite (Ni@rGO). Previous work with WO 3  had used either NiO (as part of the WO 3  lattice), solely carbon, Pd-surface decorated WO 3  (Pd@WO 3 ), or Pd or Pt@carbon@WO 3 . We demonstrate the gas response for pure WO 3 , rGO/WO 3  and Ni@rGO/WO 3  sensing elements towards NO 2  and acetone in air as well as towards CO in N 2 . The addition of 0.35 wt % Ni@rGO composite to WO 3  enables the increase of the sensory response by more than 1.6 times for NO 2  vapors. The gas response towards acetone using 0.35 wt % Ni@rGO/WO 3  composite was 1.5 times greater for 3500 ppm than for 35,000 ppm acetone. For 0.35 wt % Ni@rGO/WO 3  composite and CO gas, a response time ( T  res ) of 7 min and a recovery time ( T  rec ) of 2 min was determined.

Nickel nanoparticle-decorated reduced graphene oxide/WO3 nanocomposite – a promising candidate for gas sensing

Nickel nanoparticle-decorated reduced graphene oxide/WO₃ nanocomposite – a promising candidate for gas sensing