Preparation and gas-sensing performances of ZnO/CuO rough nanotubular arrays for low-working temperature H2S detection

The Use of Copper Oxide Thin Films in Gas-Sensing Applications

“…The sensors were prepared with two different morphologies: nanotubes and nanorods. The sensitivity in both cases was comparable; however, the response time (20 ppm H 2 S) was 37 s and 122 s, respectively [65]. The lowest operating temperature (40 • C) was obtained for gas sensors based on CuO doped with Pt [26].…”

“…The same authors in [25] presented CuO nanoflowers doped with 1.25 wt % Pd, where the optimal temperature was equal to 80 °C and the response was 123.4 to 50 ppm H2S (pure CuO exhibited 15.7). Sensors working at 50 °C were developed by Li et al [65]. They were based on nanotubular arrays composed of hexagonal ZnO and external monoclinic CuO shells.…”

“…• C and the response was 123.4 to 50 ppm H 2 S (pure CuO exhibited 15.7). Sensors working at 50 • C were developed by Li et al [65]. They were based on nanotubular arrays composed of hexagonal ZnO and external monoclinic CuO shells.…”

H2S detection at low temperatures by Cu2O/Fe2O3 heterostructure ordered array sensors

“…The heterointerface conductance modulation (HICM) of heterostructure nanoarrays has been proved to be an effective sensing mechanism for low temperature gas detection. [10][11][12] The heterointerface barrier is sensitive to the carrier concentration; thus, a signicant conductance modulation can be obtained even in the case of a small change in the carrier concentration. More importantly, the modulation is almost impervious to temperature.…”

“…Furthermore, H 2 S sensing based on the sulphurization reaction of H 2 S and Cu x O has also been proposed. 11,13,14 The formation of metallic copper sulde (Cu x S) conducting channels (CSCC) is bound to cause an obvious change in conductance. Because of the temperature independence and the sulphurization reaction, the sensors based on the Cu x O nanostructures exhibit superior selectivity and sensitivity at low temperatures.…”