Preparation and hydrogen sulfide gas-sensing performances of RuO2/NaBi(MoO4)2 nanoplates

The NaBi(MoO4)2 nanoplates and RuO2/NaBi(MoO4)2 composites were synthesized by hydrothermal processes. XRD, SEM, TEM were employed to determine their phase composition and morphology, and the specific surface areas were obtained by BET. The results showed the NaBi(MoO4)2 nanoplates were tetragonal scheelite phase with average crystalline size of 25 nm. The NaBi(MoO4)2 nanoplates and RuO2/NaBi(MoO4)2 composites were fabricated into gas sensors, and the gas-sensing results showed that the sensors were highly sensitive and selective to H2S, especially the sensor of 1 wt% RuO2/NaBi(MoO4)2. The sensing response of 1 wt% RuO2/NaBi(MoO4)2 sensor was 19 to 5 ppm H2S, 6.4-fold higher than that of pure NaBi(MoO4)2 sensor, the sensor also showed a fast response time of 11 s and a short recovery time of 4 s at 370 °C. Therefore, the RuO2/NaBi(MoO4)2 could be a promising candidate material for fast detection of H2S.