Hydrogen Sulfide Gas Sensor Based on a V2O3/NiO Composite

Abstract

Hydrogen sulfide（H2S）is a colorless and odorous gas. Abnormal H2S concentration may be related to Alzheimer's disease, ischemia, Down syndrome, bad breath and other diseases. Therefore, rapid、sensitive and highly selective detection of H2S is essential for the early diagnosis of these diseases. In the research, a two-dimensional nanosheet self-assembly structure based on NiO-V2O3 was developed to construct a high-performance H2S gas sensor. Morphological and structural characterization proved that the NiO-V2O3 composite is a three-dimensional flower-like porous microspheres self-assembled from two-dimensional nanosheets with high surface area and rich active sites. The sensor can quantitatively detect H2S gas at ppb level. When exposed to 500 ppb H2S gas at the optimal working temperature of 200°C, the highest response of the sensor is 65, and the response time and recovery time are 8 s and 25 s, respectively. The sensor also has excellent stability, moisture resistance and selectivity, and has a low detection limit (20 ppb). Considering these advantages, the NiO-V2O3 sensor is expected to be used for the detection of H2S in the early diagnosis of certain diseases. Figure 1