Sensing Properties of NiO@SnO2 Based Sensor to Hydrogen Extracted from Transformer Oil

A novel NiO@SnO2 chemical gas sensor was proposed to detect hydrogen H-2 gas extracted from transformer oil. NiO@SnO2 nanostructures were synthesized via an environment-friendly hydrothermal method and planar chemical gas sensors based on the synthesized samples were fabricated. Sensing performances of the fabricated NiO@SnO2 chemical gas sensors to H-2 were performed on a CGS-1TP intelligent gas sensing analysis system. Compared with pure SnO2 sensor, superior H-2 sensing properties with the proposed NiO@SnO2 chemical gas sensor were measured, which could be ascribed to the formation of p-n hetero-junctions between p-type NiO and n-type SnO2 sensing materials. Furthermore, the prepared NiO@SnO2 chemical gas sensor exhibits a quasi-linear relationship to H-2 gas with concentration ranging 1-50 mu L/L. These results demonstrate that the proposed NiO@SnO2 chemical gas sensor a promising candidate for recognition and analysis of H-2 gas extracted from transformer oil.