Sensing properties of NiO@SnO2 based sensor to hydrogen extracted from transformer oil

Abstract

A novel NiO@SnO 2 chemical gas sensor was proposed to detect hydrogen H 2 gas extracted from transformer oil. NiO@SnO 2 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@SnO 2 chemical gas sensors to H 2 were performed on a CGS-1TP intelligent gas sensing analysis system. Compared with pure SnO 2 sensor, superior H 2 sensing properties with the proposed NiO@SnO 2 chemical gas sensor were measured, which could be ascribed to the formation of p-n hetero-junctions between p-type NiO and ntype SnO 2 sensing materials. Furthermore, the prepared NiO@SnO 2 chemical gas sensor exhibits a quasi-linear relationship to H 2 gas with concentration ranging 1–50 μL/L These results demonstrate that the proposed NiO@SnO 2 chemical gas sensor a promising candidate for recognition and analysis of H 2 gas extracted from transformer oil.