ZIF-67 MOF derived in-doped Co3O4 nanoflowers for H2S gas-sensing performances

Hydrogen sulfide (H2S) is a colorless toxic acidic gas, so the development of gas sensors that can effectively detect H2S in the environment is critical to protecting human health. Metal-organic frameworks (MOFs) are emerging as promising template for semiconductor materials in gas sensor technology, offering unique structural advantages for various sensing applications. This study aimed to understand the properties of Indium-doped ZIF67 nanoflowers by analyzing their crystal structure, surface morphology, and chemical composition. It also investigated the hydrogen sulfide (H2S) gas-sensitive properties of these materials to fully comprehend their capabilities and limitations. It is demonstrated that the Co3O4 sensor doped with 5 % In displays excellent stability, gas selectivity, and responsiveness. Specifically, the Co3O4 sensor doped with 5 % In showed a response of 19-50 ppm H2S at an operating temperature of 180 degrees C, which was significantly higher than that of the pure Co3O4 sensor. This is mainly due to the high content of oxygen vacancy (11.26 %). In the 5 % In doped sample, and the relatively large specific surface area (60.58 m2g-1).