Conductometric NO2 gas sensor based on Co-incorporated MoS2 nanosheets for room temperature applications

Room temperature rapid detection of toxic gases is still ambitious for real-time application. Recently, molybdenum disulfide transition dichalcogenides (MoS2 TMDCs) have been considered as a promising material for gas sensing application, owing to their high surface-to-volume ratio. However low response and incomplete recovery hinder their performance. In this work, we demonstrate MoS2 and cobalt incorporated MoS2 to enhance the sensing response and rapid recovery. Co-incorporated (7 at%) MoS2 showed 546.6% enhancement in response compared to pristine MoS2 for 100 ppm of NO2 gas at room temperature. The enhanced edge site presents in the Co-incorporated samples was the reason for excellent gas adsorption and increased response towards NO2 gas molecules. The stability analysis showed 70% of stability of a fabricated device. These results address a new pathway for an ideal gas sensor for room temperature application.

Automated summary

In this study, MoS2 and cobalt incorporated MoS2 were demonstrated to enhance the sensing response and rapid recovery for toxic gas detection at room temperature. The Co-incorporated (7 at%) MoS2 showed a 546.6% enhancement in response compared to pristine MoS2 for 100 ppm of NO2 gas. The presence of enhanced edge site in the Co-incorporated samples contributed to excellent gas adsorption and increased response towards NO2 gas molecules. The fabricated device exhibited 70% stability.