MoO2 Nanospheres Synthesized by Microwave-Assisted Solvothermal Method for the Detection of H2S in Wide Concentration Range at Low Temperature

It is crucial to develop highly energy-efficient and selective sensors for wide concentration range of H 2 S, a common toxic gas that widely exists in petrochemical industries. In this work, MoO 2 nanospheres were rapidly synthesized by microwave-assisted solvothermal method, and were subsequently fabricated into H 2 S gas sensor. The MoO 2 nanospheres-based sensor exhibited excellent response toward H 2 S with good linearity in a wide concentration range (10–240 ppm). Besides, this sensor presented low working temperature, good repeatability, and selectivity against CH 4 , H 2 , and CO. The outstanding sensing performance results from the reaction between H 2 S and abundant chemisorbed oxygen introduced by oxygen vacancies of MoO 2 . This result indicates that MoO 2 nanosphere synthesized by microwave-assisted solvothermal method is a promising sensing material for H 2 S detection.