AUTHOR=An Fei , Mu Shanjun , Zhang Shucai , Xu Wei , Li Na , Wang Haozhi , Wang Shiqiang , Zhao Chenyang , Feng Junjie , Wang Lin , Sun Bing 

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

JOURNAL=Frontiers in Materials

VOLUME=8

YEAR=2021

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2021.670044

DOI=10.3389/fmats.2021.670044

ISSN=2296-8016

ABSTRACT=<p>It is crucial to develop highly energy-efficient and selective sensors for wide concentration range of H<sub>2</sub>S, a common toxic gas that widely exists in petrochemical industries. In this work, MoO<sub>2</sub> nanospheres were rapidly synthesized by microwave-assisted solvothermal method, and were subsequently fabricated into H<sub>2</sub>S gas sensor. The MoO<sub>2</sub> nanospheres-based sensor exhibited excellent response toward H<sub>2</sub>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<sub>4</sub>, H<sub>2</sub>, and CO. The outstanding sensing performance results from the reaction between H<sub>2</sub>S and abundant chemisorbed oxygen introduced by oxygen vacancies of MoO<sub>2</sub>. This result indicates that MoO<sub>2</sub> nanosphere synthesized by microwave-assisted solvothermal method is a promising sensing material for H<sub>2</sub>S detection.</p>