Abstract
As a typical n-type semiconductor, MoO3 has been widely applied in the gas-detection field due to its competitive physicochemical properties and ecofriendly characteristics. Volatile organic compounds (VOCs) are harmful to the atmospheric environment and human life, so it is necessary to quickly identify the presence of VOCs in the air. This review briefly introduced the application progress of an MoO3-based sensor in VOCs detection. We mainly emphasized the optimization strategies of a high performance MoO3, which consists of morphology-controlled synthesis and electronic properties functional modification. Besides the general synthesis methods, its gas-sensing properties and mechanism were briefly discussed. In conclusion, the application status of MoO3 in gas-sensing and the challenges still to be solved were summarized.
Highlights
Volatile organic compounds (VOCs) mainly come from the exhaust gases generated by fuel combustion and transportation, as well as emissions from building materials, decorative materials, and furniture
Y. et al, 2018; Zhou et al, 2018c, 2019; Wang et al, 2019a; Wei et al, 2020), so it is reasonable to propose the employment of a gas sensor to realize the online monitoring of VOCs
Zhu et al (2019) synthesized hollow MoO3 microcages by a facile one-step hydrothermal process, which had gone through four steps of heating, cooling, centrifugation, and washing
Summary
Volatile organic compounds (VOCs) mainly come from the exhaust gases generated by fuel combustion and transportation, as well as emissions from building materials, decorative materials, and furniture. There are two common techniques—photo ionization detector (PID) and flame ionization detector (FID)—to detect VOCs, the application of these methods in industry are limited due to the relatively high cost and complicated maintenance. Considering the characteristics of small size, low cost, and convenient fabrication, semiconductor gas sensor technology plays an important role in many fields Y. et al, 2018; Zhou et al, 2018c, 2019; Wang et al, 2019a; Wei et al, 2020), so it is reasonable to propose the employment of a gas sensor to realize the online monitoring of VOCs
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