Hydrogen sulfide gas sensing properties of metal organic framework-derived α-Fe2O3 hollow nanospheres decorated with MoSe2 nanoflowers

• Published in: Sensors and actuators. B, Chemical Vol. 344; p. 130221
• Main Authors: Pan, Wenjing, Zhang, Yong, Yu, Sujing, Liu, Xiaohua, Zhang, Dongzhi
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.10.2021; Elsevier Science Ltd
• Subjects: Alpha iron; Ferric oxide; Gas sensors; Gases; H2S gas sensing; Heterojunction; Heterojunctions; Hydrogen sulfide; Iron oxides; Metal-organic frameworks; Molybdenum compounds; Nanocomposites; Nanospheres; Room temperature; Selectivity; α-Fe2O3/MoSe2 nanocomposite; H2S gas sensing; α-Fe2O3/MoSe2 nanocomposite; Metal-organic frameworks; Heterojunction
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2021.130221

•The MOF-derived α-Fe2O3/MoSe2 sensor was fabricated by hydrothermal and screen-printing technology.•The α-Fe2O3/MoSe2 composite sensor exhibited excellent sensing properties toward H2S sensing.•The improved H2S sensing properties was due to the heterojunctions formed between α-Fe2O3 and MoSe2. The metal-organic framework (MOF)-derived alpha-iron oxide hollow nanosphere/molybdenum diselenide nanoflower (α-Fe2O3/MoSe2) composite is fabricated via simple hydrothermal route. Multiple characterization methods have proved the successful synthesis of α-Fe2O3/MoSe2 composites. The nanocomposite with a mass ratio of α-Fe2O3 and MoSe2 of 4:1 shows high response to H2S gas sensing. Moreover, the gas sensitivity test of the system shows that the α-Fe2O3/MoSe2 composite sensor exhibits a faster response/recovery rate, outstanding repeatability and anti-humidity interference toward H2S sensing at room temperature, which also shows excellent selectivity for H2S compared to various potentially interfering gases. Further studies have shown that α-Fe2O3/MoSe2 nanocomposites have improved H2S gas sensing performance due to the increased active sites and specific surface area, and the formation of n-n heterojunctions at the interface between α-Fe2O3 hollow nanospheres and MoSe2 nanoflowers.