Convenient route for synthesis of alpha-Fe2O3 and sensors for H2S gas

• Published in: Journal of alloys and compounds Vol. 774; pp. 1181 - 1188
• Main Authors: Zhang, Hai-Jun, Meng, Fan-Na, Liu, Li-Zhu, Chen, Yu-Jin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.02.2019
• Subjects: H2S sensing characteristics; Nanostructures; Solvothermal method; α-Fe2O3 nanosheet; α-Fe2O3 nanosheet; Nanostructures; Solvothermal method; H2S sensing characteristics
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.09.384

Α-Fe2O3 nanosheets were synthesized through solvothermal method and characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer–Emmett–Teller specific surface area analysis (BET) techniques. It was found that the reaction temperature plays a very important role in the composition, the size and morphology at reaction temperature ranging from 100 to 160 °C. Obtained results indicated that α-Fe2O3 nanosheets with size of 200 nm diameter and 50 nm thickness were prepared at 150 °C. To demonstrate the use of α-Fe2O3 nanosheets materials, a chemical gas sensor has been fabricated and investigated. The special structural characteristic of α-Fe2O3 nanosheet resulted in its excellent H2S sensing properties including high sensor response, low detection limit, low working temperature and good selectivity. [Display omitted] •α-Fe2O3 nanosheets were synthesized by a convenient route.•The products were affected at reaction temperature ranging from 90 to 160 °C.•α-Fe2O3 nanosheets sensors can detect H2S gas down to 1 ppm.•The gas sensing mechanism of the nanostructures is discussed.•This methodology should be useful for preparing other nanostructured materials.