Hydrothermal synthesis and ethanol-sensing properties of α-Fe2O3 hollow nanospindles

• Published in: Materials science in semiconductor processing Vol. 107; p. 104861
• Main Authors: Vuong, Dang Duc, Phuoc, Luong Huu, Hien, Vu Xuan, Chien, Nguyen Duc
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2020
• Subjects: Gas sensor; Hydrothermal synthesis; Iron oxides; Porous/hollow structure; Gas sensor; Hydrothermal synthesis; Iron oxides; Porous/hollow structure
• ISSN: 1369-8001; 1873-4081
• DOI: 10.1016/j.mssp.2019.104861

Iron oxide nanostructures have been studied extensively because of their magnetic, optical, electrical, and catalytic properties. In this work, uniform α-Fe2O3 hollow nanospindles were synthesized through hydrothermal method. The average length and outer diameters of the nanospindles are 300 sand 100 nm, respectively. The hollow spindles’ dimensions can be tailored by varying the treatment duration. A growth mechanism of the α-Fe2O3 hollow nanospindle is discussed. Furthermore, the ethanol-sensing properties of the as-synthesized material are investigated at different gas concentrations (25–300 ppm) and operating temperatures (200–400 °C). The sensing output indicates that the α-Fe2O3 hollow nanospindles are an excellent ethanol-sensing material, which can be developed further for practical application. α-Fe2O3 hollow nanospindles with outer diameters of 70–120 nm and lengths of 120–400 nm were synthesized. The average length of the α-Fe2O3 hollow nanospindles was reduced when the treatment was prolonged from 24 h to 48 h. The hollow nanospindles were sensitive to C2H5OH at a minimum concentration of 25 ppm. [Display omitted]