Hydrothermal synthesis of monodisperse α-Fe2O3 hollow microspheroids and their high gas-sensing properties

作者：Zeng, Q. Z.; Ma, S. Y.^*; Jin, W. X.; Yang, H. M.; Chen, H.; Ge, Q.; Ma, L.

来源：Journal of Alloys and Compounds, 2017, 705: 427-437.

DOI：10.1016/j.jallcom.2017.01.268

• Gas sensors
• Monodisperse
• Y-doped alpha-Fe2O3
• Hydrothermal
• Hollow structure

Y-doped alpha-Fe2O3 hollow microspheroids were synthesized by one-pot hydrothermal reaction and subsequent annealing at 550 degrees C for 4 h. The as-synthesized alpha-Fe2O3 hollow microparticles were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) and gas-sensing measurement device, and the results showed that the diameters of all these microparticles were around 1.6-2.3 mm. In order to demonstrate the potential application, gas sensors based on as-synthesized monodisperse alpha-Fe2O3 hollow microspheroids were fabricated. The gas sensing results showed that the response value of 4 wt% Y-doped alpha-Fe2O3 hollow microspheroids sensor to 200 ppm ethanol was 126.3 at the optimum operating temperature of 260 degrees C. Finally, the possible formation mechanism of alpha-Fe2O3 hollow microspheroids and the gas-sensing mechanism of sensors were proposed, too.

• 出版日期2017-5-25
• 单位西北师范大学