Abstract:

Using Fe(NO₃)₃·9H₂O as Fe source and different amino acid as surfactant, α-Fe₂O₃ samples were prepared by hydrothermal method. We used scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and Xray diffraction (XRD) to characterize the morphology of the samples, and test their gas sensing properties. The results show that the morphologies of α-Fe₂O₃ samples obtained from different surfactant are different, including solid particles and hollow microspheres (composed of particles). And the gas sensor based on hollow microsphere has good sensitive characteristic to ethanol.

Key words: hollow microsphere, α-Fe₂O₃, ethanol, hydrothermal method, gas sensor