TỔNG HỢP, ĐẶC TRƯNG VÀ TÍNH CHẤT NHẠY KHÍ CỦA Fe2O3 ĐIỀU CHẾ TỪ HẠT NANO Fe3O4

In this study, Fe3O4 nanoparticles have been prepared by co-precipitation method. The crystal structures and morphologies of as-synthesized nanoparticles were characterized X-ray diffraction, and transmission electronic microscopy. a-Fe2O3 nanoparticles were fabricated from the Fe3O4 nanoparticles by heat treatment in air atmosphere at 600 oC and their gas sensing properties were investigated. The performance of the a-Fe2O3 in the detection of toxic and flammable gases such as carbon oxide, ammonia, ethanol, and hydrogen was evaluated. The Fe2O3 based gas sensors exhibited high sensitivity and a response time of less than a minute to analytic gases