Gas Sensing Properties of Zn-Doped Anisometric Fe2O3 Nanoparticles

摘要

In this study, we synthesized nanocrystalline Zn-doped γ-Fe2O3by flame spray pyrolysis under different conditions, and then investigated the gas sensing characteristics of these particles. Transmission electron microscopy (TEM) was employed to characterize the particles. Gas sensors were fabricated by applying the as-synthesized particles on interdigitated electrodes. The response of the gas sensor to acetone vapor in dry synthetic air was measured before and after 3 days of aging. High-temperature flame (H2/O2 diffusion) generated nanometer-sized particles; lower temperature flame (H2/Air diffusion) generated micrometer- sized particles. The Zn-doped Fe2O3 nanoparticles showed a gas sensing sensitivity that was 20 times the literature value.[1]The 3Cday aging did not cause deterioration in gas sensing ability of the Zn-doped Fe2O3 nanoparticles. However, the microparticles lost their gas sensing ability after aging. The results showed that the flame synthesized γ-Fe2O3 particles had high gas sensing signal, and ere more resistant toward aging than the microparticles.