Gas Sensing Properties of Zn-Doped Anisometric Fe2O3 Nanoparticles
T. Kim, A.C. Sharp, H. Yim, B. Guo
Texas A&M University, College Station, US
Keywords: flame spray pyrolysis, gas sensing, signal, aging, sensitivity
Abstract:Gas sensing is an important function in safety, security, energy conversion and many other applications. Doped Fe2O3 particles have been investigated as a sensor material to detect combustible and toxic gases. These particles may prove more economic than the traditional SnO2 material, with comparable or even superior performance. However, gas sensing capability and stability of doped- Fe2O3 particles are yet to be fully investigated. In this study, we used a flame aerosol method to generate Zn-doped Fe2O3 nanoparticles and microparticles. The nanoparticles showed a gas sensing sensitivity to acetone that was 20 times the literature value. In addition, the nanoparticles showed much better aging resistance than the microparticles. The flame synthesized particles showed aniosometric characteristics, which may explain the high gas sensitivity and the resistance to aging.