Abstract
In this communication, Ag/Fe2O3 nanocomposites were successfully synthesized by reduction of silver nitrate with NaBH4 and subsequent coating of Fe2O3 by a simple Pechini sol-gel method. Synthesized powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Gas sensing properties of Ag/Fe2O3 nanocomposites and pristine Fe2O3 were studied at different temperature and in the presence of different gases. It was found that Ag/Fe2O3 sensor even can detect 500 ppb NO2 gas at 150°C, whereas pristine Fe2O3 sensor showed no significant response to NO2. The possible mechanisms of NO2 sensing by Ag/Fe2O3 are discussed in detail.
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