Synthesis, Characterization and Gas Sensing Properties of Ag-doped α-Fe2O3 by Solid-state Grinding Method
Ag-doped α-Fe2O3 nanoparticles were synthesized by the solid-state grinding method, and
the as-prepared samples were characterized by X-ray powder diffraction (XRD), transmission electron
microscopy (TEM), thermogravimetry-differential thermal analysis (TG-DTA), and X-ray photoelectron
spectroscopy (XPS) techniques. The analysis results indicated that all the particles were of spherical
morphology and their size was about 10 nm. The gas sensing properties of the sensors based on the
as-prepared Ag/Fe2O3 nanoparticles to different gas were investigated in detail. Compared the gas sensing test results of
the Ag-doped α-Fe2O3 with the -Fe2O3 without doped, all of the sensors based on the Ag-doped α-Fe2O3 nanoparticles
possess much better sensing behavior than that of pure α-Fe2O3. The sensor based on the 300 °C-calcined 3%-Ag/Fe2O3
materials displayed the maximum response to H2S at 150 °C, and to ethanol at 245 °C. This solid-state grinding method
prepared Ag/α-Fe2O3 nanomaterials are promising candidate for low temperature H2S detection.
Keywords: Ag-doped α-Fe2O3, ethanol, gas sensor, H2S, solid-state grinding method, synthesis.
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