MICROSTRUCTURAL CHARACTERIZATION OF Au-DOPED IRON OXIDE FOR CO GAS SENSORS

摘要

A detailed characterization by XRD, SEM, TEM, Mossbauer and XPS of a series of Au-doped iron oxide with different gold loading is reported. It has shown that the morphology and microstructure of samples containing Au is different from that of the undoped oxide. The formation of iron oxide amorphous phases is favored at higher gold loading. Au was found to be distributed in the structure of the semiconductor oxide mainly in an oxidized state, irrespectively of the metal loading.On the basis of the reported results, the role of Au in modifying the microstructure of the doped materials and its effect on the CO sensing at low temperature are discussed.