Abstract
A rapid synthesis method of Cu2Y2O5 micropowders, which takes around 10 min, is reported for the first time. This fast procedure, achieved by combining a nitrate/glycerol auto-combustion and an annealing step, constitutes an important improvement over the conventional solid-state reaction methods, which usually require several hours. The analysis of products was performed using X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, scanning transmission electron microscopy, Fourier transform Raman spectroscopy and diffuse reflectance spectroscopy. The optical band gap of Cu2Y2O5, estimated using the Tauc plot, was found to be 2.58 eV. The high-temperature X-ray diffraction study, which was performed in a vacuum, confirmed the conversion of the Cu2Y2O5 phase to a mixture of CuYO2 delafossite and Y2O3. Thus, the overall time for obtaining CuYO2, which is a well-known transparent conducting oxide (TCO), can be reduced to under 1 h.
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