Copper Acetate Manufacturers(WSDTY) proposed CuYO2 thin films were prepared on SiO2 substrates by the sol-gel method. Prior to deposition of the thin films, the substrates were degreased by ultrasonication in EtOH. Copper (II) acetate monohydrate was dissolved in a mixture of 2-methoxyethanol and 2-aminoethanol by stirring for 12 h at room temperature. The molar ratio of 2-aminoethanol, chelating agent, to copper acetate was maintained at 4:1 and the color of the solution was dark blue. Yttrium acetate tetrahydrate (Wako Chemicals) was dissolved in a mixture of 2-me- thoxyethanol and 2-aminoethanol by stirring for 12 h at room temperature. The molar ratio of 2-aminoethanol to aluminum acetate basic was maintained at 2:1. After stirring, a colorless homogeneous solution was obtained. The two solutions were mixed with a Cu/Y ratio of 1:1 and stirred at room temperature for 12 h to form a sol. The sol was with total metal ion concentrations of 0.40 M. The sol was spin-coated onto a SiO2 substrate with spinning speed of 3000 rpm for 5 s. In the case of the samples prepared for transmission spectroscopy measurements, the sol adsorbed on the back side of the substrate was carefully removed after spin-coating.
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