Composition control and selective infrared radiative properties of copper alloy oxides by DC reactive sputtering

Abstract

In order to identify new selective infrared radiative materials, Cu80Ni15Ag5 and Cu70Ni25Ag5 oxides were prepared by DC reactive magnetron sputtering under atmosphere with different ratio of argon to oxygen. The composition of the copper alloy oxides was analyzed by XRD, XPS and Raman. When the ratio of argon to oxygen was 50:2, the alloy oxide is amorphous, whereas the alloy oxide prepared at the ratio of argon to oxygen from 50:4 to 50:10 is Cu4O3. The doping of Ni and Ag may impede CuO phase formation, deteriorate the crystallinity, and increase the defects. The emissivity measurement results show that Cu70Ni25Ag5 oxides prepared at the ratio of argon to oxygen of 50:10 have good selective infrared radiative properties, and the emissivity difference is more than 0.8 between 3μm band and 8-14μm band.