Silica-Copper Oxide Composite Thin Films as Solar Selective Coatings Prepared by Dipping Sol Gel

Figure 3

XPS spectra of samples deposited on SS at 1, 3, and 5 dipping cycles (labeled as 1i, 3i, and 5i), using a sol at $Si/Cu=1$: (a) O 1s core level XPS spectra, (b) Cu 2p core level XPS spectra, and (c) Si 2p core level XPS spectra. For comparison, Figure 3(a) displays the XPS standards of SiO₂ (top panel) and CuO (bottom panel).