Single-Layered Biosynthesized Copper Oxide (CuO) Nanocoatings as Solar-Selective Absorber

Herein, spectrally selective single-layered CuO nanocoatings were successfully demonstrated via green synthesis and deposited on stainless steel (SS) substrates using a spin coater at 700, 800, 900, 1000 rpm. The morphological, structural, compositional analyses of the obtained studied SEM, XRD, EDX, Raman spectroscopy. SEM images show nanorod-like structure surfaces with dense surface morphology. XRD patterns confirmed presence peaks indexed to monoclinic structural phase CuO. EDX spectra clearly revealed Cu O elements, XPS showed Cu2p O1s core levels, which are typical characteristics (II) O(II), respectively, in 305, 344, 642 cm−1 attributed active (Ag+2Bg) modes for Cu-O stretching. Rutherford backscattering spectrometry (RBS) determined content elements changes thicknesses coatings rotational speed (RS) coater. elemental atoms were, 54 46%. calculated be 1.406 × 1018 atoms/cm2 (296.3 nm), 1.286 (271.0 1.138 (239.8 0.985 1015 (207.5 nm) 900 rpm, respectively. optical properties characterized UV–Vis–NIR FTIR spectrometers; its vital solar selectivity parameters absorptance (α) emissivity (ε) evaluated ranges 0.3–2.5 2.5–20 µm wavelengths, exhibited (α = 0.90, ε 0.31) associated 700 rpm due an intrinsic interference-induced absorption as well higher attenuation light.