Copper oxide (CuO) nanostructures were synthesized through a simple and low-cost wet chemical method using copper nitrate trihydrate as precursor and sodium hydroxide (NaOH) as stabilizing agent. Scanning electron microscopy analysis revealed formation of diverse CuO nanostructures as a consequence of varying the concentration of NaOH in the reaction medium. X-ray diffraction examination disclosed existence of end-centered monoclinic structured CuO as evident from the diffraction peaks observed at 2θ values corresponding to diffraction planes. Existence of cubic phase Cu₂O was confirmed by presence of diffraction peak at 2θ value of 61.5°, corresponding to [0 2 2] diffraction plane. Energy-dispersive X-ray spectroscopy analysis proved pristine nature of the CuO nanostructures. UV-Vis-NIR reflectance value of CuO nanostructures prepared using different concentrations of NaOH exhibited reliable solar absorptance values, which were in accordance with their respective reflectance values. Among them, the CuO nanostructure prepared using NaOH concentration of 1.0 M disclosed high solar absorptance and selectivity values of 0.80 and 18.60, respectively.

以三水合硝酸铜为前驱体，以氢氧化钠 (NaOH) 为稳定剂，通过简单且低成本的湿化学法合成了氧化铜 (CuO) 纳米结构。扫描电子显微镜分析表明，由于反应介质中 NaOH 浓度的变化，形成了不同的 CuO 纳米结构。X 射线衍射检查揭示了端心单斜结构 CuO 的存在，这从在对应于衍射平面的 2θ 值处观察到的衍射峰是显而易见的。立方相Cu _{2 的}存在通过在 61.5° 的 2θ 值处存在衍射峰证实了 O，对应于 [0 2 2] 衍射平面。能量色散 X 射线光谱分析证明了 CuO 纳米结构的原始性质。使用不同浓度 NaOH 制备的 CuO 纳米结构的 UV-Vis-NIR 反射值表现出可靠的太阳能吸收值，这与它们各自的反射值一致。其中，使用 1.0 M NaOH 浓度制备的 CuO 纳米结构的太阳能吸收率和选择性值分别为 0.80 和 18.60。