Fang Fang, Rogers Joanne, Leveneur Jérôme, Rubanov Sergey, Koo Annette, Kennedy John
National Isotope Centre, GNS Science, 30 Gracefield Road, Lower Hutt, New Zealand.
The Macdiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand.
Nanotechnology. 2020 Dec 11;31(50):504002. doi: 10.1088/1361-6528/abb48e.
Copper oxide composites were successfully synthesized by a catalyst-free method, plasma arc technology. The as-synthesized composites were characterized by x-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, and x-ray photoelectron spectroscopy. The analysis revealed a mixture of crystalline copper oxide (CuO), cuprous oxide (CuO) and copper (Cu) phases of the copper oxide composites constitute of irregularly spheroidal particlesµ with nanoparticles aggregate on the surface. Gas pressure during plasma arc process noticeably influences the composition and solar radiative properties of the composite materials. Among the samples studied, the composites synthesized with an arc current of 80 A and a pressure of 300 Torr exhibited the highest near infrared diffuse reflectance, providing a total solar reflectance of 22.96%. The mixed phase composition together with the nanostructures among the composites are considered to contribute to the excellent near infrared reflectance of copper oxide composites. Low reflectance in the visible region combined with high reflectance in the near infrared region make this composite material a good candidate for solar reflective coating which will demonstrate black appearance but keep a cool surface under solar irradiation.
通过无催化剂方法——等离子体电弧技术成功合成了氧化铜复合材料。对合成后的复合材料进行了X射线衍射、扫描电子显微镜、透射电子显微镜、拉曼光谱和X射线光电子能谱表征。分析表明，氧化铜复合材料的晶体氧化铜（CuO）、氧化亚铜（Cu₂O）和铜（Cu）相的混合物由不规则球形颗粒组成，表面有纳米颗粒聚集。等离子体电弧过程中的气压显著影响复合材料的成分和太阳辐射特性。在所研究的样品中，以80 A的电弧电流和300 Torr的压力合成的复合材料表现出最高的近红外漫反射率，总太阳反射率为22.96%。复合材料中的混合相组成以及纳米结构被认为有助于氧化铜复合材料具有优异的近红外反射率。可见光区域的低反射率与近红外区域的高反射率相结合，使这种复合材料成为太阳能反射涂层的良好候选材料，该涂层在太阳照射下将呈现黑色外观但保持表面凉爽。
