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Structural Thermal Stability of Graphene Oxide-Doped Copper–Cobalt Oxide Coatings as a Solar Selective Surface
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作者 M.Mahbubur Rahman Zhong-Tao Jiang +9 位作者 chun-yang yin Lee Siang Chuah Hooi-Ling Lee Amun Amri Bee-Min Goh Barry J.Wood Chris Creagh Nicholas Mondinos Mohmmednoor Altarawneh Bogdan Z.Dlugogorski 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2016年第11期1179-1191,共13页
3d transition metal oxides based thin film coatings such as copper–cobalt oxides exhibit high absorption in the visible region and low emittance in the infrared to far-infrared region of the solar spectrum which is f... 3d transition metal oxides based thin film coatings such as copper–cobalt oxides exhibit high absorption in the visible region and low emittance in the infrared to far-infrared region of the solar spectrum which is favourable for use as potential selective surface materials in photothermal devices. These materials have the potential to minimize heating while increasing absorption in the operative spectrum range and therefore achieve higher solar selectivity. A series of mixed copper–cobalt metal spinel oxides(Cu_xCo_yO_z)doped with graphene oxide thin films were deposited on commercial grade aluminium substrates using a sol-gel dip-coating technique at an annealing temperature of 500 °C in air for 1 h. Characterizations of the synthesized films were carried out by high temperature synchrotron radiation X-ray Diffraction(SRXRD), UV–Vis, Fourier Transform infrared spectroscopy(FTIR) and X-ray photoelectron microscopy(XPS)techniques. High thermal stability of coatings with multiple phases, binary and ternary metal oxides, was defined through SR-XRD study. FTIR analysis shows moderate(〈80%) to high(up to 99%) reflectance in the infrared region while the UV–Vis investigations demonstrate that, in the visible region, solar absorption increases gradually(up to 95%) with the addition of graphene oxide to the Cu_x Co_y O_z coatings.With the incorporation of 1.5 wt.% of graphene oxide to the copper–cobalt oxide coatings, a high solar selectivity of 29.01(the ratio of the average solar absorptance in visible and the average thermal emittance in infrared to far infrared region; α/ε) was achieved. 展开更多
关键词 COATINGS Sol-gel method Synchrotron radiation Fourier transform infrared spectroscopy X-ray diffraction X-ray photoelectron spectroscopy
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