Structural Thermal Stability of Graphene Oxide-Doped Copper–Cobalt Oxide Coatings as a Solar Selective Surface  

作　　者：M.Mahbubur Rahman Zhong-Tao Jiang 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 

机构地区：[1]Surface Analysis and Materials Engineering, Research Group, School of Engineering & Information Technology, Murdoch University, Murdoch, Western Australia 6150, Australia [2]School of Sdence & Engineering, Teesside University, Borough Road, Middlesbrough, TSI 3BA, United Kingdom [3]Department of Physics, School of Distance Education, Universiti Sains Malaysia, Minden, 11800 Penang, Malaysia [4]Department of Chemistry, School of Chemical Sciences, Universiti Sains Malaysia, Minden, 11800 Penang, Malaysia [5]Department of Chemical Engineering, Universitas Riau, Pekanharu, Indonesia [6]School of Chemistry, Bedson Building, Newcastle University, NE1 7RU, United Kingdom [7]School of Chemistry, The University of Queensland, St. Luda, OLD 4072, Australia [8]School of Engineering & Information Technology, Murdoch University, Murdoch, Western Australia 6150, Australia

出　　处：《Journal of Materials Science & Technology》2016年第11期1179-1191,共13页材料科学技术（英文版）

基　　金：Murdoch International Postgraduate Research Scholarship(MIPRS)programme in carrying out his Ph D research;Australian Synchrotron for providing Powder Diffraction beamtime(AS141/PD/7582);supported by the Teesside University Research Fund(URF);funding support provided by IRU-MRUN Collaborative Research Program-2015

摘　　要：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.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.

关 键 词：COATINGS Sol-gel method Synchrotron radiation Fourier transform infrared spectroscopy X-ray diffraction X-ray photoelectron spectroscopy 

分 类 号：TB383.2[一般工业技术—材料科学与工程]