흑색 코발트 태양 선택흡수막의 광학적특성과 구조
Optical Properties and Structure of Black Cobalt Solar Selective Coatings
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초록
Blackcobaltsolarselectivecoatingswerepreparedbythermaloxidationofelectroplatedcobaltmetaloncopperand nickelsubstrates.Theopticalpropertiesandstructureoftheblackcobaltselectivecoatingforsolarenergyutilizations were characterized by glow discharge spectrometry (GDS), ultraviolet-visible-near infrared (UV-VIS-NIR)spectrometer,atom forcemicroscopy(AFM)andX-rayphotoelectronspectroscopy(XPS).Theopticalpropertiesof optimum blackcobaltselectivecoatingpreparedoncoppersubstratewereasolarabsorptanceof0.82andathermal emittanceof0.01.From theGDSdepthprofileanalysisofthesecoatings,theconcentrationofcobaltparticlesnear theinterfacewashigherthanatthesurface,butoxygenconcentrationatthesurfacewashigherthanattheinterface. Theseresultssuggestthattheselectiveabsorptionwasdominatedbythischemicalcompositionvariationinthe coating.Thesurfaceofthisfilm exhibitedmorphologywithroot-mean-square(rms)roughnessofabout144.3nm. XPSmeasurementsdatashowedthatseveralphasesofCocoexist(Co3O4,CoO)inthefilm.
Abstract
Blackcobaltsolarselectivecoatingswerepreparedbythermaloxidationofelectroplatedcobaltmetaloncopperand nickelsubstrates.Theopticalpropertiesandstructureoftheblackcobaltselectivecoatingforsolarenergyutilizations were characterized by glow discharge spectrometry (GDS), ultraviolet-visible-near infrared (UV-VIS-NIR)spectrometer,atom forcemicroscopy(AFM)andX-rayphotoelectronspectroscopy(XPS).Theopticalpropertiesof optimum blackcobaltselectivecoatingpreparedoncoppersubstratewereasolarabsorptanceof0.82andathermal emittanceof0.01.From theGDSdepthprofileanalysisofthesecoatings,theconcentrationofcobaltparticlesnear theinterfacewashigherthanatthesurface,butoxygenconcentrationatthesurfacewashigherthanattheinterface. Theseresultssuggestthattheselectiveabsorptionwasdominatedbythischemicalcompositionvariationinthe coating.Thesurfaceofthisfilm exhibitedmorphologywithroot-mean-square(rms)roughnessofabout144.3nm. XPSmeasurementsdatashowedthatseveralphasesofCocoexist(Co3O4,CoO)inthefilm.
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