Spectral emissivity and thermal conductivity properties of black aluminum films

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dc.contributor.authorMore-Chevalier, Joris
dc.contributor.authorMartan, Jiří
dc.contributor.authorRepän, Taavi
dc.contributor.authorDuprey, Sylvain
dc.contributor.authorHruška, Petr
dc.contributor.authorNovotný, Michal
dc.contributor.authorHonnerová, Petra
dc.contributor.authorKejzlar, Jan
dc.contributor.authorLabbé, Christophe
dc.contributor.authorPoupon, Morgane
dc.contributor.authorDejan, Prokop
dc.contributor.authorNikitin, Daniil
dc.contributor.authorPortier, Xavier
dc.contributor.authorFitl, Přemysl
dc.contributor.authorCardin, Julien
dc.contributor.authorJaaniso, Raivo
dc.contributor.authorLančok, Ján
dc.date.accessioned2025-05-19T20:06:35Z
dc.date.available2025-05-19T20:06:35Z
dc.date.issued2025
dc.description.abstract-translatedBlack aluminum is a material characterized by high surface porosity due to columnar growth and exhibits unique optical properties that make it attractive for applications such as light trapping, infrared detection, and passive thermal radiation cooling. In this study, we correlate the structural and optical properties of black aluminum by comparing it with conventional reflective aluminum layers. These layers of varying thicknesses were deposited on fused silica substrates, and their optical properties were analyzed. COMSOL simulations, supported by experimental data, reveal that black aluminum's structure leads to a significant reduction in visible light reflectivity and an increase in emissivity in the near- and mid-infrared ranges. This enhanced emissivity is partly due to the presence of aluminum nitride (AlN) grain boundaries and an oxidized surface layer. Optically, black aluminum differs significantly from reflective aluminum by presenting a reflectivity below 5% in visible wavelength and an average emissivity of approximately 0.4-0.5 from 1.2 to 20 mu m. Thermally, it possesses approximately ten times lower thermal conductivity and doubles the volumetric heat capacity. These differences are attributed to its porous structure, nanoscale crystallites, and the presence of aluminum nitrides and oxides within the material.en
dc.description.sponsorshipEH22_008/0004596 Senzory a detektory pro informační společnost budoucnosti, EH22_008/0004634 Strojní inženýrství biologických a bioinspirovaných systémůcs
dc.format11 s.cs
dc.identifier.doihttps://doi.org/10.1021/acs.langmuir.4c03838
dc.identifier.urihttp://hdl.handle.net/11025/59182
dc.language.isoenen
dc.publisherAmerican Chemical Societyen
dc.rights© CC BY 4.0en
dc.rights.accessopenAccessen
dc.subjectoptické vlastnostics
dc.subjectnanoskopická poréznostcs
dc.subjectodpadní teplocs
dc.subjecttenké filmycs
dc.subjectodrazivostcs
dc.subjectnátěrycs
dc.subjectpovrchcs
dc.subjectvrstvycs
dc.subjectsílacs
dc.subjectmikrostrukturacs
dc.subject.translatedoptical-propertiesen
dc.subject.translatednanoscopic porosityen
dc.subject.translatedwaste heaten
dc.subject.translatedthin-filmsen
dc.subject.translatedreflectanceen
dc.subject.translatedcoatingsen
dc.subject.translatedsurfaceen
dc.subject.translatedlayersen
dc.subject.translatedpoweren
dc.subject.translatedmicrostructureen
dc.titleSpectral emissivity and thermal conductivity properties of black aluminum filmsen
dc.typearticleen
dc.typečlánekcs
dc.type.statusPeer revieweden
dc.type.versionpublishedVersionen
local.files.count1*
local.files.size10190903*
local.has.filesyes*

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