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A Strategy towards Light-Absorbing Coatings Based on Optically Black Nanoporous Alumina with Tailored Disorder

Pashchanka, Mikhail ; Cherkashinin, Gennady (2022):
A Strategy towards Light-Absorbing Coatings Based on Optically Black Nanoporous Alumina with Tailored Disorder. (Publisher's Version)
In: Materials, 14 (19), MDPI, e-ISSN 1996-1944,
DOI: 10.26083/tuprints-00019973,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: A Strategy towards Light-Absorbing Coatings Based on Optically Black Nanoporous Alumina with Tailored Disorder
Language: English
Abstract:

This work provides a conceptually new way of thinking about the light-absorbing mechanism in additive-free black porous anodic alumina (black PAA, or b-PAA) layers obtained via “burning” anodizing regime. The new insight into the controllable photonic effects in PAA allows the implementation of the optical blackening method based on the deliberate randomization of the initially well-ordered nanopore arrangement. The proposed black coloration mechanism rests solely on the destructive interference of light after its multiple scattering. Similar effects have been earlier considered for some natural or artificially created biomimetic structures (e.g., the so-called “moth eye effect”, or the coloration mechanism in the Neurothemis tullia dragonfly wings). Comprehensive analysis confirmed that the chemical composition of b-PAA has only a minor influence on the color changes and the optical density increase, and that the light-absorbing properties most likely result from the structural effects. The new functional 2D materials exhibit strong adhesion to aluminum surface, are cost-effective and suitable for application under harsh thermal or UV-light conditions. They are potentially useful for manufacturing of optical devices or heat-resistant coatings in aerospace technologies, as well as solid supports for biological filtration and fluorescence imaging.

Journal or Publication Title: Materials
Volume of the journal: 14
Issue Number: 19
Publisher: MDPI
Collation: 19 Seiten
Uncontrolled Keywords: order–disorder phenomena, anodizing, X-ray photoelectron spectroscopy (XPS), nanostructured materials, photonic light entrapping
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
500 Naturwissenschaften und Mathematik > 540 Chemie
Divisions: 11 Department of Materials and Earth Sciences > Material Science
07 Department of Chemistry > Fachgebiet Anorganische Chemie
Date Deposited: 02 May 2022 11:29
Last Modified: 02 May 2022 11:29
DOI: 10.26083/tuprints-00019973
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-199734
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19973
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