Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/130979
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Type: Journal article
Title: Enhancing forbidden light propagation in nanoporous anodic alumina gradient-index filters by alcohol additives
Author: Lim, S.Y.
Law, C.S.
Jiang, L.
Acosta, L.K.
Bachhuka, A.
Marsal, L.F.
Abell, A.D.
Santos, A.
Citation: ACS Applied Nano Materials, 2020; 3(12):12115-12129
Publisher: American Chemical Society (ACS)
Issue Date: 2020
ISSN: 2574-0970
2574-0970
Statement of
Responsibility: 
Siew Yee Lim, Cheryl Suwen Law, Lin Jiang, Laura K. Acosta, Akash Bachhuka, Lluís F. Marsal ... et al.
Abstract: A comprehensive study on structural and optical engineering of high-quality nanoporous anodic alumina gradient-index filters (NAA-GIFs) by selective addition of alcohols to the anodizing acid electrolyte is presented. Analysis of the combined effect of type (methanol, ethanol, isopropanol, and ethylene glycol) and concentration (from 10 to 70 vol %) of alcohol additives in sulfuric acid electrolytes on the optical features of the characteristic photonic stopband of NAA-GIFs—central wavelength, full width at half maximum, intensity, and quality factor—allows us to elucidate the most optimal fabrication conditions to produce high-quality NAA-GIFs by sinusoidal pulse anodization under mild conditions. Comprehensive electrochemical, structural, optical, and chemical analyses demonstrate that a suitable selection of type and concentration of the alcohol additive is critical in controlling the quality of forbidden light propagation within these photonic crystal (PC) structures. Particularly, NAA-GIFs produced by sinusoidal pulse anodization in the sulfuric acid electrolyte modified with 40 vol % methanol achieve an outstanding quality factor of ∼58 (32–54% superior than that of other alcohol additives). Our findings indicate that a combination of anodic oxide growth rate and suppressing dissolution efficiencies, mildly branched nanoporous structure, and incorporation of carbon-containing impurities into the structure of NAA-GIFs are critical factors in enhancing light-forbidding quality of these NAA-based PCs. Our results advance the understanding of structural engineering of NAA-PCs by dynamic modification of the input anodization profile under optimal electrolyte conditions.
Rights: © 2020 American Chemical Society
DOI: 10.1021/acsanm.0c02615
Grant ID: http://purl.org/au-research/grants/arc/CE140100003
http://purl.org/au-research/grants/arc/DP200102614
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Chemistry publications

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