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dc.contributor.authorLim, S.-
dc.contributor.authorLaw, C.-
dc.contributor.authorMarkovic, M.-
dc.contributor.authorKirby, J.-
dc.contributor.authorAbell, A.-
dc.contributor.authorSantos, A.-
dc.identifier.citationACS Applied Materials and Interfaces, 2018; 10(28):24124-24136-
dc.descriptionPublished: June 25, 2018-
dc.description.abstractIn this study, we explore for the first time the capabilities of nanoporous anodic alumina gradient-index filters (NAA-GIFs) functionalized with titanium dioxide (TiO₂) photoactive layers to enhance photon-to-electron conversion rates and improve the efficiency of photocatalytic reactions by “slow photon” effect. A set of NAA-GIFs was fabricated by sinusoidal pulse anodization, in which a systematic modification of various anodization parameters (i.e., pore widening time, anodization period, and anodization time) enables the fine-tuning of the photonic stopband (PSB) of these nanoporous photonic crystals (PCs) across the spectral regions. The surface of NAA-GIFs was chemically modified with photoactive layers of TiO₂ to create a composite photoactive material with precisely engineered optical properties. The photocatalytic performance of TiO₂-functionalized NAA-GIFs was assessed by studying the photodegradation of three model organic dyes (i.e., methyl orange, Rhodamine B, and methylene blue) with well-defined absorption bands across different spectral regions under simulated irradiation conditions. Our study demonstrates that when the edges of characteristic PSB of TiO₂-modified NAA-GIFs are completely or partially aligned with the absorption band of the organic dyes, the photodegradation rate is enhanced due to “slow photon” effect. A rational design of the photocatalyst material with respect to the organic dye is demonstrated to be optimal to speed up photocatalytic reactions by an efficient management of photons from high-irradiance spectral regions. This provides new opportunities to develop high-performing photocatalytic materials for efficient photocatalysis with broad applicability.-
dc.description.statementofresponsibilitySiew Yee Lim, Cheryl Suwen Law, Marijana Markovic, Jason K. Kirby, Andrew D. Abell, and Abel Santos-
dc.publisherAmerican Chemical Society-
dc.rights© 2018 American Chemical Society-
dc.subjectNanoporous anodic alumina; photonic crystals; slow photon effect; surface-modification; photocatalysis-
dc.titleEngineering the slow photon effect in photoactive nanoporous anodic alumina gradient-index filters for photocatalysis-
dc.typeJournal article-
dc.identifier.orcidLim, S. [0000-0002-5677-9039]-
dc.identifier.orcidLaw, C. [0000-0002-3276-8052]-
dc.identifier.orcidMarkovic, M. [0000-0003-0040-6249]-
dc.identifier.orcidAbell, A. [0000-0002-0604-2629]-
dc.identifier.orcidSantos, A. [0000-0002-5081-5684]-
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