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Engineering the Slow Photon Effect in Photoactive Nanoporous Anodic Alumina Gradient-Index Filters for Photocatalysis. | LitMetric

AI Article Synopsis

  • This study investigates the use of nanoporous anodic alumina gradient-index filters (NAA-GIFs) with titanium dioxide (TiO) layers to improve photon-to-electron conversion rates and enhance photocatalytic reactions through a phenomenon called the "slow photon" effect.
  • The authors created a set of NAA-GIFs by adjusting anodization parameters to refine their optical properties and better align with the absorption bands of specific organic dyes used in photocatalytic tests.
  • Results show that when the photonic stopband of the TiO-modified NAA-GIFs aligns with the absorption bands of the organic dyes, the degradation rate of these dyes increases, suggesting a pathway for optimizing photocatalytic materials for

Article Abstract

In this study, we explore for the first time the capabilities of nanoporous anodic alumina gradient-index filters (NAA-GIFs) functionalized with titanium dioxide (TiO) 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 TiO to create a composite photoactive material with precisely engineered optical properties. The photocatalytic performance of TiO-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 TiO-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.

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Source
http://dx.doi.org/10.1021/acsami.8b05946DOI Listing

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