Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 52: Functional semiconductors for renewable energy solutions II (joint session HL/CPP)

CPP 52.4: Vortrag

Dienstag, 17. März 2020, 14:45–15:00, POT 151

Photocatalytic performance of ALD-functionalized Nanoporous Anodic Alumina Photonic Crystals — •Carina Hedrich1, Siew Yee Lim2, Abel Santos2, Robert H. Blick1, and Robert Zierold11Center for Hybrid Nanostructures (CHyN), Universität Hamburg, 22761 Hamburg, Germany — 2School of Chemical Engineering and Advanced Materials / Institute for Photonics and Advanced Sensing (IPAS) / ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP), The University of Adelaide, South Australia 5005, Australia

Nanoporous anodic alumina (NAA) membranes feature self-organized, highly ordered pores with distinct geometrical characteristics. Modifying the electrochemical anodization parameters and applying pulse-like anodization profiles tailors the pore morphology from straight to modulated structures such as distributed Bragg reflectors or gradient index filters. The photocatalytic performances of these photonic crystals (PCs) can be enhanced by functionalizing the surface with photocatalytically active materials (e.g. TiO2, ZnO, WO3) or tuning the photonic stopband of the NAA by adapting the pore morphology. Herein, thickness-controlled surface modifications of NAA-PCs by atomic layer deposition (ALD) are conducted and the photocatalytic properties of these structures are investigated by studying the photodegradation of methylene blue. Optimizing and combining these different preparation strategies to further improve the photocatalytic efficiency and to tune the wavelength selectivity of NAA-PCs could expand their utilization as tailor-made photocatalysts.

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