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Demonstration of Slow Photon Chemistry onMultilayer Inverse Opals
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0003-0296-5247
2016 (English)In: Science of Advanced Materials, ISSN 1947-2935, Vol. 8, 1-6 p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate the use of atomic layer deposited multilayered alumina/titania photonic crystals for stearicacid (SA) degradation using broadband light illumination. The degradation of SA was monitored every 15 minutes by Fourier transform infrared spectroscopy, using a simple rotation of the sample holder to switchbetween light source and infrared probing beam. We analyzed four samples with different photonic bandgap(PBG) positions, from 397 to 372 nm, with different titania layer thicknesses, but otherwise prepared in identicalmanner. With this approach the photonic efficiency (PE) could readily be calculated without having to considerdifferent sample preparation procedure. We found that a sample with a high-energy edge of the PBG positionoverlapping with the electronic bandgap position of titania (Eg∼ 385 nm) and the highest photon power of ourlight source had the highest PE = 0.002. Comparison with the other samples shows that the slow photon effectapparent at the PBG edge can explain the higher PE, and suggest that bandgap engineering of multilayerphotonic materials is a practically viable method to improve the efficiency of a photocatalyst.

Place, publisher, year, edition, pages
United States of America, 2016. Vol. 8, 1-6 p.
Keyword [en]
Photocatalysis, Photonic Crystals, Slow Photon, Titania, Stearic Acid.
National Category
Nano Technology
Research subject
Engineering Science with specialization in Materials Science
Identifiers
URN: urn:nbn:se:uu:diva-305260DOI: 10.1166/sam.2016.2833OAI: oai:DiVA.org:uu-305260DiVA: diva2:1037123
Funder
Swedish Research Council, 2010- 3514
Available from: 2016-10-13 Created: 2016-10-13 Last updated: 2016-10-14

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