Surface modification of nanoporous anodic alumina photonic crystals for photocatalytic applications

Simple item page
dc.contributor.authorLim, S.
dc.contributor.authorLaw, C.
dc.contributor.authorSantos, A.
dc.contributor.conferenceSPIE Nanophotonics Australasia (10 Dec 2017 - 13 Dec 2017 : Melbourne)
dc.contributor.editorChon, J.W.M.
dc.contributor.editorJia, B.
dc.date.issued2018
dc.description.abstractHerein, we report on the development of a rationally designed composite photocatalyst material by combining nanoporous anodic alumina-rugate filters (NAA-RFs) with photo-active layers of titanium dioxide (TiO2). NAA-RFs are synthesised by sinusoidal pulse anodisation and subsequently functionalised with TiO2 by sol-gel method to provide the photonic structures with photocatalytic properties. We demonstrate that the characteristic photonic stopband (PSB) of the surface-modified NAA-RFs can be precisely tuned across the UV-visible-NIR spectrum to enhance the photon-toelectron conversion of TiO2 by ‘slow photon effect’. We systematically investigate the effect of the anodisation parameters (i.e. anodisation period and pore widening time) on the position of the PSB of NAA-RFs as well as the photocatalytic performances displayed by these photonic crystal structures. When the edges of the PSB of surfacemodified NAA-RFs are positioned closely to the absorption peak of the model organic dye (i.e. methyl orange – MO), the photocatalytic performance of the system to degrade these molecules is enhanced under simulated solar light irradiation due to slow photon effect. Our investigation also reveals that the photocatalytic activity of surface-modified NAA-RFs is independent of slow photon effect and enhances with increasing period length (i.e. increasing anodisation period) of the photonic structures when there is no overlap between the PSB and the absorption peak of MO. This study therefore provides a rationale towards the photocatalytic enhancement of photonic crystals by a rational design of the PSB, creating new opportunities for the future development of high-performance photocatalysts.
dc.description.statementofresponsibilitySiew Yee Lim, Cheryl Suwen Law, Abel Santos
dc.identifier.citationProceedings of SPIE, 2018 / Chon, J.W.M., Jia, B. (ed./s), vol.10456, pp.1045658-1-1045658-9
dc.identifier.doi10.1117/12.2282248
dc.identifier.isbn9781510613935
dc.identifier.issn0277-786X
dc.identifier.issn1996-756X
dc.identifier.orcidLim, S. [0000-0002-5677-9039]
dc.identifier.orcidLaw, C. [0000-0002-3276-8052]
dc.identifier.orcidSantos, A. [0000-0002-5081-5684]
dc.identifier.urihttp://hdl.handle.net/2440/125045
dc.language.isoen
dc.publisherSPIE Press
dc.relation.ispartofseriesProceedings of SPIE; 10456
dc.rights© 2018 SPIE
dc.source.urihttps://doi.org/10.1117/12.2282248
dc.subjectPhotocatalysis; nanoporous anodic alumina; photonic stopband; photonic crystal; anodisation; solar light; photolysis
dc.titleSurface modification of nanoporous anodic alumina photonic crystals for photocatalytic applications
dc.typeConference paper
pubs.publication-statusPublished

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
hdl_125045.pdf
Size:
775.19 KB
Format:
Adobe Portable Document Format
Description:
Published version
Download

Collections

Chemical Engineering publications
IPAS publications