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dc.contributor.authorLaw, C.en
dc.contributor.authorSantos, A.en
dc.contributor.authorNemati, M.en
dc.contributor.authorLosic, D.en
dc.identifier.citationACS Applied Materials and Interfaces, 2016; 8(21):13542-13554en
dc.description.abstractThis study presents a sawtooth-like pulse anodization approach aiming to create a new type of photonic crystal structure based on nanoporous anodic alumina. This nanofabrication approach enables the engineering of the effective medium of nanoporous anodic alumina in a sawtooth-like manner with precision. The manipulation of various anodization parameters such as anodization period, anodization amplitude, number of anodization pulses, ramp ratio and pore widening time allows a precise control and fine-tuning of the optical properties (i.e., characteristic transmission peaks and interferometric colors) exhibited by nanoporous anodic alumina photonic crystals (NAA-PCs). The effect of these anodization parameters on the photonic properties of NAA-PCs is systematically evaluated for the establishment of a fabrication methodology toward NAA-PCs with tunable optical properties. The effective medium of the resulting NAA-PCs is demonstrated to be optimal for the development of optical sensing platforms in combination with reflectometric interference spectroscopy (RIfS). This application is demonstrated by monitoring in real-time the formation of monolayers of thiol molecules (11-mercaptoundecanoic acid) on the surface of gold-coated NAA-PCs. The obtained results reveal that the adsorption mechanism between thiol molecules and gold-coated NAA-PCs follows a Langmuir isotherm model, indicating a monolayer sorption mechanism.en
dc.description.statementofresponsibilityCheryl Suwen Law, Abel Santos, Mahdieh Nemati, and Dusan Losicen
dc.publisherAmerican Chemical Societyen
dc.rights© 2016 American Chemical Societyen
dc.subjectSawtooth-like pulse anodization; structural engineering; nanoporous anodic alumina; photonic crystals; reflectometric interference spectroscopyen
dc.titleStructural engineering of nanoporous anodic alumina photonic crystals by sawtooth-like pulse anodizationen
dc.typeJournal articleen
pubs.library.collectionChemical Engineering publicationsen
dc.identifier.orcidLaw, C. [0000-0002-3276-8052]en
dc.identifier.orcidSantos, A. [0000-0002-5081-5684]en
dc.identifier.orcidLosic, D. [0000-0002-1930-072X]en
Appears in Collections:Chemical Engineering publications

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