Development of large-scale colloidal crystallisation methods for the production of photonic crystals

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dc.contributor.advisor Pemble, Martyn E. en McGrath, Joseph 2015-10-23T11:22:51Z 2015-10-23T11:22:51Z 2014 2014
dc.identifier.citation McGrath, J. 2014. Development of large-scale colloidal crystallisation methods for the production of photonic crystals. PhD Thesis, University College Cork. en
dc.identifier.endpage 242
dc.description.abstract Colloidal photonic crystals have potential light manipulation applications including; fabrication of efficient lasers and LEDs, improved optical sensors and interconnects, and improving photovoltaic efficiencies. One road-block of colloidal selfassembly is their inherent defects; however, they can be manufactured cost effectively into large area films compared to micro-fabrication methods. This thesis investigates production of ‘large-area’ colloidal photonic crystals by sonication, under oil co-crystallization and controlled evaporation, with a view to reducing cracking and other defects. A simple monotonic Stöber particle synthesis method was developed producing silica particles in the range of 80 to 600nm in a single step. An analytical method assesses the quality of surface particle ordering in a semiquantitative manner was developed. Using fast Fourier transform (FFT) spot intensities, a grey scale symmetry area method, has been used to quantify the FFT profiles. Adding ultrasonic vibrations during film formation demonstrated large areas could be assembled rapidly, however film ordering suffered as a result. Under oil cocrystallisation results in the particles being bound together during film formation. While having potential to form large areas, it requires further refinement to be established as a production technique. Achieving high quality photonic crystals bonded with low concentrations (<5%) of polymeric adhesives while maintaining refractive index contrast, proved difficult and degraded the film’s uniformity. A controlled evaporation method, using a mixed solvent suspension, represents the most promising method to produce high quality films over large areas, 75mm x 25mm. During this mixed solvent approach, the film is kept in the wet state longer, thus reducing cracks developing during the drying stage. These films are crack-free up to a critical thickness, and show very large domains, which are visible in low magnification SEM images as Moiré fringe patterns. Higher magnification reveals separation between alternate fringe patterns are domain boundaries between individual crystalline growth fronts. en
dc.description.sponsorship Science Foundation Ireland (SFI PI Grant 07/NI.1/I787); Higher Education Authority (PRTLI Project INSPIRE) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2014, Joseph McGrath en
dc.rights.uri en
dc.subject Stober synthesis en
dc.subject Colloidal photonic crystals en
dc.subject Controlled evaporation en
dc.subject Production methods en
dc.title Development of large-scale colloidal crystallisation methods for the production of photonic crystals en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text available en No embargo required en
dc.description.version Accepted Version
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder Higher Education Authority en
dc.description.status Not peer reviewed en Chemistry en Tyndall National Institute en
dc.check.type No Embargo Required
dc.check.reason No embargo required en
dc.check.opt-out Not applicable en
dc.thesis.opt-out false
dc.check.embargoformat Not applicable en
dc.internal.conferring Spring Conferring 2015

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© 2014, Joseph McGrath Except where otherwise noted, this item's license is described as © 2014, Joseph McGrath
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