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Self-healing gold mirrors and filters at liquid-liquid interfaces

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Show simple item record Smirnov, Evgeny Peljo, Pekka Scanlon, Micheál D. Gumy, Frédéric Girult, Hubert H. 2020-01-11T15:04:55Z 2020-01-11T15:04:55Z 2016
dc.description peer-reviewed en_US
dc.description.abstract The optical and morphological properties of lustrous metal self-healing liquid-like nanofilms were systematically studied towards different applications (e.g., optical mirrors or filters). These nanofilms were formed by a one-step self-assembly methodology of gold nanoparticles (AuNPs) at immiscible water-oil interfaces, previously reported by our group. We investigated a host of experimental variables and report their influence on the optical properties of nanofilms: AuNP mean diameter, interfacial AuNP surface coverage, nature of the organic solvent, and nature of the lipophilic organic molecule that caps the AuNPs in the interfacial nanofilm. To probe the interfacial gold nanofilms we used both in situ (UV-vis-NIR spectroscopy and optical microscopy) as well as ex situ (SEM and TEM of interfacial gold nanofilms transferred to silicon substrates) techniques. The interfacial AuNP surface coverage strongly influenced the morphology of the interfacial nanofilms, and in turn their maximum reflectance and absorbance. We observed three distinct morphological regimes; (i) smooth 2D monolayers of "floating islands"Â of AuNPs at low surface coverages, (ii) a mixed 2D/3D regime with the beginnings of 3D nanostructures consisting of small piles of adsorbed AuNPs even at sub-full-monolayer conditions and, finally, (iii) a 3D regime characterised by the 2D full-monolayer being covered in significant piles of adsorbed AuNPs. A maximal value of reflectance reached 58% in comparison to a solid gold mirror, when 38 nm mean diameter AuNPs were used at a water-nitrobenzene interface. Meanwhile, interfacial gold nanofilms prepared with 12 nm mean diameter AuNPs exhibited the highest extinction intensities at ca. 690 nm and absorb around 90% of the incident light, making them an attractive candidate for filtering applications. Furthermore, the interparticle spacing, and resulting interparticle plasmon coupling derived optical properties, varied significantly on replacing tetrathiafulvalene with neocuproine as the AuNP capping ligand in the nanofilm. These interfacial nanofilms formed with neocuproine and 38 nm mean diameter AuNPs, at monolayer surface coverages and above, were black due aggregation and broadband absorbance. en_US
dc.language.iso eng en_US
dc.publisher Royal Society of Chemistry en_US
dc.relation 13SIRG2137 en_US
dc.relation.ispartofseries Nanoscale;8, pp. 7723-7737
dc.relation.uri!divAbstract doi=10.1039/C6NR00371K
dc.rights © 2016 Royal Society of Chemistry. Personal use of this material is permitted. Permission from Royal Society of Chemistry must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works en_US
dc.subject gold nanoparticles en_US
dc.subject soft interfaces en_US
dc.subject Self-healing en_US
dc.subject Mirror en_US
dc.subject Filter en_US
dc.title Self-healing gold mirrors and filters at liquid-liquid interfaces en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US 2020-01-10T16:33:25Z
dc.description.version ACCEPTED
dc.identifier.doi 10.1039/C6NR00371K
dc.contributor.sponsor Swiss National Science Foundation en_US
dc.contributor.sponsor SFI en_US
dc.relation.projectid Solar Fuel 2000-20_152 557/1 en_US
dc.relation.projectid 13/sirg/2137 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2697083
dc.internal.copyrightchecked Yes
dc.identifier.journaltitle Nanoscale
dc.description.status peer-reviewed

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