000217194 001__ 217194
000217194 005__ 20190317000416.0
000217194 0247_ $$2doi$$a10.1039/C6NR00371K
000217194 022__ $$a2040-3372
000217194 02470 $$2ISI$$a000373722000044
000217194 037__ $$aARTICLE
000217194 245__ $$aSelf-Healing Gold Mirrors and Filters at Liquid-Liquid Interfaces
000217194 260__ $$bRoyal Soc Chemistry$$c2016$$aCambridge
000217194 269__ $$a2016
000217194 300__ $$a15
000217194 336__ $$aJournal Articles
000217194 520__ $$aThe 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” 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.
000217194 700__ $$0246944$$g227763$$aSmirnov, Evgeny
000217194 700__ $$0247474$$g218461$$aPeljo, Pekka Eero
000217194 700__ $$0245629$$g217888$$aScanlon, Micheal
000217194 700__ $$aGumy, Frederic
000217194 700__ $$g105258$$aGirault, Hubert$$0242739
000217194 773__ $$j8$$tNanoscale$$q7723-7737
000217194 8564_ $$uhttps://infoscience.epfl.ch/record/217194/files/GA.gif$$zTOC figure$$s27033$$yTOC figure
000217194 8564_ $$uhttps://infoscience.epfl.ch/record/217194/files/c6nr00371k.pdf$$zPublisher's version$$s5705908$$yPublisher's version
000217194 8564_ $$uhttps://infoscience.epfl.ch/record/217194/files/c6nr00371k1.pdf$$zSupporting Information$$s1466946$$ySupporting Information
000217194 909C0 $$xU10100$$0252090$$pLEPA
000217194 909CO $$ooai:infoscience.tind.io:217194$$qGLOBAL_SET$$pSB$$particle
000217194 917Z8 $$x208650
000217194 917Z8 $$x208650
000217194 937__ $$aEPFL-ARTICLE-217194
000217194 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000217194 980__ $$aARTICLE