Browsing by Author "GOUNKO, IOURI"
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Amplified spontaneous emission from a microtube cavity with whispering gallery modes
DONEGAN, JOHN; PEROVA, TANIA; RAKOVICH, YURY; GOUNKO, IOURI (2007)We present a detailed study of the photonic modes in microtube cavity of ~ 7-8 ?m outer diameter that can act as micron-scale optical cylindrical resonator. We demonstrate a new route to the fabrication of individual ... -
Anomalous magnetic field effects during pulsed injection metal-organic chemical vapor deposition of magnetite films
GOUNKO, IOURI; ZUKOVA, ANNA (2010)We report on large external magnetic field effects during pulsed injection metal-organic chemical vapor deposition of magnetite films on MgO 001 . The application of a 1 T field during the growth process significantly ... -
Bimodal magnetic-fluorescent nanostructures for biomedical applications
KERSKENS, CHRISTIAN; GOUNKO, IOURI; LYNCH, MARINA (2009)Magnetite-based polyelectrolyte-coated nanostructures were fabricated and the potential for biomedical application assessed in mixed glial cell cultures with nanostructure cellular internalization, cytotoxicty and contribution ... -
Chiral luminescent CdS nano-tetrapods
GOVAN, JOSEPH; GOUNKO, IOURI (Royal Society of Chemistry, 2010)The utilisation of chiral penicillamine stabilisers allowed the preparation of new water soluble white emitting CdS nano-tetrapods, which demonstrated circular dichroism in the band-edge region of the spectrum. -
Chiral nanoparticle assemblies: circular dichroism, plasmonic interactions, and exciton effects
GOUNKO, IOURI; GERARD, VALERIE ANNE (2011)The paper reviews recent progress on chiral nanocrystal assemblies with induced optical chirality and related circular dichroism. Many natural molecules and biomolecules are chiral and exhibit remarkably strong optical ... -
Chiral quantum supercrystals with total dissymmetry of optical response
GOUNKO, IOURI (2016)Since chiral nanoparticles are much smaller than the optical wavelength, their enantiomers show little difference in the interaction with circularly polarized light. This scale mismatch makes the enhancement of enantioselectivity ... -
Completely Chiral Optical Force for Enantioseparation
GOUNKO, IOURI (2016)Fast and reliable separation of enantiomers of chiral nanoparticles requires elimination of all the forces that are independent of the nanoparticle handedness and creation of a sufficiently strong force that either pushes ... -
Confined optical modes and amplified spontaneous emission from a microtube cavity formed by vacumm assisted filtration
GOUNKO, IOURI; DONEGAN, JOHN FRANCIS; PEROVA, TANIA; RAKOVICH, YURY (American Physical Society, 2006)The authors demonstrate a new route to the fabrication of individual aluminosilicate microtubes that can act as micron-scale optical cylindrical resonators. The microtubes were prepared using a simple vacuum assisted wetting ... -
Covalently functionalized hexagonal boron nitride nanosheets by nitrene addition
SATTI, AMRO; COLEMAN, JONATHAN NESBIT; GOUNKO, IOURI; MAY, PETER; O'NEILL, ARLENE; NICOLOSI, VALERIA (Wiley, 2012)Exfoliated h-BN nanosheets were covalently functionalized via a one-step nitrene addition using azide precursor molecules. Functionalized h-BN nanosheets were found to exhibit markedly enhanced dispersability relative to ... -
Development of transparent, conducting composites by surface infiltration of nanotubes into commercial polymer films
COLEMAN, JONATHAN; GOUNKO, IOURI (2009)Here we present a novel technique for the preparation of thin, transparent and conducting, nanotube containing layers at the surface of commercially available polyethylene films. This is achieved by the swelling of the ... -
Dynamic in-situ sensing of fluid-dispersed 2D materials integrated on microfluidic Si chip
PEROVA, TANIA; GOUNKO, IOURI (2017)In this work, we propose a novel approach for wafer-scale integration of 2D materials on CMOS photonic chip utilising methods of synthetic chemistry and microfluidics technology. We have successfully demonstrated that this ... -
Emission Properties of Colloidal Quantum Dots on Polyelectrolyte Multilayers
BRADLEY, LOUISE; GOUNKO, IOURI; RAKOVICH, YURY (2006)We present steady state and time-resolved photoluminescence (PL) characteristics of differently charged CdTe quantum dots (QDs) adsorbed onto a polyelectrolyte (PE) multilayer. The PE multilayer is built up using a ... -
Fabrication and characterisation of photonic nanowires
GOUNKO, IOURI (SPIE, 2008)In recent years the application of nano-porous templates, such as anodic alumina and PTFE, in the production of cylindrical nanostructures has been vast. In our work we used porous alumina membranes to produce luminescent ... -
Folic acid modified gelatine coated quantum dots as potential reagents for in vitro cancer diagnostics.
GOUNKO, IOURI; GERARD, VALERIE; MAGUIRE, CIARAN (2011)BACKGROUND: Gelatine coating was previously shown to effectively reduce the cytotoxicity of CdTe Quantum Dots (QDs) which was a first step towards utilising them for biomedical applications. To be useful they also need ... -
Giant Optical Activity of Quantum Dots, Rods, and Disks with Screw Dislocations
GOUNKO, IOURI (2015)For centuries mankind has been modifying the optical properties of materials: first, by elaborating the geometry and composition of structures made of materials found in nature, later by structuring the existing materials ... -
Graphene, carbon nanotube and ionic liquid mixtures: Towards new quasi-solid state electrolytes for dye sensitised solar cells
GOUNKO, IOURI; KHAN, UMAR (2011)In this work carbon based nanomaterials in ionic liquids have been studied as potential electrolytes for dye sensitised solar cells (DSSCs). Graphene, single wall carbon nanotubes (SWCNTs) and a mixture of graphene and ... -
Graphene-ionic liquid electrolytes for dye sensitised solar cells
BRENNAN, LORCAN; SATTI, AMRO; BARWICH, SEBASTIAN; GOUNKO, IOURI (2013)In this work two dimensional graphene flakes were used to prepare new electrolytes for dye sensitized solar cells (DSSCs). Small amounts (up to 3 wt%) of graphene nanoflakes were suspended into the ionic liquid (IL) ... -
High-yield production of graphene by liquid-phase exfoliation of graphite
GOUNKO, IOURI; NICOLOSI, VALERIA; GOODHUE, ROBBIE; SCARDACI, VITTORIO; COLEMAN, JONATHAN NESBIT; BOLAND, JOHN; DUESBERG, GEORG STEFAN (2008)Graphene is at the centre of nanotechnology research. In order to fully exploit its outstanding properties, a mass production method is necessary. Two main routes are possible: large-scale growth or large-scale exfoliation. ... -
Highly efficient Forster resonance energy transfer between CdTe nanocrystals and two different dye molecules
DONEGAN, JOHN; RAKOVICH, YURY; BRADLEY, LOUISE; GOUNKO, IOURI (2004)We report highly efficient Forster resonance energy transfer between CdTe nanocrystals and two different dyes, Rhodamine B and Oxazine, where the nanocrystals are mixed with the dyes on top of glass substrates. A faster ... -
Highly emissive CdTe nanowires grown in a phosphate buffer solution: FLIM imaging and spectroscopic studies
GOUNKO, IOURI; RAKOVICH, YURY; DONEGAN, JOHN (2007)We present details on the formation and optical peroperties of CdTe nanowires, which were found to grow in a standard phosphate-buffered solution, including micro-photoluminescence and fluorescence lifetime imaging.