Browsing Physics (Scholarly Publications) by Author "GOUNKO, IOURI"
Now showing items 1-11 of 11
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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 ... -
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 ... -
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 ... -
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. -
Off-resonance surface plasmon enhanced spontaneous emission from CdTe quantum dots
BRADLEY, LOUISE; RAKOVICH, YURY; GOUNKO, IOURI (2006)Surface plasmon (SP) enhanced photoluminescence (PL) from CdTe quantum dots (QDs) on monolayers of Au nanoparticles is investigated under both resonant and nonresonant conditions. Enhancement of the QD PL intensity is ... -
Oxygen radical functionalization of boron nitride nanosheets
MAY, PETER; COLEMAN, JONATHAN; MCGOVERN, IGNATIUS; GOUNKO, IOURI; SATTI, AMRO (2012)The covalent chemical functionalization of exfoliated hexagonal boron-nitride nanosheets (BNNSs) is achieved by the solution phase oxygen radical functionalization of boron atoms in the h-BN lattice. This involves a two-step ... -
The preparation of hybrid films of carbon nanotubes and nanographite/graphene with excellent mechanical and electrical properties
COLEMAN, JONATHAN; KHAN, UMAR; O'CONNOR, IAN EDWARD; GOUNKO, IOURI (2010)We have prepared mixed dispersions of single walled nanotubes and nano-graphite / graphene in the solvent N-methyl pyrrolidone. This allows the deposition of hybrid films by vacuum filtration. Scanning electron microscopy ... -
Spontaneous emission enhancement in a microtube cavity with highly confined optical modes'
DONEGAN, JOHN; PEROVA, TANIA; GOUNKO, IOURI; RAKOVICH, YURY (SPIE, 2007)A detailed study of the photonic modes in microtube cavity of ~ 7-8 ?m outer diameter is presented. We demonstrate a new route to the fabrication of individual microtubes with the maximum length of 200 ?m, using a vacuum ...