1,721,025 research outputs found
Effect of hybrid isolation on the luminescence enhancement of carbon nanotube-gold nanorod composites
No full textNanoplasmonic colloidal suspensions for the enhancement of the luminescent emission from single-walled carbon nanotubes
No full textAiming to enhance the luminescence yield of carbon nanotubes, we introduce
a new class of hybrid nanoplasmonic colloidal systems (π-hybrids). Nanotubes
dispersed in gold nanorod colloidal suspensions yield hybrid structures
exhibiting enhanced luminescence up to a factor of 20. The novelty of the
proposed enhancement mechanism relies on including metal proximity effects
in addition to its localized surface plasmons. This simple, robust and flexible
technique enhances the luminescence of nanotubes with chiralities whose
enhancement has never reported before, for example the (8,4) tube
Optimization of the nanoplasmonic hybridization process for the enhancement of the optical response of single-walled carbon nanotubes
No full textHere we present our results on the optimization of a nanometallic-carbon
nanotubes plasmonic hybridization process to enhance the photoluminescence quantum
yield of single walled carbon nanotubes. Swelling the micelles containing the hybrids
through an organic solvent improves the matching between the hybrids constituents; the
optimized hybrids exhibit enhancement of the emitted photoluminescence without affecting
the physical mechanisms involved in the exciton-plasmon coupling process
Chirally enhanced solubilization through perylene-based surfactant
No full textRecently we introduced a rationally designed surfactant which forms energy transfer complexes with carbon nanotubes. We investigate the chiral selectivity of this compound, a perylene derived surfactant, through photoluminescence (PL) measurements, and find a strong enhancement of the luminescence intensity for one particular group of chiralities. The effect is striking, with luminescence increases of several hundred percent.
Chiral selectivity of the investigated surfactant compound as compared to solubilization through sodium cholate (SC). Small numbers indicate chirality, large numbers laola family
Functional Surfactants for Carbon Nanotubes: Effects of Design
No full textSurfactants are needed to create stable suspensions of carbon nanotubes. Increasingly, these surfactants are given additional functionalities, resulting in bigger and more complex molecules with several subunits. We investigate the effect of assembly of these subunits for a class of perylene-based functional surfactants. The subunits that all surfactants are based on are a perylene core, hydrophilic polyglycerol dendrons, and alkyl chains of different orientations and lengths. The assembly of these subunits affects both the molecules' performance as a surfactant and the efficiency of the energy-transfer complexes formed by the nanotube and surfactant through a π–π stacking mechanism. This results in a best practice guide for designing functional surfactants with π–π stacking cores, and affords more general insights that are applicable to non π–π stacking systems as well
Highly sensitive optochemical gas detection by luminescent marine diatoms
No full textThe modifications of photoluminescence properties of silica frustules of different marine diatoms induced by adsorption of nitrogen dioxide, methane, and carbon monoxide are reported. Different species of diatoms were found to exhibit different relative responses and different gas concentration ranges of sensitivity, depending on the morphology and porosity of their frustules. The photoluminescence quenching shows surface signature, exhibiting a coverage-limited kinetics according to a Langmuir mechanism. Due to the large variety of dimensions, porosities, and surface morphologies available in nature, these materials appear to be promising to improve the selectivity of gas sensing based on photoluminescence optochemical transduction
Crystallization of Hydrogenated Amorphous Silicon Carbon Films with Laser and Thermal Annealing
No full textOn-off intermittency in chaotic rotation induced in liquid crystals by the competition between spin and orbital angular momentum of light
No full text(Brief Report
On-off intermittency in chaotic rotation induced in liquid crystals by the competition between spin and orbital angular momentum of light
No full text(Brief Report
The orbital angular momentum of light: a new source of optical torque in liquid crystals
No full text- …
