Browsing by Subject "Optical properties"
Now showing items 1-20 of 28
-
Article
Alignment of electrospun polymer fibers using a concave collector
(2015)During recent years, electrospinning has become a powerful technique for the cost-effective production of fibrous materials with diameters ranging from a few nanometers up to a few micrometers. In a conventional electrospinning ...
-
Article
Determination of critical points on silicon nanofilms: Surface and quantum confinement effects
(2008)In this work, we present a comprehensive study of the optical properties of nanocrystalline silicon films with thickness varied from 5 to 30 nm. Spectroscopic ellipsometry is employed to determine the dielectric functions ...
-
Article
Direct observation of excitons in polymer/carbon nanotube composites at room temperature: The influence of nanotube concentration
(2008)In this work, we have employed spectroscopic ellipsometry technique to study the optical properties of polymer/carbon nanotube (CN) composites as a function of nanotube concentration. Using a two-layer structural model ...
-
Article
Effect of pigment dispersion on optical properties and durability of a TiO2 pigmented epoxy coating
(2009)The effect of pigment dispersion on (i) surface morphology and appearance, and (ii) the weathering durability of a TiO2 pigmented epoxy coating was investigated. The microstructure and dispersion of pigmented epoxy coatings ...
-
Article
Electrical, structural, and optical properties of sulfurized Sn-doped In2O3 nanowires
(2015)Sn-doped In2O3 nanowires have been grown on Si via the vapor-liquid-solid mechanism at 800 °C and then exposed to H2S between 300 to 600 °C. We observe the existence of cubic bixbyite In2O3 and hexagonal SnS2 after processing ...
-
Article
Electrical, structural, and optical properties of sulfurized Sn-doped In2O3 nanowires
(2015)Sn-doped In2O3 nanowires have been grown on Si via the vapor-liquid-solid mechanism at 800 °C and then exposed to H2S between 300 to 600 °C. We observe the existence of cubic bixbyite In2O3 and hexagonal SnS2 after processing ...
-
Article
Linear dynamic polarizability and the absorption spectrum of an exciton in a quantum ring in a magnetic field
(2011)The problem of an electron-hole system interacting through a contact potential and moving in a one-dimensional quantum ring threaded by an Aharonov-Bohm flux is considered, with respect to the system's energetics as well ...
-
Conference Object
On the optical properties of thermoelectric alkali metal chalcogenide compounds
(Affiliation: Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceAffiliation: Department of Chemistry, Michigan State University, East Lansing, MI 48824, United StatesAffiliation: Department of Mechanical and Manufacturing Engineering, University of Cyprus, 1678 Nicosia, CyprusCorrespondence Address: Hatzikraniotis, E.Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece, 2006)Solid solutions of K2Bi8-xSbxSe 13 is an interesting series of complex bismuth-chalcogenide compounds, which are attractive for thermoelectric investigations. The highly anisotropic structure in these compounds results in ...
-
Article
Optical and electrical properties of selectively delta-doped strained InxGa1-xAs/GaAs quantum wells
(1996)We report here an investigation of selectively delta-doped strained InGaAs/GaAs quantum wells. Electronic structures of the systems were calculated by self-consistently solving the Schrödinger and Poisson equations and the ...
-
Article
Optical properties of conjugated poly(3-hexylthiophene)/ [6,6] -phenyl C61 -butyric acid methyl ester composites
(2007)In this work, we present the evolution of optical constants as a function of [6,6] -phenyl C61 -butyric acid methyl ester (PCBM) concentration for conjugated poly(3-hexylthiophene)/ [6,6] -phenyl C61 -butyric acid methyl ...
-
Article
Optical properties of organic semiconductor blends with near-infrared quantum-dot sensitizers for light harvesting applications
(2011)We report an optical investigation of conjugated polymer (P3HT)/fullerene (PCBM) semiconductor blends sensitized by near-infrared absorbing quantum dots (PbS QDs). A systematic series of samples that include pristine, ...
-
Article
Phase shifted Bragg gratings formed in optical fibres by post-fabrication thermal processing
(1996)Fibre Bragg gratings have been post-fabrication processed using localised heat treatment, with significant changes to their transmission and reflection characteristics being observed. Experimental results of the spectral ...
-
Article
Quantum confinement and interface structure of Si nanocrystals of sizes 3-5 nm embedded in a-SiO2
(2007)Spectroscopic ellipsometry and Monte Carlo simulations are employed to answer the fundamental question whether the energy gaps of Si nanocrystals with sizes in the range of 3-5 nm, which are embedded in amorphous silica, ...
-
Article
Spectroscopic characterization of C-4 substituted 3,5-dichloro-4H-1,2,6-thiadiazines
(2015)Three 3,5-dichloro-4H-1,2,6-thiadiazines, which differ according to the electron withdrawing nature of their substituent at C-4: (a) 3,5-dichloro-4-methylene-4H-1,2,6-thiadiazine (5a), (b) 3,5-dichloro-4H-1,2,6-thiadiazin-4-one ...
-
Article
Study of the annealing kinetic effect and implantation energy on phosphorus-implanted silicon wafers using spectroscopic ellipsometry
(2006)In this work, we have studied the changes in the optical properties on crystalline silicon implanted wafers (1 × 1013-1 × 1016 P+/cm2) using an extensive ellipsometric analysis. The effects of implantation energy (20-180 ...
-
Article
Superparamagnetic hybrid micelles, based on iron oxide nanoparticles and well-defined diblock copolymers possessing β-ketoester functionalities
(2009)The quality of surface coating of magnetic nanoparticles destined as nanoprobes in clinical applications is of utmost significance for their colloidal stability and biocompatibility. A novel approach for the fabrication ...
-
Article
A systematic study of the nitridation of SnO 2 nanowires grown by the vapor liquid solid mechanism
(2012)SnO 2 nanowires (NWs) with diameters of 50 nm and lengths ≥10 μm have been grown at 800 °C on 1.0 nm Au/Si(001) via the vapor liquid solid mechanism and the low pressure chemical vapor deposition. These exhibited clear ...
-
Article
A systematic study of the nitridation of SnO 2 nanowires grown by the vapor liquid solid mechanism
(2012)SnO 2 nanowires (NWs) with diameters of 50 nm and lengths ≥10 μm have been grown at 800 °C on 1.0 nm Au/Si(001) via the vapor liquid solid mechanism and the low pressure chemical vapor deposition. These exhibited clear ...
-
Article
Third-order optical nonlinearities of PVP/Pd nanohybrids
(2017)Pd nanoparticles stabilized by polyvinylpyrrolidone were synthesized following mild reduction of palladium ion complexes. Their morphology and optical properties were characterized using Transmission Electron Microscopy, ...
-
Article
Tin oxide nanowires: The influence of trap states on ultrafast carrier relaxation
(2009)We have studied the optical properties and carrier dynamics in SnO 2 nanowires (NWs) with an average radius of 50 nm that were grown via the vapor-liquid solid method. Transient differential absorption measurements have ...