A5017866416- Nonlinear Optical Materials Studies
- Photochromic and Fluorescence Chemistry
- Luminescence and Fluorescent Materials
- Nonlinear Optical Materials Research
- Photochemistry and Electron Transfer Studies
- Laser-Matter Interactions and Applications
- Porphyrin and Phthalocyanine Chemistry
- Crystallization and Solubility Studies
- Graphene research and applications
- X-ray Diffraction in Crystallography
- Organic Light-Emitting Diodes Research
- Advanced Fiber Laser Technologies
- Carbon Nanotubes in Composites
- Organic Electronics and Photovoltaics
- Intraocular Surgery and Lenses
- Nonlinear Waves and Solitons
- Advanced Sensor and Energy Harvesting Materials
- Tribology and Lubrication Engineering
- Diamond and Carbon-based Materials Research
- Nonlinear Photonic Systems
- Advanced Fluorescence Microscopy Techniques
- Photoacoustic and Ultrasonic Imaging
- Graphene and Nanomaterials Applications
- 2D Materials and Applications
- Gear and Bearing Dynamics Analysis
University of Patras
2008-2024
National Technical University of Athens
2024
Foundation for Research and Technology Hellas
2015-2022
FORTH Institute of Chemical Engineering Sciences
2018
Hella (Germany)
2015
AlbaNova
2009
KTH Royal Institute of Technology
2009
A series of dipolar and octupolar triphenylamine-derived dyes containing a benzothiazole positioned in the matched or mismatched fashion have been designed synthesized via palladium-catalyzed Sonogashira cross-coupling reactions. Linear nonlinear optical properties molecules were tuned by an additional electron-withdrawing group (EWG) changing relative positions donor acceptor substituents on heterocyclic ring. This allowed us to examine effect positional isomerism extend structure–property...
The stress transfer mechanism from a polymer substrate to nanoinclusion, such as graphene flake, is of extreme interest for the production effective nanocomposites. Previous work conducted mainly at micron scale has shown that intrinsic shear interface. However, since interfacial takes its maximum value very edge nanoinclusion it assess effect integrity upon axial submicron scale. Here, we conduct detailed Raman line mapping near edges monolayer flake simply supported onto an epoxy-based...
A computer-aided design of novel D−π–A−π–D styrylamines containing five isomeric benzobisthiazole moieties as the electron-accepting core has revealed linear centrosymmetric benzo[1,2-d:4,5-d′]bisthiazole most promising building block for engineering chromophores displaying high two-photon absorption (TPA) in near-IR region, also confirmed experimentally. The ease synthesis quadrupolar derivatives thereof, combined with extraordinarly TPA action cross sections (δTPAΦf > 1500 GM), makes these...
A series of twelve tripodal push-pull molecules with a central triphenylamine donor and peripheral cyano substituted acceptors has been prepared.
A new methodology is described here for the true uniaxial deformation of suspended monolayer graphene.
Direct iodination of benzothiazoles under strong oxidative/acidic conditions leads to a mixture iodinated heteroarenes with 1–2 major components, which are easily separable and structures depend on the I2 equivalents used. Among unexpected but dominant products were identified 4,7-diiodobenzothiazoles rare substitution pattern for SEAr reactions this scaffold. These employed in synthesis 4,7-bis(triarylamine-ethynyl)benzothiazoles — new class highly efficient quasi-quadrupolar fluorophores...
Copper(II)-catalyzed C–H/C–H coupling of dipolar 2-H-benzothiazoles end-capped with triphenylamine moieties affords highly fluorescent 2,2′-bibenzothiazoles quadrupolar (D-π-A-π-D) architecture displaying large two-photon absorption (TPA) cross sections (543–1252 GM) in the near-infrared region. The notably higher TPA performance as compared to π-systems a widely used 2,2′-bipyridine core, along ease synthesis and chelating N^N ability, makes title biheteroaryl platform an attractive...
Stable graphene dispersions in chloroform, using very low pyrene-functionalized polymer/graphite mass ratio.
Pyrene-functional PMMAs were prepared via ATRP-controlled polymerization and click reaction, as efficient dispersing agents for the exfoliation of few-layered graphene sheets (GS) in easily processable low boiling point chloroform. In parallel, detailed atomistic simulations showed fine dispersion GS/polymer hybrids good agreement with experiment. Moreover, molecular dynamics revealed interesting conformations (bridges, loops, dangling ends, free chains) allowed us to monitor their time...
The photobleaching properties of a 3D memory material based on pyrylium salts are studied. It is shown that under ultrashort pulsed irradiation occurs through two diverse mechanisms. One major and causes fast bleaching, whereas the other minor slow bleaching. Furthermore, it proved both mechanisms three- or more-photon processes. This fact gives capability significantly increasing data storage density.
Two photon absorption (TPA) and photophysical properties of three new symmetrical chromophores with electron accepting phthalimide edge substituents have been studied. The contain fluorene, alcoxy-substituted divinyl benzene, carbazole moieties as central cores, respectively. femtosecond time-resolved fluorescence upconversion spectroscopy two excited technique carried out. effect solvent polarity on TPA photophysics has also determined. Ultrafast dynamics, decay times ranging from 1 to 13...
Chemical vapor deposition (CVD) is regarded as a promising fabrication method for the automated, large-scale, production of graphene and other two-dimensional materials. However, its full commercial exploitation limited by presence structural imperfections such folds, wrinkles, even cracks that downgrade physical mechanical properties. For example, shown here means Raman spectroscopy, stress transfer from an epoxy matrix to CVD on average 30% exfoliated monolayer over 10 μm in dimensions....
Gaussian decomposition is used as a theoretical infrastructure with which Z-scan experiments are analyzed. This procedure extended here to the interesting, from practical point of view, case in laser beam not perfectly Gaussian. We follow perturbative approach obtain far-field pattern after passes through nonlinear sample. The based on electric field at exit plane sample linear combination Hermite–Gaussian functions. To first-order approximation, each mode incident decomposed different-order...
Abstract Star‐shaped molecules with a gradually varied number of peripheral acceptors were designed, synthesized, and subsequently investigated by using differential scanning calorimetry, electrochemistry, linear absorption emission spectra. Two‐photon properties studied two‐photon fluorescence. Experimental data completed the results quantum chemical calculations thorough structure‐property relationships elucidated. The performed analysis showed that structural features such as CN groups,...