A5066992044- Graphene research and applications
- Carbon Nanotubes in Composites
- 2D Materials and Applications
- MXene and MAX Phase Materials
- Thermal properties of materials
- Magnetism in coordination complexes
- Perovskite Materials and Applications
- Graphene and Nanomaterials Applications
- Diamond and Carbon-based Materials Research
- Lanthanide and Transition Metal Complexes
- Advanced Sensor and Energy Harvesting Materials
- Boron and Carbon Nanomaterials Research
- Fiber-reinforced polymer composites
- Electron Spin Resonance Studies
- Nanopore and Nanochannel Transport Studies
- Innovative Microfluidic and Catalytic Techniques Innovation
- Calcium Carbonate Crystallization and Inhibition
- Advanced Materials and Mechanics
- Plasmonic and Surface Plasmon Research
- Microfluidic and Bio-sensing Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced NMR Techniques and Applications
- biodegradable polymer synthesis and properties
- Tribology and Wear Analysis
- Organic and Molecular Conductors Research
Foundation for Research and Technology Hellas
2016-2025
FORTH Institute of Chemical Engineering Sciences
2007-2024
University of Patras
2006-2010
We present an overview of the main techniques for production and processing graphene related materials (GRMs), as well key characterization procedures. adopt a 'hands-on' approach, providing practical details procedures derived from literature authors' experience, in order to enable reader reproduce results.
Van der Waals single-layer materials are characterized by an inherent extremely low bending rigidity and therefore prone to nanoscale structural modifications due substrate interactions. Such interactions can induce excess charge concentration, conformational ripples, residual mechanical strain. In this work, we employed spatially resolved Raman photoluminescence (PL) images investigate strain doping inhomogeneities in a single layer exfoliated molybdenum disulphide crystal. We have found...
Thin membranes, such as monolayer graphene of monoatomic thickness, are bound to exhibit lateral buckling under uniaxial tensile loading that impairs its mechanical behaviour. In this work, we have developed an experimental device subject 2D materials controlled equibiaxial strain on supported beams can be flexed up or down the material either compression tension, respectively. Using gauges in tandem with Raman spectroscopy measurements, monitor G and phonon properties biaxial thus extract...
Two-dimensional materials such as graphene and molybdenum disulfide are often subject to out-of-plane deformation, but its influence on electronic nanomechanical properties remains poorly understood. These physical distortions modulate important which can be studied by atomic force microscopy Raman spectroscopic mapping. Herein, we have identified investigated different geometries of line defects in standing collapsed wrinkles, folded grain boundaries that exhibit distinct strain doping. In...
Strain engineering can modulate the properties of two-dimensional (2D) semiconductors for electronic and optoelectronic applications. Recent theory experiments have found that uniaxial tensile strain improve electron mobility monolayer MoS
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...
Chemical vapor deposited WS2 monolayers are subjected for the first time to controlled pure biaxial tensile strain up 0.7%. From photoluminescence (PL) spectroscopy, trion and neutral exciton deformation potentials found be similar, approximately −130 meV/%. It is shown that excess carrier concentration as well residual in samples can determined from PL spectra. The experimental Grüneisen parameter of in-plane E′ Raman mode 1L-WS2 equal corresponding (E2g) bulk WS2. impact mechanical on...
Multilayered graphitic materials are not suitable as load-bearers due to their inherent weak interlayer bonding (for example, graphite is a solid lubricant in certain applications). This situation largely improved when two-dimensional (2-D) such monolayer (SLG) graphene employed. The downside these cases the presence of thermally or mechanically induced wrinkles which ubiquitous 2-D materials. Here we set out examine effect extensive large wavelength/ amplitude wrinkling on stress transfer...
Abstract Single- and bi-layer MoS 2 are two-dimensional semiconductors able to withstand very large deformations before failure, standing out as suitable templates for strain engineering applications flexible electronics. It is imperative, the proper integration of this material in practical applications, that relationship between property well understood. Two dimensional crystals fabricated by chemical vapor deposition or micromechanical exfoliation transferred onto substrates subjected...
Experimental protocols based on Electron Paramagnetic Resonance (EPR) and Raman spectroscopy are presented for the investigation of Fe(II) spin transition in Cu(II)-doped 1-D spin-crossover (SCO) nanoparticles type [Fe1−xCux(NH2trz)3]Br2 where x = 0.03 0.06 NH2trz 4-amino-1, 2, 4-triazole. The resulting were characterized using Transmission Microscopy (TEM), Infrared (IR) spectroscopy, powder X-ray diffraction (p-XRD). Magnetic susceptibility measurements revealed a dependence scan rate,...
A controlled and eco-friendly, scalable CVD method for the production of single few layer MoS2 crystals is proposed.The are fabricated at atmospheric pressure through reaction pre-deposited sodium molybdate (Na2MoO4) in solution elemental sulfur 800 °C, offering flexibility to achieve two growth regimes -either homogeneously distributed or continuous films-by varying Na2MoO4 concentration.In particular, low precursor concentrations, isolated with controllable mean lateral size were...
High volume fraction carbon nanotube (CNT) composites (7.5-16% vol.) were fabricated by the impregnation of CNT buckypapers into epoxy resin. To enhance interfacial reaction with resin, CNTs modified two different treatments, namely, an epoxidation treatment and a chemical oxidation. The was found to result in length severance affect porosity buckypapers, having important impact on physico-mechanical properties nanocomposites. Overall, mechanical, electrical, thermal impregnated be superior...
Composite materials containing thin Shape Memory Alloy (SMA) wires show great promise as able to adapt their shape, thermal behaviour or vibrational properties during service. Tools for designing such are however far from being available. The work presented here reports the main achievements of a concerted European effort towards establishment fundamental understanding manufacturing and design SMA composites. following major steps examined: selection characterisation material constituents,...
The mechanical response of embedded ABA trilayer graphene flakes loaded in tension and compression on polymer beams is monitored by simultaneous Raman measurements through the strain sensitivity G or 2D peaks. A characteristic peculiarity investigated flake that it contains a bilayer part. Bernal stacked was used as sensor aiming to assess efficiency load transfer from matrix shear individual layers. For tension, both peaks are redshifted splitting peak reported for first time. In...
Monolayer transition metal dichalcogenides are intensely explored as active materials in 2D material-based devices due to their potential overcome device size limitations, sub-nanometric thickness, and robust mechanical properties. Considering large band gap sensitivity strain, single-layered TMDs well-suited for strain-engineered devices. While the impact of various types strain on properties a variety has been studied past, TMD-based have rarely under deformations, with uniaxial being most...
Surface-Enhanced Raman Spectroscopy (SERS) is a powerful, non-destructive technique for enhancing molecular spectra, first discovered in 1974. This study investigates the enhancement of signals from single- and few-layer molybdenum disulfide (MoS2) when interacting with silver nanoparticles. We synthesized MoS2 membrane primarily consisting monolayers bilayers through wet chemical vapor deposition method using metal salts. The nanoparticles were either directly grown on or placed beneath it....
Buckypapers are thin sheets of randomly entangled carbon nanotubes, which highly porous networks. They strong candidates for a number applications, such as reinforcing materials composites. In this work, buckypapers were produced from multiwall pre-treated by two different chemical processes, either an oxidation or epoxidation reaction. Properties, porosity, the mechanical and electrical response investigated. It was found that pretreatment nanotubes strongly affects structural properties...