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38 results on '"SOCOL, G."'

1. Matrix assisted pulsed laser evaporation of Mn 12(Propionate) thin films

Author

Pervolaraki, Maria, Sima, Felix N., Socol, G., Teodorescu, C. M., Gheorghe, N. G., Socol, M., Mihailescu, Ion N., Moushi, Eleni E., Tasiopoulos, Anastasios J., Athanasopoulos, Georgios I., Viskadourakis, Zacharias A., Giapintzakis, Ioannis, Tasiopoulos, Anastasios J. [0000-0002-4804-3822], Giapintzakis, Ioannis [0000-0002-7277-2662], Viskadourakis, Zacharias A. [0000-0002-6793-3521], and Giapintzakis, John [0000-0002-7277-2662]

Subjects
Chemical compositions, Materials science, Magnetic behavior, Thin films, MAPLE, Decomposition temperature, Analytical chemistry, General Physics and Astronomy, Growth conditions, Fragile materials, Mn 12(Propionate), Deposition (phase transition), Single-molecule magnet, Thin film, Vapor-deposition techniques, Growth of thin films, Matrix assisted pulsed laser evaporation, chemistry.chemical_classification, Manganese, Single molecule magnets, Substrates, Potential applications, Surfaces and Interfaces, General Chemistry, Molecules, Condensed Matter Physics, Evaporation (deposition), Vapor deposition, Surfaces, Coatings and Films, Glass substrates, Carbon film, chemistry, Physical vapor deposition, Magnet, Bulk materials, Propionate, Magnets, Volatile fatty acids, Pulsed lasers
Abstract

Single molecule magnets are of great interest due to a multitude of potential applications for some of which thin films are required. Traditional physical vapor deposition techniques are not suitable for the deposition of these fragile materials with low decomposition temperatures. Matrix Assisted Pulsed Laser Evaporation technique has been employed for the growth of thin films of the single molecule magnet Mn 12(Propionate) on Si and glass substrates. In this paper we report on the appropriate growth conditions and also the morphology, chemical composition and magnetic behavior of the films. Continuous Mn 12(Propionate) films with properties similar to bulk materials have been obtained. © 2011 Elsevier B.V. 258 23 9471 9474 Cited By :1

Published
2012

2. Mn12 benzoate thin films on Si substrates fabricated by matrix assisted pulsed laser evaporation

Author

Pervolaraki, Maria, Athanasopoulos, Georgios I., Giapintzakis, Ioannis, Kizas, Christos M., Tasiopoulos, Anastasios J., Sima, Felix N., Socol, G., Mihailescu, Ion N., Tasiopoulos, Anastasios J. [0000-0002-4804-3822], and Giapintzakis, Ioannis [0000-0002-7277-2662]

Subjects
Single molecule magnets, Thin films, MAPLE, Mn12 benzoate
Abstract

We report on the successful implementation of Matrix Assisted Pulsed Laser Evaporation, to obtain films of the single molecule magnet Mn12 benzoate on Si substrates. The films have been characterized by optical microscopy, FTIR spectroscopy and extraction magnetometry. The results indicate that this deposition technique allows the fabrication of Mn12 benzoate films which are continuous and show magnetic properties similar to those of the parent molecular material. 12 3 557 560 Cited By :4

Published
2010

3. MAPLE deposited thin monomer films of maleimidic derivatives for photonics

Author

Stanculescu, A., Albu, A. -M, Socol, G., Florin Stanculescu, Socol, M., Preda, N., Rasoga, O., Girtan, M., Iulian, I., Laboratoire de Photonique d'Angers (LPHIA), and Université d'Angers (UA)

Subjects
[PHYS]Physics [physics]
Abstract

cited By 4; International audience; This paper presents a study of some thin monomer films deposited by MAPLE. These monomers have been synthesised from maleic anhydride and aniline derivatives and are characterized by a molecular structure adequate for the generation of optical non-linear phenomena. UV-VIS, FTIR, Raman and Photoluminescence spectroscopy have been used to investigate the influence of the experimental conditions on the properties of the films. X-Ray Diffraction has evidenced a certain degree of disorder in the thin films, which is correlated with the randomly orientated molecules and AFM images have revealed different roughness for different monomer layers and different substrates. Second harmonic measurements have shown a strong signal emitted by the thin film prepared from the monomer with one [-NH-NH-] donor and two [-NO2] acceptor groups. This thin film is characterized by good transparency and low photoluminescence emission at excitation with the wavelength of the second harmonic (λ~400 nm).

14. PULSED LASER DEPOSITION METHOD FOR FABRICATION OF CdS/TiO2 AND PbS PHOTOELECTRODES FOR SOLAR ENERGY APPLICATION

Author

Bjelajac, A., Djokic, V., Petrovic, R., George Stan, Socol, G., Popescu-Pelin, G., Mihailescu, I. N., and Janackovic, D.

Subjects
Photoelectrode, Pulsed laser deposition, Sputtering, Electron microscopy studies, Nanostructuring
Abstract

Titanium films sputtered on FTO glass were used for obtaining highly oriented titania nanotubes via anodization technique. Then, pulsed laser deposition of CdS was carried out for sensitizing of similar to 60 nm wide titania nanotubes by applying 50, 100, 150 or 200 subsequent laser pulses. Scanning electron microscopy was used to indicate which samples had the open nanotubular structure of titania preserved after the deposition of CdS. Energy dispersive spectroscopy showed that a higher number of applied laser pulses results in the increase of Cd and S quantity within samples. Pulsed laser deposition technique was also employed for the fabrication of PbS counter electrode. I-V characteristics of the photovoltaic cells consisting the obtained electrodes were measured and compared under one-sun illumination. The photovoltaic cell with photoanode sensitized with CdS by applying 150 laser pulses showed the highest current density and voltage among the investigated cell.

29. Heterostructures based on small molecules organic compounds

Author

Socol, M., Rasoga, O., Breazu, C., Socol, G., Preda, N., Pasuk, I., Visan, D., Ionel Stavarache, Gherendi, F., Girtan, M., Sidwaba, U., Laboratoire de Photonique d'Angers (LPHIA), and Université d'Angers (UA)

Subjects
[PHYS]Physics [physics]
Abstract

cited By 2; International audience; Heterostructures with layers from small molecules organic compounds were deposited on ITO/glass substrate by thermal vacuum evaporation (TVE) technique. Structural, optical and morphological investigations were carried out on the realised layers (zinc phthalocyanine-ZnPc, fullerene-C60 and 1,4,5,8-naphthalene-tetracarboxylic dianhydride-NTCDA). The films are polycrystalline keeping the morphological features characteristic to these materials. The prepared heterostructures reveal a large absorption domain in the visible domain. The current-voltage (I-V) characteristics of the investigated structures, recorded in dark, present an improvement in the current value (~ one order of magnitude) for the standard structure (ITO/PEDOT:PSS/ZnPc/C60/NTCDA/Al) with a supplimentary layer of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS). For the inverted structure (Al/NTCDA/C60/ZnPc/ITO) was also noticed an increased curent value in comparasion with that observed for the standard structure. © 2015, Inst Materials Physics. All rights reserved.

38. Biocompatible nanocrystalline octacalcium phosphate thin films obtained by pulsed laser deposition

Author

Adriana Bigi, Barbara Bracci, Jacques Werckmann, Gabriel Socol, Ion N. Mihailescu, Monica Iliescu, F. Miroiu, Paola Torricelli, Socol G., Torricelli P., Bracci B., Iliescu M., Miroiu F., Bigi A., Werckmann J., and Mihailescu I.N.

Subjects
Calcium Phosphates, DNA Replication, Materials science, Biophysics, Analytical chemistry, Bioengineering, Apoptosis, Biocompatible Materials, Substrate (electronics), Fluence, Pulsed laser deposition, Cell Line, Biomaterials, chemistry.chemical_compound, Mice, X-Ray Diffraction, Cell Adhesion, Animals, Humans, Nanotechnology, Thin film, Octacalcium phosphate, Deposition (law), Laser ablation, Lasers, Nanocrystalline material, chemistry, Mechanics of Materials, Ceramics and Composites, Cell Division
Abstract

We extended for the first time pulsed laser ablation to the deposition of octacalcium phosphate Ca8H2(PO4)6.5H2O (OCP) thin films. The depositions were performed with a pulsed UV laser source (lambda=248 nm, tau> or =20 ns) in a flux of hot water vapors. The targets were sintered from crystalline OCP powder and the laser ablation fluence was set at values of 1.5-2 J/cm2. During depositions the collectors, Si or Ti substrates, were maintained at a constant temperature within the range 20-200 degrees C. The resulting structures were submitted to heat treatment in hot water vapors for up to 6 h. The best results were obtained at a substrate temperature of 150 degrees C during both deposition and post-deposition treatment. High-resolution electron microscopy and XRD at grazing incidence indicated that the coatings obtained were made of nanocrystalline OCP. Cross-section TEM investigations showed that the coatings contained droplets stacked on Ti substrates as well as distributed across the entire thickness of the arborescence-like structure layers. The results of WST-1 assay, cell adherence, DNA replication, and caspase-1 activity confirmed the good biocompatibility of the coatings.

Published
2004

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