RO – Page 2 – TechConnect Briefs

Colloidal magnetite nanoparticles– cytotoxicity study on V79 lung fibroblast cells

Mihai C.T., Puscasu E., Secarescu L., Nadejde C., Gherghel D., Creanga D., Vochita G., Alexandru Ioan Cuza University, RO

Various bioeffects of nanoparticulate matter were reported in the last decades. Herein, we present colloidal magnetic nanoparticles (MNPs), yielded by chemical route, tested for cytotoxicty with focus on cell apoptosis and DNA fragmentation. Chinese hamster [...]

The C-TVA plasma source – a chemical vacuum thin film deposition tool

Surdu-Bob C.C., Badulescu M., INFLPR, RO

It is presented here for the first time the deposition of oxides, nitrides and oxinitride thin films by a new plasma source based on Thermionic Vacuum Arc plasma (TVA), called Compact-TVA (C-TVA). The source uses [...]

Single resonator GaN/Si SAW based temperature sensor

Muller A., Konstantinidis G., Dinescu A., Stefanescu A., Cismaru A., Buiculescu V., Giangu I., Stavrinidis A., Stavrinidis G., Stavrinidis A., Stavrinidis G., IMT-Bucharest, RO

The use of GaN based SAW type sensors has a major advantage for temperature measurements in GaN MMICs because of the possibility of monolithic integration of the temperature sensor and the possibility to place the [...]

Characterization of RF-sputtered ultra-thin WO3 films grown on TiO2 surface

Dobromir M., Manole A., Apetrei R., Luca D., Alexandru Ioan Cuza University, RO

We report on TiO2 and WO3/TiO2 bilayers thin films grown on amorphous and crystalline substrates, at room temperature by plasma-assisted sputtering. TiO2/WO3 ceramic targets were used in an RF magnetron discharge running in an Ar [...]

Nanoscale fast Ge diffusion in laser irradiated SiGe thin films

Teodorescu V.S., Ghica C., Maraloiu A.V., Lepadatu A.M., Stavarache I., Ciurea M.L., Scarisoreanu N.D., Andrei A., Dinescu M., National Institute for Materials Physics, RO

We report the presence of a fast Ge diffusion effect produced during laser crystallization of Si0.45Ge0.55 films deposited by magnetron sputtering on Si(100) substrates. The laser irradiation was performed using the 265 nm wavelength radiation [...]

New Electrochemical Sensors Based on Clay and Carbon Micro and Nanoparticles for Pharmaceutical and Environmental Analysis

Maghear A., Cernat A., Cristea C., Marian A., Marian I.O., Marian A., Marian I.O., Săndulescu R., Iuliu Hatieganu University of Medicine and Pharmacy, RO

New composite materials based on clay micro and nanoparticles, MWCNTs and polymeric films for the development of electrochemical sensors and biosensors have been realized. Particle size separation of two Romanian bentonites from Răzoare and Valea [...]

The magnetic properties optimization in diluted magnetic oxide semiconductor nanoparticles obtained by a modified co-precipitation approach in intrazeolitic networks

Bosinceanu R., Iacomi F., Al.I.Cuza, RO

Ferromagnetism in diluted magnetic semiconductors (DMS) has been a subject of great scientific and technological interest for the past few years due to its implications for spintronics, advanced magneto-optics and sensors applications. Our research involves [...]

Cobalt doped ZnO prepared by electrochemistry: chemistry, morphology, and magnetism

Enculescu I., Matei E., Vasilache V., Teodorescu C.-M., National Institute of Materials Physics, RO

Pure and cobalt-doped ZnO films were electrodeposited from zinc and cobalt nitrate aqueous solutions on platinum substrates and investigated by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and magneto-optical Kerr effect (MOKE). X-ray photoelectron [...]

Fabrication and characterization of nano-structured ferromagnetic Ti1-xFexO2 thin films

Apetrei R., Negrila C., Macovei D., Dascaleanu V., Teodorescu C.-M., Luca D., Alexandru Ioan Cuza University, RO

Ti1-xFexO2, 300 nm thin films with x ranging between 0.0 and 0.6, have been fabricated by RF magnetron sputtering. Specimen characterization was done by XPS, AFM, XRD,UV-Vis spectrometry, MOKE, and XANES/EXAFS techniques. The AFM and [...]

Pulsed laser co-deposition of titania with Fe: chemistry, local atomic structure, and light-dependent magnetic properties

Negrila C., Logofatu C., Socol G., Macovei D., Teodorescu C.-M., National Institute of Materials Physics, RO

Transition metal doped titania has been revealed as a promising diluted magnetic semiconductor. We report the synthesis of TiO2:Fe and of mixed Ti and Fe oxides by pulsed laser deposition. The obtained layers were analyzed [...]