National Institute Of Materials Physics - Romania

Publications

5781 articles found

1851. Time delay and excitation mode induced tunable red/near-infrared to green emission ratio of Er doped BiOCl

Authors: Avram, D; Florea, M; Tiseanu, I; Tiseanu, C

Published: SEP 9 2015, , DOI: 10.1088/0022-3727/48/35/355501

1852. Deoxygenation of oleic acid: Influence of the synthesis route of Pd/mesoporous carbon nanocatalysts onto their activity and selectivity

Authors: Dragu, A; Kinayyigit, S; Garcia-Suarez, EJ; Florea, M; Stepan, E; Velea, S; Tanase, L; Colliere, V; Philippot, K; Granger, P; Parvulescu, VI

Published: SEP 5 2015, , DOI: 10.1016/j.apcata.2015.01.008

1853. Optical properties of Mn doped ZnO films and wires synthesized by thermal oxidation of ZnMn alloy

Authors: Sima, M; Mihut, L; Vasile, E; Sima, M; Logofatu, C

Published: SEP 1 2015, THIN SOLID FILMS, 590, 147, DOI: 10.1016/j.tsf.2015.07.072

Mn doped ZnO films and wires, having different manganese concentrations were synthesized by thermal oxidation of the corresponding ZnMn alloy films and wires electrodeposited on a gold substrate. Structural and optical properties were addressed with scanning electron microscopy, X-ray diffraction (XRD), Raman scattering and photoluminescence (PL). To estimate the manganese concentration in Mn doped ZnO films, X-ray photoelectron spectroscopy was used. XRD patterns indicate that the incorporation of Mn2+ ions into the Zn2+ site of ZnO lattice takes place. Quenching of the ZnO PL appears due to Mn2+ ions in the ZnO lattice. Moreover, a significant decrease in the green emission of ZnO is reported in the case of the Mn doped ZnO wire array with a Mn concentration of 1.45%. The wurtzite ZnO has a total of 12 phonon modes, namely, one longitudinal acoustic (LA), two transverse acoustic (TA), three longitudinal optical (LO), and six transverse optical branches. Compared to the undoped ZnO, a gradual up-shift of the Raman lines assigned to the 2LA and A(1) (LO) vibrational modes, from 482 and 567 cm(-1) to 532 and 580 cm(-1), respectively, takes place for the Mn doped ZnO films having a Mn concentration between 2 and 15%. Additionally, in the case of the Mn doped ZnO films with 7 and 15% Mn concentration, Raman spectra show the appearance and increase in the relative intensity of the ZnO Raman line assigned to the TA + LO vibrational mode in the 600-750 cm(-1) spectral range. For the Mn-doped ZnO wires, the presence of the Raman line peaking at 527 cm(-1) confirms the insertion of Mn2+ ions in ZnO lattice. (C) 2015 Elsevier B.V. All rights reserved.

1854. Heterogeneous Gold Catalyst: Synthesis, Characterization, and Application in 1,4-Addition of Boronic Acids to Enones

Authors: Moragues, A; Neatu, F; Parvulescu, VI; Marcos, MD; Amoros, P; Michelet, V

Published: SEP 2015, ACS CATALYSIS, 5, 5067, DOI: 10.1021/acscatal.5b01207

The new 1 wt % Au/TiO2-UVM-7 catalyst was prepared and fully characterized. This heterogeneous catalyst proved to be active, selective and recyclable for the unprecedented gold-catalyzed 1,4-addition of various functionalized arylboronic acids to 2-cyclohexen-1-one and other selected enones using toluene as a solvent. The gold-based catalyst was recycled two times and played an active role in this reaction, and the nature of the solvent determined a remarkable change in the products' selectivities.

1855. Physicochemical Characterization and In Vitro Cytotoxic Effect of 3-Hydroxyflavone in a Silver Nanoparticles Complex

Authors: Voicescu, M; Craciunescu, O; Moldovan, L; Anastasescu, M; Angelescu, DG; Teodorescu, VS

Published: SEP 2015, JOURNAL OF FLUORESCENCE, 25, 1223, DOI: 10.1007/s10895-015-1608-z

The aim of this work was to characterize the physico-chemical properties of 3-hydroxyflavone (3-HF) in a silver nanoparticles complex (SNPs) using UV-vis and Fluorescence spectroscopy, Atomic Force Microscopy (AFM) and Transmission Electron Microscopy (TEM) analysis. One also evaluated its effect on the cell viability and morphology of L929 mouse fibroblast cells in vitro. The contribution of the carrier protein, Bovine Serum Albumin (BSA) to 3-HF properties has also been investigated. 3-HF in BSA/SNPs systems presented no cytotoxic effect in L929 mouse fibroblast cells at any of the tested concentrations. The results are discussed with relevance to the oxidative stress process.

1856. Intense heavy ion beam-induced temperature effects in carbon-based stripper foils

Authors: Kupka, K; Tomut, M; Simon, P; Hubert, C; Romanenko, A; Lommel, B; Trautmann, C

Published: SEP 2015, JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, 305, 882, DOI: 10.1007/s10967-015-4057-x

At the future FAIR facility, reliably working solid carbon stripper foils are desired for providing intermediate charge states to SIS18. With the expected high beam intensities, the foils experience enhanced degradation and limited lifetime due to severe radiation damage, stress waves, and thermal effects. This work presents systematic measurements of the temperature of different carbon-based stripper foils (amorphous, diamond-like, and carbon-nanotube based) exposed to 4.8 MeV/u U, Bi, and Au beams of different pulse intensities. Thermal and spectroscopic analyses were performed by means of infrared thermography and Fourier transform infrared spectroscopy. The resulting temperature depends on the foil thickness and strongly increases with increasing pulse intensity and repetition rate.

1857. 1D-polyaniline starting from self-assembled systems

Authors: Donescu, D; Ghiurea, M; Spataru, CI; StIng, G; Anghel, D; Baibarac, M; Baltog, I

Published: SEP 2015, COLLOID AND POLYMER SCIENCE, 293, 2524, DOI: 10.1007/s00396-015-3645-1

The radical polymerization of aniline hydrochloride (ANIHCl) in the presence of ammonium persulfate was studied. 1D-Polyaniline (PANI) with fibrillar morphologies was obtained in the presence of anionic surfactants. The changes of the PANI-template structures in aqueous solution were studied using static fluorescence measurements. The dispersed PANI nanoparticles were characterized using dynamic light scattering, scanning electron microscopy (SEM), and Raman and Fourier transform infrared spectroscopies. The thermal analysis and the electrical conductivity of the dried samples were also performed. The fluorescence measurements indicated that nanocrystals of ANIHCl form in water complexes with the anionic surfactants at smaller concentrations than the critical micellar concentration. The same method revealed that other organic complexes with sulfonate groups do not induce an increase of the hydrophobic region due to short hydrocarbon tails. The SEM micrographs and Raman spectra revealed that the PANI nanofibers are compact and different compared to the nanoparticles prepared without surfactants.

1858. Luminescence properties of Eu3+-doped SiO2-LiYF4 glass-ceramic microrods

Authors: Secu, CE; Secu, M

Published: SEP 2015, OPTICAL MATERIALS, 47, 98, DOI: 10.1016/j.optmat.2015.07.009

Photoluminescence properties of the glass-ceramics microrods containing Eu3+-doped LiYF4 nanocrystals have been studied and characterized. Judd-Ofelt parameters and quantum efficiency has been computed from luminescence spectra and discussed by comparison to the glass ceramic bulk and pellet. The radiative decay rate A(rad) is higher in the glass ceramic rods (221 s(-1)) than in the glass ceramic bulk (130 s(-1)) but the quantum efficiency computed is very low (21%) compared to the glass-ceramic bulk (97%). There are effective non-radiative decay channels that might be related to an influence of the dimensional constraints imposed by the membrane pores during xerogel formation and subsequent glass ceramization. (C) 2015 Elsevier B.V. All rights reserved.

1859. Hetero-epitaxial growth of TiC films on MgO(001) at 100 degrees C by DC reactive magnetron sputtering

Authors: Braic, M; Zoita, NC; Danila, M; Grigorescu, CEA; Logofatu, C

Published: AUG 31 2015, THIN SOLID FILMS, 589, 596, DOI: 10.1016/j.tsf.2015.06.021

Hetero-epitaxial TiC thin films were deposited at 100 degrees C on MgO(001) by DC reactive magnetron sputtering in a mixture of Ar and CH4. The 62 nm thick films were analyzed for elemental composition and chemical bonding by Auger electron spectroscopy, X-ray photoelectron spectroscopy and micro-Raman spectroscopy. The crystallographic structure investigation by high resolution X-ray diffraction revealed that the films consist of two layers: an interface partially strained epilayer with high crystalline quality, and a relaxed layer, formed by columnar grains, maintaining the epitaxial relationship with the substrate. The films presented smooth surfaces (RMS roughness similar to 0.55 nm), with circular equi-sized grains/crystallites, as observed by atomic force microscopy. The Hall measurements in Van der Pauw geometry revealed relatively high resistivity value similar to 620 mu Omega cm, ascribed to electron scattering on interfaces, on grain boundaries and on different defects/dislocations. (C) 2015 Elsevier B.V. All rights reserved.

1860. Theoretical investigations of electronic structure and magnetism in Zr2CoSn full-Heusler compound

Authors: Birsan, A; Kuncser, V

Published: AUG 15 2015, JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 388, 4, DOI: 10.1016/j.jmmm.2015.04.007

The half-metallic properties of a new and promising full-Heusler compound, Zr2CoSn, are investigated by means of ab initio calculations within the Density Functional Theory framework. It was shown that the ferromagnetic ordered Hg2CuTi-type crystal structure is energetically the most favorable for this compound. The total magnetic moment is 3 mu(B)/f.u. and follows a typical Stater-Pauling dependence. The half metallicity disappears if the unit cell volume is contracted by more than 5%. 2015 Elsevier B.V. All rights reserved.