Project/scholarship details
- Project/scholarship ID
98943
- Reference
PTDC/FIS/098943/2008
- FundRef URI
- Funder
FCT - Fundação para a Ciência e a Tecnologia, I.P.
- Funder's country
Portugal
- Funding program
5876-PPCDTI
- Funding amount
185,000.00 €
- Start date
2010-05-04
- End date
2013-12-03
Documents
Mn-doped ZnO nanocrystals embedded in Al2O3: structural and electrical properties
Khodorov, Anatoli Anatolievich; Levichev, S.; Rolo, Anabela G.; Karzazi, O.; Chahboun, A.; Novak, J.; Vorobiev, A.; Tavares, C. J.; Eyidi, D.We report on the structural and electrical properties of Mn-doped ZnO/Al2O3 nanostructures produced by the pulsed laser deposition technique. Grazing incidence small angle x-ray scattering (GISAXS) and Rutherford backscattering spectrometry revealed the multilayered structure in as-deposited samples. Annealing of the nanostructures was shown to promote the formation of nanocrystals embedded in the Al2O3 matrix,...
Structural study of formation of Mn-Doped ZnO nanocrystals embedded in alumina ...
Levichev, Sergey Borisovitch; Khodorov, Anatoli Anatolievich; Karzazi, Ouiame; Vorobiev, Alexei; Chahboun, Adil; Konovalov, Oleg; Gomes, M. J. M.In this paper, the study of the formation of ZnMnO nanocrystals (NCs) embedded in an alumina matrix starting from ZnMnO/Al2O3 multilayers grown on a Si substrate by pulsed laser deposition with subsequent annealing is presented. The correlation between the morphology of grown NCs with the ratio R of the thickness of the ZnMnO layer to that of the Al2O3 layer in the as-grown multilayer structure was observed. Th...
Effect of bi-layer ratio in ZnO/Al2O3 multilayers on microstructure and functio...
Sekhar, K. C.; Levichev, S.; Buljan, M.; Bernstorff, S.; Kamakshi, Koppole; Chahboun, Adil; Almeida, A.; Moreira, J. A.; Pereira, Mário; Gomes, M. J. M.Zinc oxide (ZnO) nanocrystals (NCs) embedded in alumina (Al2O3) matrix were produced via rapid thermal annealing (RTA) of pulsed laser deposited ZnO/Al2O3 multilayered nanostructures. The effect of the thickness ratio (R) between Al2O3 and ZnO in one bi-layer on the microstructure and functional properties of NCs has been investigated. Grazing incidence small angle X-ray scattering confirmed the formation of na...
Tuning the surface plasmon resonance and surface-enhanced Raman scattering of p...
Kamakshi, Koppole; Sekhar, K. C.; Almeida, A.,; Moreira, J. A.; Gomes, M. J. M.Silver nanoparticle (AgNP) thin films were deposited by pulsed laser deposition onto glass substrates, at different fixed temperatures, under inert gas ambience and vacuum. Their morphology, surface plasmon resonance (SPR) and surfaceenhanced Raman scattering (SERS) activities were investigated. AFM analysis of the films showed the formation of densely packed nanoparticles of varying size and shape by changing ...
Ferroelectric phase transitions studies in 0.5Ba(Zr0.2Ti0.8) O3-0.5(Ba0.7Ca0.3)...
Silva, J. P. B.; Queirós, E. C.; Tavares, P. B.; Sekhar, K. C.; Kamakshi, Koppole; Moreira, J. A.; Almeida, A.; Pereira, Mário; Gomes, M. J. M.The ferroelectric phase transitions in 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 (BCZT 50/50) ceramics,fabricatedbyasolidstatereaction,werestudiedbyusing X-Ray diffraction, Raman spectroscopy, and measuring electric polarization, dielectric permittivity and pyroelectric current. Xraydiffraction(XRD)confirmsthecoexistenceoftetragonal(T) andrhombohedral(R)phasesatroomtemperature.Thetemperature dependence of the Ram...
Surface plasmon resonance-coupled photoluminescence and resistive switching beh...
Kamakshi, Koppole; Sekhar, K. C.; Almeida, A.,; Moreira, J. A.; Gomes, M. J. M.In this study, Ag:SiC nanocermets were prepared via rapid thermal annealing (RTA) of pulsed laser-deposited SiC/Ag/SiC trilayers grown on Si substrate. Atomic force microscope images show that silver nanoparticles (Ag NPs) are formed after RTA, and the size of NPs increases with increasing Ag deposition time (t Ag). Sharp dip observed in the reflectance spectra confirmed the existence of Ag surface plasmons (SP...
Effect of annealing temperature on photoluminescence and resistive switching ch...
Sekhar, K. C.; Kamakshi, Koppole; Bernstorff, S.; Gomes, M. J. M.This work demonstrates the role of defects generated during rapid thermal annealing of pulsed laser deposited ZnO/Al2O3 multilayer nanostructures in presence of vacuum at different temperatures (Ta) (500–900 C) on their electrical conductance and optical characteristics. Photoluminescence (PL) emissions show the stronger green emission at Ta 600 C and violet–blue emission at TaP800 C, and are attributed to oxyg...
Influence of substrate temperature on the properties of pulsed laser deposited ...
Kamakshi, Koppole; Silva, J. P. B.; Sekhar, K. C.; Marslin, Gregory; Moreira, J. Agostinho; Conde, O.; Almeida, A.; Pereira, Mário; Gomes, M. J. M.The effect of substrate temperature (Ts) on electrical conductance, surface plasmon resonance (SPR), and surface-enhanced Raman scattering (SERS) activity of silver nanoparticle (AgNP) thin films is presented. AgNP films are grown on glass substrates by pulsed laser deposition in a controlled Ar atmosphere at a pressure of 0.1 mbar and varying Ts. Different Ts results in different morphologies, as observed by s...
Substrate temperature effect on microstructure, optical and glucose sensing cha...
Kamakshi, Koppole; Silva, J. P. B.; Sekhar, K. C.; Moreira, J. Agostinho; Almeida, A.; Pereira, Mário; Gomes, M. J. M.This work reports the substrate temperatureinfluenced change in the structural, morphological, optical, and glucose sensing properties of silver (Ag) nanoparticles (NPs) deposited on p-type Si (100) wafers. AgNP films grown at temperatures ranging from RT to 600 °C clearly show a dependence of orientation texture and surface morphology on substrate temperature (Ts). As Ts increases from RT towards 600 °C, the p...
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