Encontrados 16 documentos, a visualizar página 1 de 2
Pulsed laser deposition of semiconducting nanoparticles : optical emission spec...
Marques, L.; Ramos, Marta M. D.; Gomes, M. J. M.Memory devices that use seminconductor nanocrystals (NC) for charge storage began to receive considerable attention in recent years due to their excellent performance, high capacity of memory and miniaturization. In order to integrate these materials into devices, formation of NCs and oxide layers with controlled stoichiometry, dimensions and homogeneity are required. Pulsed laser deposition (PLD) techniques ar...
Optical emission spectroscopy study of pulsed laser deposition of semiconductin...
Marques, L.; Ramos, Marta M. D.; Gomes, M. J. M.Memory devices that use seminconductor nanocrystals (NC) for charge storage began to receive considerable attention in recent years due to their excellent performance, high capacity of memory and miniaturization. In order to integrate these materials into devices, formation of NCs and oxide layers with controlled stoichiometry, dimensions and homogeneity are required. The optimization of nanoparticle synthesis ...
Controlling the properties of layered self-organized Ge clusters in silica matrix
Pinto, S. R. C.; Roldan, M. A.; Buljan, Maja; Bernstorff, S.; Chahboun, A.; Barradas, N. P.; Alves, E.; Molina, S. I.; Ramos, Marta M. D.Comunicação em poster no simposio M - More than Moore: Novel materials approaches for functionalized Silicon based Microelectronics ; Si and Ge nanocrystals (NCs) embedded in a dielectric matrix, such as SiO2, have attracted great interest for many relevant technological applications. There are many studies about Ge NCs embedded in single layer of SiO2 [1]. However, there are only a few published results about...
Sheep whole body composition predicted by in vivo real time ultrasound measurem...
Silva, S.; Gomes, M.J.; Teixeira, A.; Guedes, C.M.; Santos, V.; Azevedo, J.M.T.; Dias-da-Silva, A.Accurate measurement of changes in body composition and in the energy content of live animals is crucial to understand the responses to the intake of nutrients. Despite the accuracy of the serial slaughter technique in determining body composition, it is very expensive and comparisons within an animal became impossible thus the need for an accurate method to predict body composition in the live animal is obviou...
Low-temperature fabrication of layered self organized ge clusters by RF-sputtering
Pinto, S. R. C.; Rolo, Anabela G.; Buljan, M.; Chahboun, A.; Bernstorff, S.; Barradas, N. P.; Alves, E.; Kashtiban, R. J.; Bangert, U.; Gomes, M. J. M.In this article, we present an investigation of (Ge + SiO2)/SiO2 multilayers deposited by magnetron sputtering and subsequently annealed at different temperatures. The structural properties were investigated by transmission electron microscopy, grazing incidence small angles X-ray scattering, Rutherford backscattering spectrometry, Raman, and X-ray photoelectron spectroscopies. We show a formation of self-assem...
A microscopy study of germanium nanoparticules produced by pulsed laser deposition
Martín-Sánchez, J.; Marques, L.; Pinto, S. R. C.; Vieira, E. M. F.; Rolo, Anabela G.; Chahboun, A.; Ramos, Marta M. D.; Gomes, M. J. M.Comunicação oral ; Semiconductor nanoparticles (NPs) are of great interest for multiple applications in the fields of photonics, optoelectronics, photovoltaics and biomedicine [1]. The ability to manage properly the size distribution and density in the fabrication process is of crucial relevance. In the literature, it can be found a large number of strategies for NPs production, including physical vapour depos...
Incorporation of CdS nonoparticles from colloidal solution into optically clear...
Boev, Victor I.; Soloviev, A.; Silva, C. J. R.; Gomes, M. J. M.Nanocomposite materials based on an organic-inorganic ureasilicate matrix with embedded CdS nanoparticles were produced and characterized by optical (UV/Vis), FTIR, secondary ion mass spectroscopy, inductively-coupled plasma optical emission and steady-state photoluminescence measurements. The ureasilicate precursor was obtained by the reaction between silicon alkoxyde modified by isocyanate groups and polyethy...
Estimation in vivo of the body and carcass chemical composition of growing lamb...
Silva, Severiano; Gomes, M.J.; Dias da Silva, Arnaldo Alves; Gil, L.F.; Azevedo, Jorge Manuel Teixeira deThe relationship between ultrasound measurements and empty body and carcass chemical composition was investigated. A 500-V real-time ultrasound with a 7.5-MHz probe combined with image analysis was used to make in vivo measurements to predict the empty body and carcass chemical composition of 31 female lambs of two genotypes, ranging in BW from 18.2 to 48.9 kg. Eleven ultrasound measurements of s.c. fat, muscle...
Synthesis and characterization of a sol-gel derived ureasilicate hybrid organic...
Boev, Victor I.; Silva, C. J. R.; Hungerford, Graham; Gomes, M. J. M.A hybrid organic-inorganic material filled with in situ generated inorganic particles has been synthesised by the homogeneous precipitation of CdS from aqueous solutions of Cd(NO3)2 and CH3CSNH2 . These highly transparent, homogeneous and flexible CdS doped xerogels were prepared by the sol-gel technique using, as precursors, organically modified silicon alkoxide (3-isocyanatepropyltriethoxysilane) and a di-ami...
Electrical and photoelectric properties of PZT 65/35 thin films deposited by so...
Boerasu, Iulian; Pintilie, Lucian; Pereira, A. Mário; Vasilevskiy, Mikhail; Gomes, M. J. M.Asymmetric metal–ferroelectric–metal (MFM) structures were manufactured by sol–gel deposition of a lead zirconate-titanate (PZT with Zr/Ti ratio 65/35) film on Pt-coated Si, with a Au top electrode. The average remnant polarization of 9 µC/cm2 and the coercive field of 39 kV/cm were obtained from the hysteresis loop measurements. A detailed analysis of the polarization–electric field (P–E), capacitance–voltage ...
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