7 documents found, page 1 of 1
The impact of physiological buffer solutions on zinc oxide nanostructures: zinc...
Rodrigues, J.; Pereira, S. O.; Zanoni, J.; Falcão, B. P.; Santos, N. F.; Moura, J. P.; Soares, M. R.; Rino, L.; Costa, F. M.; Monteiro, T.Zinc oxide (ZnO) nanostructures have been widely used in biosensor applications. However, little attention has been given to the interaction of ZnO structures with physiological buffer solutions. In the present work, it is shown that the use of buffers containing phosphate ions leads to the modification of the ZnO tetrapodal micro/nanostructures when immersed in such solutions for several hours, even at the phy...
Electrochemical and photoluminescence response of laser-induced graphene/electr...
Santos, N. F.; Rodrigues, J.; Pereira, S. O.; Fernandes, A. J. S.; Monteiro, T.; Costa, F. M.The inherent scalability, low production cost and mechanical flexibility of laser-induced graphene (LIG) combined with its high electrical conductivity, hierarchical porosity and large surface area are appealing characteristics for many applications. Still, other materials can be combined with LIG to provide added functionalities and enhanced performance. This work exploits the most adequate electrodeposition p...
Insights on luminescence quenching of ZnO tetrapods in the detection of hCG
Rodrigues, J.; Pereira, S. O.; Santos, N. F.; Rodrigues, C.; Costa, F. M.; Monteiro, T.Metal oxide semiconductors, and particularly zinc oxide (ZnO), are amongst the most investigated materials to be applied as transducer elements in biosensing devices due to properties as biochemical stability, biocompatibility and functionalisation simplicity. In the present work, ZnO nanotetrapods were produced by the laser-assisted flow deposition technique to be used as transducers in a photoluminescence (PL...
Heat Dissipation Interfaces Based on Vertically Aligned Diamond/Graphite Nanopl...
Santos, N. F.; Holz, T.; Santos, T.; Fernandes, A. J. S.; Vasconcelos, T. L.; Gouvea, C. P.; Archanjo, B. S.; Achete, C. A.; Silva, R. F.; Costa, F. M.Crystalline carbon-based materials are intrinsically chemically inert and good heat conductors, allowing their applications in a great variety of devices. A technological step forward in heat dissipators production can be given by tailoring the carbon phase microstructure, tuning the CV]) synthesis conditions. In this work, a rapid bottom-up synthesis of vertically aligned hybrid material comprising diamond thi...
Rare earth co-doping nitride layers for visible light
Rodrigues, J.; Miranda, S. M. C.; Santos, N. F.; Neves, A. J.; Alves, E.; Lorenz, K.; Monteiro, T.AlN and GaN films were co-implanted with europium and praseodymium ions followed by thermal annealing treatments for the lattice recovery and ions activation. Their structural and optical properties were studied by Rutherford Backscattering Spectrometry and optical spectroscopy techniques. The evolution of the ions photoluminescence intensity with temperature was analyzed for both AlN:Eu,Pr and GaN:Eu,Pr hosts,...
Optical properties of LFZ grown β-Ga2O3:Eu3+ fibres
Santos, N. F.; Rodrigues, J.; Fernandes, A. J. S.; Alves, L. C.; Alves, E.; Costa, F. M.; Monteiro, T.Due to their relevance for electronic and optoelectronic applications, transparent conductive oxides (TCO) have been extensively studied in the last decades. Among them, monoclinic β-Ga2O3 is well known by its large direct bandgap of ∼4.9 eV being considered a deep UV TCO suitable for operation in short wavelength optoelectronic devices. The wide bandgap of β-Ga2O3 is also appropriate for the incorporation of s...
Technical aspects for surface, structure and print characterization of coated p...
Velho, J.; Santos, N. F.; Conceição, S.; Ferreira, P. J.; Carvalho, M. G.; Ferreira, J. M.This paper focuses on the analysis of coated paper properties. The main subject of this paper is to find out ways to define and analyse coated paper properties, namely surface and structure, as well as, in a secondary position, printability. For that, several techniques were used: mercury intrusion porosimetry, scanning electron microscopy, atomic force microscopy and the technique of the contact angle measurem...