30 documents found, page 1 of 3
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...
Electrochemical properties of oxygen-enriched carbon-based nanomaterials
Meirinho, S.G.; Ferraria, A. M.; do Rego, A. M. Botelho; Fernandes, A. J. S.; Viana, A. S.; Fernandes, J. C. S.; Oliveira, M. C.The introduction of oxygen moieties on a carbon-based material to enhance the electrode material activity for the oxygen reduction reaction (ORR) is a most unexplored experimental approach due to the risk of reducing the electron-transport ability of the electrode material. Herein, it is shown that carbon nanomaterials generated electrochemically from graphite can simultaneously show an anomalous high content o...
Biphasic apatite-carbon materials derived from pyrolysed fish bones for effecti...
Piccirillo, C.; Moreira, I. S.; Novais, R. M.; Fernandes, A. J. S.; Pullar, R. C.; Castro, P. M. L.Biphasic apatite-carbon biochar-type materials were prepared from pyrolysed cod fish bones and were assessed for the adsorption of persistent organic pollutants (pharmaceuticals diclofenac and fluoxetine), and heavy metals (Pb(II)). The materials, prepared with a simple pyrolysis process at different temperatures (200–1000 °C), were characterised with XRD, FTIR, Raman and SEM. Results showed that the pyrolysis ...
Surface modifications on as-grown boron doped CVD diamond films induced by the ...
Neto, M. A.; Pato, G.; Bundaleski, N.; Teodoro, O. M. N. D.; Fernandes, A. J. S.; Oliveira, F. J.; Silva, R. F.The surface termination of as-grown microcrystalline (MCD) and nanocrystalline (NCD) boron-doped diamond films was assessed by X-ray photoelectron spectroscopy (XPS) and water contact angle techniques. The diamond coatings were grown on mirror-polished silicon nitride ceramic substrates using the hot-filament chemical vapor deposition (HFCVD) technique. The boron doping source, boron oxide (B2O3) diluted in eth...
Diels–Alder functionalized carbon nanotubes for bone tissue engineering : in vi...
Mata, Diogo; Amaral, M.; Fernandes, A. J. S.; Colaço, B.; Gama, A.; Paiva, M. C.; Gomes, P. S.; Silva, R. F.; Fernandes, M. H.The risk-benefit balance for carbon nanotubes (CNTs) dictates their clinical fate. To take a step forward at this crossroad it is compulsory to modulate the CNT in vivo biocompatibility and biodegradability via e.g. chemical functionalization. CNT membranes were functionalised combining a Diels–Alder cycloaddition reaction to generate cyclohexene (–C6H10) followed by a mild oxidisation to yield carboxylic acid ...
Diels-Alder functionalized carbon nanotubes for bone tissue engineering: in vit...
Mata, D.; Amaral, M.; Fernandes, A. J. S.; Colaco, B.; Gama, A.; Paiva, M. C.; Gomes, P. S.; Silva, R. F.; Fernandes, M. H.The risk-benefit balance for carbon nanotubes (CNTs) dictates their clinical fate. To take a step forward at this crossroad it is compulsory to modulate the CNT in vivo biocompatibility and biodegradability via e.g. chemical functionalization. CNT membranes were functionalised combining a Diels-Alder cycloaddition reaction to generate cyclohexene (-C6H10) followed by a mild oxidisation to yield carboxylic acid ...
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...
High rate growth of nanocrystalline diamond films using high microwave power an...
Tang, C. J.; Fernandes, A. J. S.; Granada, Marco; Leitao, J. P.; Pereira, S.; Jiang, X. F.; Pinto, J. L.; Ye, H.In this work, we investigate the impact of minute amounts of pure nitrogen addition into conventional methane/hydrogen mixtures on the growth characteristics of nanocrystalline diamond (NCD) films by microwave plasma assisted chemical vapour deposition (MPCVD), under high power conditions. The NCD films were produced from a gas mixture of 4% CH4/H-2 with two different concentrations of N-2 additive and microwav...
Diels–Alder functionalized carbon nanotubes for bone tissue engineering: in vit...
Mata, D.; Amaral, M.; Fernandes, A. J. S.; Paiva, M. C.; Gomes, Pedro de Sousa; Silva, R. F.; Fernandes, M. H.; Gama, Adelina; Colaço, Bruno
Processing strategies for smart electroconductive carbon nanotube-based biocera...
Mata, D.; Oliveira, F. J.; Ferreira, N. M.; Araujo, R. F.; Fernandes, A. J. S.; Lopes, M. A.; Gomes, P. S.; Fernandes, M. H.; Silva, R. F.Electroconductive bone grafts have been designed to control bone regeneration. Contrary to polymeric matrices, the translation of the carbon nanotube (CNT) electroconductivity into oxide ceramics is challenging due to the CNT oxidation during sintering. Sintering strategies involving reactive-bed pressureless sintering (RB + P) and hot-pressing (HP) were optimized towards prevention of CNT oxidation in glass/hy...