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Study of vanadium doped ZnO films prepared by dc reactive magnetron sputtering ...
Meng Lijian; Teixeira, Vasco M. P.; Santos, M. P. dosZnO films doped with vanadium (ZnO:V) have been prepared by dc reactive magnetron sputtering technique at different substrate temperatures (RT–500 C). The effects of the substrate temperature on ZnO:V films properties have been studied. XRD measurements show that only ZnO polycrystalline structure has been obtained, no V2O5 or VO2 crystal phase can be observed. It has been found that the film prepared at low s...
Utilização de nanopartículas de TIO2 para o desenvolvimento de pavimentos rodov...
Carneiro, Joaquim A. O.; Freitas, Elisabete F.; Teixeira, Vasco M. P.; Fernandes, Filipa; Silva, Hugo Manuel Ribeiro Dias da; Oliveira, Joel; Nunes, C.A utilização de nanomateriais na indústria de construção rodoviária representa uma opção estrategicamente inovadora que visa a modificação dos materiais convencionais. Neste âmbito, dotar a superfície dos pavimentos rodoviários de capacidade fotocatalítica contribuirá para efetuar a despoluição do ar e a redução da sujidade adsorvida nestas superfícies, aumentando a segurança rodoviária uma vez que minimiza a p...
Platinum nanoparticles as pH sensor for intelligent packaging
Coutinho, Paulo J. G.; Benelmekki, M.; Teixeira, Vasco M. P.; Martins, Ana JoãoPt nanoparticles were produced by reverse micelle templating using DTAB. The resulting nanoparticles showes sizes between 250nm and 500nm and formed clusters. Thioglycolic acid (TGA) was covalently attached to the nanoparticle surface as a stabilizer and as. The Pt nanoparticles were dispersed in water and the dependence of its absorvance on the pH of the solution was studied. The spectra showed surface plamon ...
Utilização da nanotecnologia na preparação de misturas asfálticas com capacidad...
Carneiro, Joaquim A. O.; Fernandes, Filipa; Teixeira, Vasco M. P.; Nascimento, José Heriberto Oliveira do; Freitas, Elisabete F.; Pereira, Paulo A. A.Este artigo centra-se especificamente na utilização de nanomateriais (na forma de nanopartículas) para o desenvolvimento de “novas” misturas asfálticas no âmbito da pavimentação rodoviária. Para o efeito, misturas asfálticas convencionais foram modificadas através da utilização de nanopartículas de um semicondutor inorgânico (dióxido de titânio - TiO2) de modo a dotá-las de novas funcionalidades: capacidade fot...
Development of photocatalytic ceramic materials through the deposition of TiO2 ...
Carneiro, Joaquim A. O.; Teixeira, Vasco M. P.; Azevedo, Sofia; Fernandes, Filipa; Neves, JorgeUrbanism and communities centralization enlarges atmospheric pollution that affects both human beings as well as their constructed buildings. Different scientific and technological studies are being conducted, both in academic and construction industry, aiming the development of new construction materials with properties that can decrease visual pollution of cities, reducing also the number of cleanings require...
Deposition of ITO thin films onto PMMA substrates for waveguide based biosensin...
Azevedo, Sofia; Diéguez, L.; Carvalho, Pedro; Carneiro, Joaquim A. O.; Teixeira, Vasco M. P.; Martínez, E.; Samitier, J.Biosensors’ research filed has clearly been changing towards the production of multifunctional and innovative design concepts to address the needs related with sensitivity and selectivity of the devices. More recently, waveguide biosensors, that do not require any label procedure to detect biomolecules adsorbed on its surface, have been pointed out as one of the most promising technologies for the production of...
Nanoporous alumina templates : anodisation and mechanical characterisation
Samantilleke, A. P.; Carneiro, Joaquim A. O.; Alpuim, P.; Teixeira, Vasco M. P.; Thuy, Tran Thi ThuDue to applications in electronics, optoelectronics, energy storage, photocatalysis, photonics and biosensors/biomaterials, interest in onedimensional nanostructures has grown significantly during the last decade. The use of nanoporous templates as matrices for fabrication of nanostructures is now commonplace in microelectronics technology. Studies on semiconductors and dielectrics have introduced nanoporous an...
Pulsed DC reactive magnetron sputtering of vanadium dioxide thermochromic thin ...
Batista, C.; Teixeira, Vasco M. P.; Ribeiro, R. M.Vanadium oxides are an important class of materials with a large diversity of physical and chemical properties which derive from a range of single or mixed valences and a large variety of structures. They are already being used in many technological applications such as electrical and optical switching devices, light detectors, temperature sensors, etc. There has been a great interest in a particular phase, VO2...
Synthesis and characterization of VO2-based thermochromic thin films for energy...
Batista, C.; Ribeiro, R. M.; Teixeira, Vasco M. P.Thermochromic VO2 thin films have successfully been grown on SiO2-coated float glass by reactive DC and pulsed-DC magnetron sputtering. The influence of substitutional doping of V by higher valence cations, such as W, Mo, and Nb, and respective contents on the crystal structure of VO2 is evaluated. Moreover, the effectiveness of each dopant element on the reduction of the intrinsic transition temperature and in...
Photocatalytic activity and UV- protection of TiO2 nanocoatings on polylactic a...
Carneiro, Joaquim A. O.; Teixeira, Vasco M. P.; Nascimento, José Heriberto Oliveira do; Neves, J.; Tavares, P. B.The application of nanocoatings in the textile finishing is increasingly being explored because they open a whole new vista of value-addition possibilities in the textile sector. In the present work, low temperature pulsed DC magnetron sputtering method was used to create functional TiO2 nanocoatings on poly(lactic acid) textile fibres surfaces. In this study, the principal objectives in the application of TiO2...
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