Nanoplasmonics : The physics behind the applications

Optimization of nanocomposite Au/TiO 2 thin films towards LSPR optical-sensing

Metal nano-particles sizing by thermal annealing for the enhancement of surface plasmon effects in thin-film solar cells application

Influence of the surface properties on bactericidal and fungicidal activity of magnetron sputtered Ti–Ag and Nb–Ag thin films

This research was sponsored by the Portuguese Foundation for Science and Technology (FCT) in the framework of Strategic Funding UID/FIS/04650/2013; project POCI-01-0145-FEDER-016902, with FCT reference PTDC/FIS-NAN/1154/2014; and project POCI-01-0145-FEDER-032299, with FCT reference PTDC/FIS-MAC/32299/2017. This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, FCT Ref. UID/CTM/50011/2019, financed by national funds through the FCT/MCTES. Manuela Proenca acknowledges her PhD grant from FCT, with reference SFRH/BD/137076/2018. Joel Borges acknowledges FCT for his Post-Doc grant SFRH/BPD/117010/2016. Marco S Rodrigues acknowledges FCT for his PhD grant with reference SFRH/BD/118684/2016. Konstantin Romanyuk wish to thank the Portuguese FCT for the financial support (grant SFRH/BPD/88362/2012).

https://iopscience.iop.org/article/10.1088/1361-6528/ab068e/pdf

Nanoplasmonic response of porous Au-TiO2 thin films prepared by oblique angle deposition

https://repositorium.sdum.uminho.pt/bitstream/1822/39818/1/JBorges.pdf

Thin films composed of Ag nanoclusters dispersed in TiO2: Influence of composition and thermal annealing on the microstructure and physical responses

In this work, the thermal stability of TiAgx thin films, deposited by magnetron sputtering, was evaluated, envisaging their application in biomedical devices, namely as electrodes for biosignal acquisition. Based on the composition and microstructural characterization, a set of four representative TiAgx thin films was selected in order to infer whether they are thermally stable in terms of functional properties. In order to achieve this purpose, the structural and morphological evolution of the films with annealing temperature was correlated with their electrical, mechanical and thermal properties. Two distinct zones were identified and two samples from each zone were extensively analysed. In the first zone (zone I), Ti was the main component (Ti-rich zone) while in the second, zone II, the Ag content was more significant. The selected samples were annealed in vacuum at four different temperatures up to 500 °C. For the samples produced within zone I, small microstructural changes were observed due to the recrystallization of the Ti structure and grain size increment. Also, no significant changes were observed with annealing temperature regarding the films' functional properties, being thermally stable up to 500 °C. For higher Ag contents (zone II) the energy supplied by thermal treatments was sufficient to activate the crystallization of Ti–Ag intermetallic phases. A strong increase of the grain size of these phases was also reported. The structural and morphological organization proved to be determinant for the physical responses of the TiAgx system. The hardness and Young's modulus were significantly improved with the formation of the intermetallic phases. The silver addition and annealing treatments also played an important role in the electrical conductivity of the films, which was once again improved by the formation of Ti–Ag phases. The thermal diffusivity of the films was practically unchanged with the heat-treatment. This set of results shows that this intermetallic-like thin film system has good thermal stability up to high temperatures (as high as 500 °C), which in case of the highest Ag content zone is particularly evident for electrical and mechanical properties, showing an important improvement. Hardness increases about three times, while resistivity values become half of those from the lowest Ag content zone. These sets of characteristics are consistent with the targeted applications, namely in terms of biomedical sensing devices.

Evolution of the functional properties of titanium–silver thin films for biomedical applications: Influence of in-vacuum annealing

The influence of nitrogen and oxygen additions on the thermal characteristics of aluminium-based thin films

Nesse artigo, utilizou-se o Modulo Python Uncertainties no desenvolvimento dos codigos para efetuar os calculos de incertezas experimentais, tanto para a diferenca de potencial, quanto para as correntes eletricas. Para esse fim, foi desenvolvido um prototipo experimental que demonstra o efeito fotovoltaico a partir da utilizacao de materiais de baixo custo e, por conseguinte, com o objetivo de observar e quantificar as referidas grandezas fisicas envolvidas. Alem disso, foi realizada uma analise qualitativa e quantitativa do efeito fotovoltaico, assim como da Primeira Lei de Ohm. Nessa perspectiva, o prototipo foi associado a um multimetro, que permitiu a afericao direta da diferenca de potencial, cujo o valor principal foi de (0,4582 ± 0,0004) V, quando incidido um feixe laser em um fotodiodo presente em um transistor 2N3055, mas tambem os valores das correntes eletricas, sendo os valores principais de (81,7100 ± 0,1118) μA e (1,9990 ± 0,0320) μA, quando se utilizou dos resistores ohmicos de 1,0 kΩ e 220,0 kΩ, respectivamente. Por fim, e importante salientar que essa proposta de artigo objetiva a anexacao da computacao fisica no cotidiano escolar, assim como promover o despertar cientifico na confeccao de instrumentacoes especificas para o ensino-aprendizagem de fisica.

/pdf/uso-do-modulo-python-uncertainties-no-calculo-de-incertezas-4krg9ld2zg.pdf

F. M. Couto

Papers

Thin films composed of Ag nanoclusters dispersed in TiO2: Influence of composition and thermal annealing on the microstructure and physical responses

Evolution of the functional properties of titanium–silver thin films for biomedical applications: Influence of in-vacuum annealing

The influence of nitrogen and oxygen additions on the thermal characteristics of aluminium-based thin films

Uso do Módulo Python Uncertainties no cálculo de incertezas experimentais da diferença de potencial e corrente elétrica de um protótipo experimental