Project/scholarship details

  • Funder

    FCT - Fundação para a Ciência e a Tecnologia, I.P.

  • Funder's country

    Portugal

  • Funding program

    5876-PPCDTI

  • Funding amount

    82,925.00 €

  • Start date

    2012-04-02

  • End date

    2015-06-30

Documents

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Ag (y) :TiN (x) thin films for dry biopotential electrodes: the effect of compo...

Pedrosa, P.; Machado, D.; Borges, Joel Nuno Pinto; Rodrigues, M. S.; Alves, E.; Barradas, N. P.; Martin, N.; Evaristo, M.; Cavaleiro, A.; Fonseca, C.

In the present work, Agy:TiNx thin films, obtained by reactive DC magnetron sputtering, with decreasing [N]/[Ti] atomic ratios (from 1 to 0.1) and a fixed amount of Ag pellets placed in the erosion zone of a pure Ti target, were studied envisaging their application as biopotential electrodes. The strongly under-stoichiometric samples, [N]/[Ti] = 0.1 and 10 at.% Ag; [N]/[Ti] = 0.2 and 8 at.% Ag, were found to be...

Date: 2015   |   Origin: RepositóriUM - Universidade do Minho
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Development of polymer wicks for the fabrication of bio-medical sensors

Martins, Ana C.; Moreira, André; Machado, A. V.; Vaz, F.; Fonseca, Carlos; Nóbrega, J. M.

Polymer based wicking structures were fabricated by sintering powders of polycarbonate (PC), ultra-high molecular weight polyethylene and polyamide 12, aiming at selecting a suitable material for an innovative electroencephalography (EEG) bio-electrode. Preliminary experiments showed that PC based wicks displayed the best mechanical properties, therefore more detailed studies were carried out with PC to evaluat...

Date: 2015   |   Origin: RepositóriUM - Universidade do Minho
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Evolution of the functional properties of titanium–silver thin films for biomed...

Lopes, Cláudia Jesus Ribeiro; Gonçalves, C.; Borges, Joel Nuno Pinto; Polcar, T.; Rodrigues, M. S.; Barradas, N. P.; Alves, E.; Le Bourhis, E.

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...

Date: 2015   |   Origin: RepositóriUM - Universidade do Minho
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Electrochemical and structural characterization of nanocomposite Agy:TiNx thin ...

Pedrosa, Paulo Eduardo Teixeira Baptista; Machado, D.; Fiedler, P.; Alves, E.; Barradas, N. P.; Haueisen, J.; Vaz, F.; Fonseca, C.

Ag-y:TiNx nanocomposite thin films sputtered with different N/Ti atomic ratios and Ag atomic contents were characterized from the structural and morphological points of view. Their electrochemical behaviour was studied in a synthetic sweat solution, aiming at selecting a suitable material for biolectrode applications. An increase of the N/Ti atomic ratio, which is accompanied by an increase of the Ag atomic con...

Date: 2015   |   Origin: RepositóriUM - Universidade do Minho
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Ag:TiN-Coated Polyurethane for Dry Biopotential Electrodes: From Polymer Plasma...

Pedrosa, Paulo; Fiedler, Patrique; Lopes, Cláudia; Alves, Eduardo; Barradas, Nuno P.; Haueisen, Jens; Machado, A. V.; Fonseca, Carlos; Vaz, F.

Several plasma treatments using argon, oxygen, and nitrogen are studied in order to increase the interfacial adhesion of the polyurethane/Ag:TiN system to be used as biopotential electrodes. The optimized plasma treatments conditions (100 W, 15 min, regardless of the gas) promote a steep decrease of the water contact angle values. The observed chemical and topographic alterations translate into excellent polyur...

Date: 2016   |   Origin: RepositóriUM - Universidade do Minho
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Electrochemical characterization of nanostructured Ag:TiN thin films produced b...

Pedrosa, Paulo; Machado, Diogo; Fiedler, Patrique; Vasconcelos, Beatriz; Alves, Eduardo; Barradas, Nuno P.; Martin, Nicolas; Haueisen, Jens; Vaz, F.

Flexible polyurethane substrates were coated with Ag:TiN thin films (N/Ti atomic ratio = 0.7; 10 at.% Ag), with different column inclinations (α = 0°, 40° and 80°) and architectures (columnar, zigzag with 2 and 4 periods), using the Glancing Angle Deposition (GLAD) technique. The coatings were characterized in order to assess the best thin film architecture to suit the bio-potential electrode applications. An a...

Date: 2016   |   Origin: RepositóriUM - Universidade do Minho
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In-service characterization of a polymer wick-based quasi-dry electrode for rap...

Pedrosa, Paulo Eduardo Teixeira Baptista; Fiedler, Patrique; Pestana, Vanessa; Vasconcelos, Beatriz; Gaspar, Hugo; Amaral, Maria H.; Freitas, Diamantino

A novel quasi-dry electrode prototype, based on a polymer wick structure filled with a specially designed hydrating solution is proposed for electroencephalography (EEG) applications. The new electrode does not require the use of a conventional electrolyte paste to achieve a wet, low-impedance scalp contact. When compared to standard commercial Ag/AgCl sensors, the proposed wick electrodes exhibit similar elect...

Date: 2018   |   Origin: RepositóriUM - Universidade do Minho
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