



@article {2216,
	title = {Novel TiN                    x-based biosignal electrodes for electroencephalography
},
	journal = {Measurement Science and TechnologyMeas. Sci. Technol.},
	volume = {22},
	year = {2011},
	note = {Cited By (since 1996): 1Export Date: 21 November 2012Source: ScopusArt. No.: 124007CODEN: MSTCEdoi: 10.1088/0957-0233/22/12/124007Language of Original Document: EnglishCorrespondence Address: Fiedler, P.; Institute of Biomedical Engineering and Informatics, Ilmenau University of Technology, Gustav-Kirchhoff-Str. 2, 98693 Ilmenau, Germany; email: patrique.fiedler@tu-ilmenau.deReferences: Teplan, M., Fundamentals of EEG measurement (2002) Meas. Sci. Rev., 2, p. 2. , 1-11;Fonseca, C., Silva Cunha, J.P., Martins, R.E., Ferreira, V.M., Marques De Sa, J.P., Barbosa, M.A., Martins Da Silva, A., A novel dry active electrode for EEG recording (2007) IEEE Transactions on Biomedical Engineering, 54 (1), pp. 162-165. , DOI 10.1109/TBME.2006.884649, 23; 
Cunha, L.T., Pedrosa, P., Tavares, C.J., Alves, E., Vaz, F., Fonseca, C., The role of composition, morphology and crystalline structure in the electrochemical behaviour of TiN x thin films for dry electrode sensor materials (2009) Electrochim. Acta, 55 (1), pp. 59-67; 
Dias, N.S., Carmo, A., Ferreira Da Silva, A., Mendes, P.M., Correia, J.H., New dry electrodes based on iridium oxide (IrO) for non-invasive biopotential recordings and stimulation (2010) Sensors Actuators, 164 (1-2), pp. 28-34; 
Green, R.A., Baek, S., Poole-Warren, L.A., Martens, P.J., Conducting polymer-hydrogels for medical electrode applications (2010) Sci. Technol. Adv. Mater., 11 (1), p. 014107; 
Harland, C.J., Clark, T.D., Prance, R.J., Remote detection of human electroencephalograms using ultrahigh input impedance electric potential sensors (2002) Appl. Phys. Lett., 81 (17), pp. 3284-3286; 
Von, E.N., Spinelli, E., Muravchik, C.H., Capacitive electrodes in electroencephalography (2006) Conf. Proc. IEEE Eng. Med. Biol. Soc., 1, pp. 1126-1129; 
Kingsley, S.A., Sriram, S., Pollick, A., Marsh, J., Photrode optical sensor for electrophysiological monitoring (2003) Aviat. Space Environ. Med., 74, pp. 1215-1216; 
Fernandes, M.S., Dias, N.S., Silva, A.F., Nunes, J.S., Lanceros-Mendez, S., Correia, J.H., Mendes, P.M., Hydrogel-based photonic sensor for a biopotential wearable recording system (2010) Biosens. Bioelectron., 26 (1), pp. 80-86; 
Searle, A., Kirkup, L., A direct comparison of wet, dry and insulating bioelectric recording electrodes (2000) Physiological Measurement, 21 (2), pp. 271-283. , DOI 10.1088/0967-3334/21/2/307, PII S0967333400090511; 
Merletti, R., The electrode-skin interface and optimal detection of bioelectric signals (2010) Physiol. Meas., 31; 
Piscanec, S., Ciacchi, L.C., Vesselli, E., Comelli, G., Sbaizero, O., Meriani, S., De Vita, A., Bioactivity of TiN-coated titanium implants (2004) Acta Mater., 52 (5), pp. 1237-1245; 
Vaz, F., Ferreira, J., Ribeiro, E., Rebouta, L., Lanceros-Mendez, S., Mendes, J.A., Alves, E., De Rijk, J., Influence of nitrogen content on the structural, mechanical and electrical properties of TiN thin films (2005) Surface and Coatings Technology, 191 (2-3), pp. 317-323. , DOI 10.1016/j.surfcoat.2004.01.033, PII S025789720400060X; 
Vaz, F., Machado, P., Rebouta, L., Cerqueira, P., Goudeau, Ph., Riviere, J.P., Alves, E., De Rijk, J., Mechanical characterization of reactively magnetron-sputtered TiN films (2003) Surface and Coatings Technology, 174-175, pp. 375-382. , DOI 10.1016/S0257-8972(03)00711-4; 
Klem, G.H., L{\"u}ders, H.O., Jasper, H.H., Elger, C., The ten-twenty electrode system of the International Federation. The International Federation of Clinical Neurophysiology (1999) Electroencephalogr. Clin. Neurophysiol. Suppl., 52, pp. 3-6; 
Huigen, E., Peper, A., Grimbergen, C.A., Investigation into the origin of the noise of surface electrodes (2002) Med. Biol. Eng. Comput., 40 (3), pp. 332-338; 
Scheer, H.J., Sander, T., Trahms, L., The influence of amplifier, interface and biological noise on signal quality in high-resolution EEG recordings (2006) Physiological Measurement, 27 (2), pp. 109-117. , DOI 10.1088/0967-3334/27/2/002, PII S0967333406050039; 
Mayorga Martinez, C.C., Madrid, R.E., Felice, C.J., Electrochemical and geometrical characterization of iridium oxide electrodes in stainless steel substrate (2008) Sensors Actuators, 133 (2), pp. 682-686; 
Haueisen, J., Leistritz, L., Susse, T., Curio, G., Witte, H., Identifying mutual information transfer in the brain with differential-algebraic modeling: Evidence for fast oscillatory coupling between cortical somatosensory areas 3b and 1 (2007) Neuroimage, 37 (1), pp. 130-135; 
Graichen, U., Witte, H., Haueisen, J., Analysis of induced components in electroencephalograms using a multiple correlation method (2009) Biomed. Eng. Online, 8
},
	month = {2011///},
	abstract = {A composition, structural, morphological and electrochemical study of two titanium nitride (TiN                        x) thin films, sample A and sample B, obtained by dc reactive sputtering on titanium substrates was carried out in this paper. In order to assess their applicability to be used as dry electrodes, several EEG signal acquisition tests were performed using the TiN
                        x electrodes and compared to signals acquired with conventional silver/silver-chloride (Ag/AgCl) electrodes. The two films displayed some compositional differences, as sample B was over-stoichiometric (x = 1.34, x = N/Ti atomic ratio) and sample A was close-stoichiometric (x = 0.94). XRD diffractograms showed that both samples developed a similar fcc crystalline structure (δ-TiN phase). XRD peak fitting showed that sample B (over-stoichiometric) has a more oriented structure (highly [1 1 1] textured), with larger grains. A columnar-type structure with pyramid-like shape at column{\textquoteright}s top was common to both TiN 
                        x films. This morphology, in addition to some columnar disaggregation, gives rise to a rather rough surface and porous structure. Electrochemical impedance spectroscopy results in artificial sweat showed that the electric properties of the samples remain unchanged, even after prolonged contact with sweat. The comparison of EEG signals, simultaneously recorded using the novel TiN
                        x electrodes and conventional Ag/AgCl electrodes, showed very similar results. The root mean square deviation, which was computed for different electrode-electrolyte combinations and signal sequences of 5 s, was in the range of 4.5-9.4 νV and 6.7-20.4 νV for samples A and B, respectively. An additional test with two sets of Ag/AgCl electrodes revealed similar results, thus indicating most of the signal differences are related to the spatial distance of the compared electrodes as well as environmental noise. Therefore, our results lead to the conclusion that the novel TiN
                        x electrodes show promising signal quality for application in EEG biosignal measurements. {\textcopyright} 2011 IOP Publishing Ltd.
},
	keywords = {bioelectric, biomedical electrodes, Chlorine compounds, dc magnetron sputtering, Electric properties, Electrochemical impedance spectroscopy, Electrochemical properties, Electrodes, electroencephalography, Electrophysiology, Signal processing, signals, Surface structure, Thin films, Tinning, Titanium, Titanium nitride, titanium nitride thin films},
	isbn = {09570233 (ISSN)},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-81555220994\&partnerID=40\&md5=477ac3097f66e1610ed5147be18c5c77},
	author = {Fiedler, P. and Cunha, L.T. and Pedrosa, P. and Brodkorb, S. and Fonseca, C. and Vaz, F. and Haueisen, J.}
}
