J Korean Med Sci.  2018 May;33(21):e154. 10.3346/jkms.2018.33.e154.

Electro-deposited Nanoporous Platinum Electrode for EEG Monitoring

• Kim DY
• Ku Y
• Ahn JW
• Kwon C
• Kim HC

• KMID: 2428949
• DOI: http://doi.org/10.3346/jkms.2018.33.e154

Abstract

BACKGROUND
One of the key issues in electroencephalogram (EEG) monitoring is accurate signal acquisition with less cumbersome electrodes. In this study, the L2 phase electro-deposited nanoporous platinum (L2-ePt) electrode is introduced, which is a new type of electrode that utilizes a stable nanoporous platinum surface to reduce the skin-electrode impedance.
METHODS
L2-ePt electrodes were fabricated using electro-deposition technique. Then, the effect of the nanoporous surface on the surface roughness and the electrode impedance were observed from the L2-ePt electrodes and the flat platinum (FlatPt) electrode. The skin-electrode impedances of the L2-ePt electrodes, a gold cup electrode, and the FlatPt electrode were evaluated when placed on the hairy occipital area of the head in ten subjects. For the validation of using the L2-ePt electrode, a correlational analysis of the alpha rhythms was performed in the same subjects for simultaneous EEG recordings using the L2-ePt and clinically-used EEG electrodes.
RESULTS
The results indicated that the L2-ePt electrode with a roughness factor of 200 had the lowest mean impedance performance. Moreover, the proposed L2-ePt electrode showed a significantly lower mean skin-electrode impedance than the FlatPt electrode. Finally, the EEG signal quality recorded by the L2-ePt electrode (r = 0.94) was comparable to that of the clinically-used gold cup electrode.
CONCLUSION
Based on these results, the proposed L2-ePt electrode is suitable for use in various high-quality EEG applications.

Keyword

Electroencephalogram; Nanoporous Pt; Skin-electrode Impedance; Alpha Rhythm

MeSH Terms

Alpha Rhythm
Electric Impedance
Electrodes*
Electroencephalography*
Head
Platinum*
Platinum