Development of Paste-free Brain Wave Electrode using Nanocarbon

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Conventional brain wave electrodes are made from Ag/AgCl. Ag/AgCl disk electrodes block X-ray and cause white lines to radiate out from the electrode in an X-ray computed tomography (CT) image. We therefore developed new brain wave electrodes using multi-wall carbon nanotube-dispersed PMMA thin film that can detect an Electroencephalogram (EEG) without radiological shadow of the electrode. It is found that the detection sensitivity of the multi-wall carbon nanotube-dispersed electrode was greater than that of Ag/AgCl disk electrodes. Thus, concurrent use of X-ray CT, MRI and brain wave electrode is possible.Volume resistivity of MWNT-dispersed PMMA thin film is higher than that of Ag/AgCl disk electrode, but brain wave was obtained clearly using its thin film electrode. This mechanism was elucidated. On the other hand, we developed new paste-free brain wave electrodes using multi-wall carbon nanotube-dispersed PMMA thin film.