Electroencephalogram measurement using polymer-based dry microneedle electrode

Miyako Arai, Yuya Nishinaka, Norihisa Miki

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


In this paper, we report a successful electroencephalogram (EEG) measurement using polymer-based dry microneedle electrodes. The electrodes consist of needle-shaped substrates of SU-8, a silver film, and a nanoporous parylene protective film. Differently from conventional wet electrodes, microneedle electrodes do not require skin preparation and a conductive gel. SU-8 is superior as a structural material to poly(dimethylsiloxane) (PDMS; Dow Corning Toray Sylgard 184) in terms of hardness, which was used in our previous work, and facilitates the penetration of needles through the stratum corneum. SU-8 microneedles can be successfully inserted into the skin without breaking and could maintain a sufficiently low skin-electrode contact impedance for EEG measurement. The electrodes successfully measured EEG from the frontal pole, and the quality of acquired signals was verified to be as high as those obtained using commercially available wet electrodes without any skin preparation or a conductive gel. The electrodes are readily applicable to record brain activities for a long period with little stress involved in skin preparation to the users.

Original languageEnglish
Article number06FP14
JournalJapanese journal of applied physics
Issue number6
Publication statusPublished - 2015 Jun 1

ASJC Scopus subject areas

  • General Engineering
  • General Physics and Astronomy


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