Novel dry polymer foam electrodes for long-term EEG measurement

Chin Teng Lin*, Lun De Liao, Yu Hang Liu, I. Jan Wang, Bor-Shyh Lin, Jyh Yeong Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

279 Scopus citations


A novel dry foam-based electrode for long-term EEG measurement was proposed in this study. In general, the conventional wet electrodes are most frequently used for EEG measurement. However, they require skin preparation and conduction gels to reduce the skinelectrode contact impedance. The aforementioned procedures when wet electrodes were used usually make trouble to users easily. In order to overcome the aforesaid issues, a novel dry foam electrode, fabricated by electrically conductive polymer foam covered by a conductive fabric, was proposed. By using conductive fabric, which provides partly polarizable electric characteristic, our dry foam electrode exhibits both polarization and conductivity, and can be used to measure biopotentials without skin preparation and conduction gel. In addition, the foam substrate of our dry electrode allows a high geometric conformity between the electrode and irregular scalp surface to maintain low skinelectrode interface impedance, even under motion. The experimental results presented that the dry foam electrode performs better for long-term EEG measurement, and is practicable for daily life applications.

Original languageEnglish
Article number5676186
Pages (from-to)1200-1207
Number of pages8
JournalIEEE Transactions on Biomedical Engineering
Issue number5
StatePublished - 1 May 2011


  • Biopotentials
  • conduction gel
  • dry electrode
  • electroencephalography
  • skinelectrode interfaces impedance


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