A dry electrophysiology electrode using CNT arrays

摘要

We describe the concept of a dry electrode sensor for biopotentialmeasurement applications (ENOBIO) designed to eliminate the noise andinconvenience associated to the use of electrolytic gel. ENOBIO usesnanotechnology to remove gel-related noise, as well as maintaining a goodcontact impedance to minimise interference noise. The contact surface of theelectrode will be covered with an array/forest of carbon nanotubes and willalso be tested with an Ag/AgCl coating to provide ionic-electronictransduction. The nanotubes are to penetrate the outer layers of the skin, theStratum Corneum, improving electrical contact. We discuss requirements, skinproperties, nanotube penetration and transduction, noise sources, prototypedesign logic and biocompatibility. A future paper will report test results.