A Ferroelectric Ceramic/Polymer Composite-Based Capacitive Electrode Array for In Vivo Recordings

A new implantable capacitive electrode array for electrocorticography signal recording is developed with ferroelectric ceramic/polymer composite. This ultrathin and electrically safe capacitive electrode array is capable of attaching to the biological tissue conformably. The barium titanate/polyimide (BaTiO₃/PI) nanocomposite with high dielectric constant is successfully synthesized and employed as the ultrathin dielectric layer of the capacitive BaTiO₃/PI electrode array. The performance of the capacitive BaTiO₃/PI electrode array is evaluated by electrical characterization and 3D finite-element modeling. In vivo, neural experiments on the visual cortex of rats show the reliability of the capacitive BaTiO₃/PI electrode array. This work shows the potentials of capacitive BaTiO₃/PI electrode array in the field of brain/computer interfaces.

A new implantable capacitive electrode array for electrocorticography signal recording is developed with barium titanate/polyimide (BaTiO₃/PI) nanocomposite. This ultrathin and electrically safe capacitive BaTiO₃/PI electrode array is capable of attaching to the biological tissue conformably. In vivo neural experiments indicate its feasibility. This work shows the potentials of capacitive BaTiO₃/PI electrode arrays in the field of brain/computer interfaces.

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