Capacitive neural interface provides a safer way to record the neural activity with reduced risk of current leakage and improved biocompatibility. The emerging of soft neural interfaces makes it necessary to propose dielectric coating with excellent flexibility and dielectric property for the soft capacitive neural interface. In this study, the feasibility and strategy of using the ferroelectric ceramic/elastomer composite as the dielectric coating in soft capacitive neural interface are discussed. With excellent electrical isolation performance, the device experimentally demonstrates the abilities to record in vivo electrocorticogram signal with comparable quality to the commercial electrode and steady-state visual evoked potential signal with improved signal-to-noise ratio. The roles of the ceramic particles in the performance of soft capacitive neural interface are discussed by evaluating the influences of composite content on not only the permittivity but the wettability and stiffness of the dielectric coating, providing the understanding for using the elastomer-based composite as the dielectric coating of the soft capacitive neural interface in a broader view.

电容式神经接口提供了一种更安全的方式来记录神经活动，从而降低了电流泄漏的风险并提高了生物相容性。软神经接口的出现使得有必要为软电容神经接口提出一种具有出色柔韧性和介电性能的电介质涂层。在这项研究中，讨论了在软电容神经界面中使用铁电陶瓷/弹性体复合材料作为介电涂层的可行性和策略。该设备具有出色的电隔离性能，通过实验证明了其能够以与商用电极相媲美的质量记录体内脑电图信号和具有改善的信噪比的稳态视觉诱发电位信号的能力。