Han, Hyunjun Sim, Sangjun Kim, Chaesung Im, Maesoon Kim, Jongbaeg 2026-02-25T00:30:22Z 2026-02-25T00:30:22Z 2026-02-04 2025 2167-0013 https://pubs.kist.re.kr/handle/201004/154354 We developed the first carbon nanotube (CNT) -based three-dimensional (3D) microelectrode array (MEA) capable of penetrating retinal tissue and directly recording neural activities by integrating vertically-aligned carbon nanotubes (VACNTs) onto metal electrodes. Capillary-induced wetting densified the CNT strands, optimizing the microstructure for retinal tissue penetration. The VACNT microstructure effectively penetrated the retinal tissue surface, leveraging its stress-concentrating shape and high stiffness. Additionally, the fabricated 3D microelectrode showed remarkably low impedance (3.6 kΩ), utilizing a large specific surface area of VACNTs. The microelectrodes successfully recorded the spontaneous spiking activities of a retinal ganglion cell from an ex-vivo mouse retina. English IEEE THREE-DIMENSIONAL MICROELECTRODE ARRAY WITH VERTICALLY-ALIGNED CARBON NANOTUBES FOR RETINAL NEURAL SIGNAL RECORDING Conference 10.1109/TRANSDUCERS61432.2025.11109815 1 23rd International Conference on Solid State Sensors, Actuators and Microsystems-Transducers, pp.502 - 505 23rd International Conference on Solid State Sensors, Actuators and Microsystems-Transducers 502 505 US Orlando, FL 2025-06-29 2025 23RD INTERNATIONAL CONFERENCE ON SOLID-STATE SENSORS, ACTUATORS AND MICROSYSTEMS, TRANSDUCERS 001600364100126