Extended Data Fig. 7: 1280-channel high-density electrical-recording fiber.
From: High-density soft bioelectronic fibres for multimodal sensing and stimulation
a, A photograph of the 2D film with the 1280 channels before rolling. i, A zoom-on image showing the 10-µm interconnects. ii, A zoom-on image showing the exposed recording area. b, A microscope image of the exposed site showing 10 recording electrodes. c-d, Microscope images showing the 230-µm fiber obtained after rolling. The length of the active recording area was 19.2 mm and the density (per unit length) is 66.7 mm−1 (compared to 9.6 mm and 133.33 mm−1 in NeuroPixles 2.0)22. e, Fiber cross-section showing the different rolled layers and the Au/PEDOT interconnects. Red lines in the inset mark some of the Au/PEDOT traces. f-g, SEM images of the 320-channel fiber. h, Impedance analysis of 32 channels showing a good yield after the transformation process.
