Fig. 4: Long-term recording with nonpatterned nanovolcano arrays.

Evolution of the a APA, b recording duration, and c yield with two series of electroporations (four each) performed on successive days (VEP = 3 V). d Action potentials recorded by a single nanovolcano on subsequent days following multiple electroporations. The signals shown correspond to the data points highlighted in magenta in a and b. e Recording of spontaneous action potentials with an exceptionally high amplitude of ~62 mV on day 4 after the preparation underwent 8 electroporations