Highly efficient nanoporous gold-modified multi-electrode arrays for in vitro extracellular recording and stimulation performance

摘要

Ag:Au alloy was electro-co-deposited on Au MEA followed by chemical etching of Ag to form porous Au structure. The impedance value of the nanoporous Au-modified MEA is 15.4 ± 0.55 kΩ at 1 kHz and the charge injection limit of the nanoporous Au-modified electrode is estimated to ca. 1 mC/cm2. The charge injection capability of the nanoporous Au-modified MEA was confirmed by observing stimulus-induced spikes at above 0.2 V.