%0 Journal Article
%A Zips, Sabine
%A Grob, Leroy
%A Rinklin, Philipp
%A Terkan, Korkut
%A Adly, Nouran Yehia
%A Weiß, Lennart Jakob Konstantin
%A Mayer, Dirk
%A Wolfrum, Bernhard
%T Fully Printed μ-Needle Electrode Array from Conductive Polymer Ink for Bioelectronic Applications
%J ACS applied materials & interfaces
%V 11
%N 36
%@ 1944-8252
%C Washington, DC
%I Soc.
%M FZJ-2019-04690
%P 32778 - 32786
%D 2019
%X Microelectrode arrays (MEAs) are widely used platforms in bioelectronics to study electrogenic cells. In recent years, the processing of conductive polymers for the fabrication of three-dimensional electrode arrays has gained increasing interest for the development of novel sensor designs. Here, additive manufacturing techniques are promising tools for the production of MEAs with three-dimensional electrodes. In this work, a facile additive manufacturing process for the fabrication of MEAs that feature needle-like electrode tips, so-called μ-needles, is presented. To this end, an aerosol-jet compatible PEDOT:PSS and multiwalled carbon nanotube composite ink with a conductivity of 323 ± 75 S m–1 is developed and used in a combined inkjet and aerosol-jet printing process to produce the μ-needle electrode features. The μ-needles are fabricated with a diameter of 10 ± 2 μm and a height of 33 ± 4 μm. They penetrate an inkjet-printed dielectric layer to a height of 12 ± 3 μm. After successful printing, the electrochemical properties of the devices are assessed via cyclic voltammetry and impedance spectroscopy. The μ-needles show a capacitance of 242 ± 70 nF at a scan rate of 5 mV s–1 and an impedance of 128 ± 22 kΩ at 1 kHz frequency. The stability of the μ-needle MEAs in aqueous electrolyte is demonstrated and the devices are used to record extracellular signals from cardiomyocyte-like HL-1 cells. This proof-of-principle experiment shows the μ-needle MEAs’ cell-culture compatibility and functional integrity to investigate electrophysiological signals from living cells.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:31424902
%U <Go to ISI:>//WOS:000486360500020
%R 10.1021/acsami.9b11774
%U https://juser.fz-juelich.de/record/865138