Fully Printed μ-Needle Electrode Array from Conductive Polymer Ink for Bioelectronic Applications
| Autor: | Dirk Mayer, Korkut Terkan, Bernhard Wolfrum, Nouran Adly, Leroy Grob, Sabine Zips, L Weiß, Philipp Rinklin |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Polymers 02 engineering and technology 010402 general chemistry 01 natural sciences Mice PEDOT:PSS Electrochemistry Animals General Materials Science Conductive polymer Bioelectronics business.industry Nanotubes Carbon Electric Conductivity 021001 nanoscience & nanotechnology Bridged Bicyclo Compounds Heterocyclic 0104 chemical sciences Dielectric spectroscopy Microelectrode Needles Printed electronics Electrode Optoelectronics Polystyrenes Ink Cyclic voltammetry Electronics 0210 nano-technology business Microelectrodes |
| Zdroj: | ACS applied materialsinterfaces. 11(36) |
| ISSN: | 1944-8252 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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