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11 results on '"Terkan, Korkut"'

1. Printing Technologies for Implantable Neural Interfaces

Author

Wolfrum, Bernhard (Prof. Dr.), Wolfrum, Bernhard (Prof. Dr.);Hemmert, Werner (Prof. Dr.), Terkan, Korkut, Wolfrum, Bernhard (Prof. Dr.), Wolfrum, Bernhard (Prof. Dr.);Hemmert, Werner (Prof. Dr.), and Terkan, Korkut

Abstract

In this work 2D and 3D printing technologies were used to investigate the rapid prototyping of implantable neural interfaces. Novel materials such as carbon nanotubes were used as the electrode material due to their superior electrochemical properties compared to conventional metallic implantable electrodes. An important aspect was to fabricate soft and stretchable interfaces showing a certain mechanical and electrochemical stability., In dieser Arbeit wurde mittels 2D- und 3D-Druckverfahren das Rapid Prototyping von implantierbaren neuronalen Schnittstellen untersucht. Neuartige Materialen wie Kohlenstoffnanoröhrchen wurden als Elektrodenmaterial verwendet aufgrund ihrer im Vergleich zu konventionellen metallischen Elektroden überlegenen elektrochemischen Eigenschaften. Ein wichtiger Aspekt was das Herstellen weicher und dehnbarer Schnittstellen, die eine bestimmte mechanische und elektrochemische Stabilität vorweisen.

Published
2023

10. Fully Printed μ-Needle Electrode Array from Conductive Polymer Ink for Bioelectronic Applications

Author

Zips, Sabine, Grob, Leroy, Rinklin, Philipp, Terkan, Korkut, Adly, Nouran Yehia, Weiß, Lennart Jakob Konstantin, Mayer, Dirk, and Wolfrum, Bernhard

Abstract

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–1is 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–1and 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.

Published
2024
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11. Direct Stereolithographic 3D Printing of Microfluidic Structures on Polymer Substrates for Printed Electronics.

Author

Zips, Sabine, Wenzel, Ole Jonas, Rinklin, Philipp, Grob, Leroy, Terkan, Korkut, Adly, Nouran Yehia, Weiß, Lennart, and Wolfrum, Bernhard

Subjects
PRINTED electronics, THREE-dimensional printing, POLYMER structure
Abstract

Both stereolithographic printing of microfluidics and inkjet printing of electronics are promising tools for the fabrication of lab‐on‐a‐chip devices. However, the combination of these two technologies has been a challenge so far, as the 3D‐printed components usually have to be bonded manually to the substrates functionalized with printed electronics. Here, a surface modification method is demonstrated for enabling the direct stereolithographic printing of microfluidic structures onto a variety of different substrates that are usually employed for printed electronics. The approach makes use of an acrylate‐terminated silane that covalently binds substrate and polymer network of the 3D print. The bonding strength is quantified and the compatibility of the concept with printed electrodes in a microfluidic channel is evaluated. A method for direct stereolithographic printing of microfluidics onto polymer substrates functionalized with printed electronics is demonstrated. The bonding strength is quantified for a variety of different substrates and the concept is evaluated with inkjet‐printed electrodes in a microfluidic channel. The method combines additive fabrication of microfluidics with printed electronics for rapid prototyping. [ABSTRACT FROM AUTHOR]

Published
2019
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