TY - CHAP A1 - Körbitzer, Berit Silke A1 - Krauß, Peter A1 - Nick, Christoph A1 - Schneider, Jörg A1 - Thielemann, Christiane T1 - Graphene electrodes for recording and stimulation of neural cells T2 - ICREA Workshop on Graphene Nanobiosensors KW - Nervenzelle KW - Elektrostimulation Y1 - 2015 CY - Barcelona, Spanien ER - TY - JOUR A1 - Körbitzer, Berit Silke A1 - Krauß, Peter A1 - Belle, Stefan A1 - Schneider, Jörg A1 - Thielemann, Christiane T1 - Electrochemical Characterization of Graphene Microelectrodes for Biological Applications JF - ChemNanoMat N2 - Graphene is a promising material both as a coating for existing neural electrodes as well as for transparent electrodes made exclusively from graphene. We studied graphene‐based microelectrodes by investigating their recording and stimulation properties in order to evaluate their suitability for neuronal implants. In this work, we compare three different electrode material compositions. Microelectrode arrays (MEA) with an electrode size of about 700 μm2 were prepared of gold, graphene on gold, and plain graphene on glass substrate. In order to reduce polymer contamination during graphene transfer, we employed a polymer‐free transfer and lift‐off process. Impedance studies revealed a value of 2.3 MΩ at 1 kHz for plain, and 0.88 MΩ for graphene on gold. Neuronal recording experiments showed a sufficient SNR for both graphene‐based materials and a stable impedance, unaffected by surface degradation metal electrodes are known for. Stimulation measurements yielded a charge injection capacity of 0.15 mC/cm2 using biphasic pulses of 1 ms and 1 μA transparent graphene electrodes. Cyclic voltammetry revealed a large voltage range of −1.4 V to +1.6 V before water electrolysis occurs. Graphene‐coated gold microelectrodes show enhanced recording properties, whereas plain graphene electrodes might be better suited for stimulation applications. KW - Graphene KW - Microelectrodes KW - Stimulation KW - Neural Recording KW - Neural Interface KW - Mikroelektrode KW - Array Y1 - 2019 U6 - https://doi.org/10.1002/cnma.201800652 VL - 2019 IS - 5:4 SP - 427 EP - 435 ER - TY - CHAP A1 - Körbitzer, Berit Silke A1 - Krauß, Peter A1 - Schneider, Jörg A1 - Thielemann, Christiane T1 - Characterization Of Graphene-Coated Microelectrode Arrays For Recording And Stimulation Of Neuronal Cells T2 - Frontiers KW - Mikroelektrode KW - Array KW - Nervenstimulation Y1 - 2016 U6 - https://doi.org/10.3389/conf.fnins.2016.93.00013 VL - 2016 IS - MEA Meeting 2016 ER - TY - THES A1 - Körbitzer, Berit Silke T1 - Untersuchung funktioneller Schnittstellen zwischen Graphen und neuronalen Zellen KW - Mikroelektrode KW - Array KW - Graphen KW - Elektrode Y1 - 2019 U6 - https://doi.org/10.25534/tuprints-00011462 ER -