Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 79: Graphene III: Electronic Properties
O 79.4: Vortrag
Donnerstag, 10. März 2016, 11:15–11:30, S053
Characterisation of Graphene Electrodes — •Markus Manz1, Martin Lottner1, Martin Stutzmann1, and Jose Garrido1,2 — 1Walter Schottky Institut, Technische Universität München, Garching, Germany — 2Catalan Institute of Nanoscience and Nanotechnology, Barcelona, Spain
The biocompatibility and flexibility of graphene devices allow for long-term in vivo detection of action potentials [1]. Thus, graphene has a serious advantage over former approaches [2] using other materials, which are rigid or brittle. Furthermore, the transparency of graphene micro electrodes allows for simultaneous optical stimulation/imaging and electrical recording [1]. While graphene has a high in plane conductivity, the out of plane conductivity of undoped single layer graphene (SLG) is rather low. This is a major drawback for the detection of neurotransmitters through their respective redox reactions. Therefore, various methods have been developed to increase the out of plane conductivity and 'activate' [3] the SLG electrodes. We investigated two methods of graphene 'activation', namely ozonization and doping with nitric acid. We characterized the modified electrodes using cyclic voltammetry, impedance spectroscopy, and Raman spectroscopy. We then compared the sensitivity of the untreated and 'activated' electrodes towards the neurotransmitters norepinephrine and dopamine.
[1] Kuzum, D. et al., Nat. Commun. 5:5259doi: 10.1038/ncomms6259 (2014). [2] Kwon, K. Y. et al. in Biomedical Circuits and Systems Conference (BioCAS), 2012 IEEE 164-167 (2012). [3] Kasry, A. et al., ACS Nano 4, 3839-3844 (2010).