Abstract
A novel class of micro-electrodes was fabricated by synthesizing high density carbonnanotube islands on lithographically defined, passivated titanium nitride conductorson a silicon dioxide substrate. Electrochemical characterization in phosphatebuffered saline of these new electrodes reveals superb electrochemical propertiesmarked by featureless rectangular cyclic voltammetry curves corresponding to aDC surface specific capacitance and a volume specific capacitance as high as10 mF cm−2 and 10 F cm−3, respectively. These electrodes are also characterized by a slowly varying impedancemagnitude over the range of 1 Hz to 20 kHz. High fidelity extracellular recordings fromcultured neurons were performed and analysed to validate the effectiveness of thefabricated electrodes. The enhanced electrochemical properties of the electrodes,their flexible and simple micro-fabrication preparation procedure as well as theirbio-compatibility and durability suggest that carbon nanotube electrodes are apromising platform for high resolution capacitive electrochemical applications.
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