Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 158, Issue 1, Pages 176-184Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.05.062
Keywords
Polypyrrole; Graphene oxide; Electrochemical deposition; Neural electrode
Funding
- National Natural Science Foundation of China [50990063, 50973095, 51011130028]
- Zhejiang Provincial National Science Foundation of China [R4110030]
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By exploiting the electrostatic interaction between positively charged pyrrole cation radicals and negatively charged graphene oxide (GO) sheets, we prepared polypyrrole/graphene oxide (PPy/GO) composite films by a one-step electrochemical process. We studied the effects of the polymerization current density and the GO content in electrolyte on the formation of PPy/GO coatings onto platinum neural micro-electrode sites. As compared with pure PPy film, PPy/GO coatings show a rougher surface feature with micrometer-scale bulges. The impedance of the PPy/GO coated Pt electrode is only about 10% of the bare Pt electrode at the biological relevant 1 kHz, while the charge capacity density is more than two orders of the magnitude of the bare Pt electrode. Moreover, the PPy/GO coated Pt electrodes show higher performance than the PPy coated electrodes for the application of neural probe. (C) 2011 Elsevier B.V. All rights reserved.
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