Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
740751 | Sensors and Actuators B: Chemical | 2011 | 9 Pages |
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 microelectrode 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.
► Polypyrrole and graphene oxide are electrochemically co-deposited. ► This composite is applied on neural microelectrodes. ► Impedance of the modified microelectrode is largely decreased. ► Charge capacity density is more than two orders of magnitude of the bare electrode. ► Higher performance of neural probe is anticipated.