A novel one-step electrochemical codeposition of carbon nanotubes-DNA hybrids and tiron doped polypyrrole for selective and sensitive determination of dopamine

Li, Jing; Wei, Wanzhi; Luo, Shenglian

A novel one-step electrochemical codeposition of carbon nanotubes-DNA hybrids and tiron doped polypyrrole for selective and sensitive determination of dopamine

2010

Li, Jing | Wei, Wanzhi | Luo, Shenglian

We describe a novel sensor for dopamine. It is based on the use of polypyrrole doped with a carbon nanotube-DNA hybrid. The composite material can be used as a matrix for immobilizing doping anions such as tiron which assist in electrostatic repulsion of anions such as ascorbate and others. The sensor was used for highly selective and sensitive determination of dopamine. Parameters affecting the response were optimized. The sensor displays a wide dynamic range, a detection limit as low as 0.5 pM, high stability, and good reproducibility.

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