The surface of boron-doped diamond (BDD) electrode has been modified by Nafion®. The polymer film was applied by solvent evaporation on BDD electrode surface. Nafion®-BDD electrode is used as a sensor for the detection of dopamine (DA) in acidic and neutral media. Favourable ionic interaction between the Nafion® film and DA enhances the current response compared to that at the bare electrode. In cyclic voltammetric measurements, Nafion®-BDD electrode can successfully separate the oxidation/reduction DA peaks in both media, but an evident increase in the response was obtained in acidic media. In preliminary experiments with differential-pulse voltammetry, the sensitivity of the Nafion®-BDD electrode for DA was higher and it permits the calculation of the range detection with this technique. The modified electrode exhibits a stable and sensitive response to DA. The results are described and discussed in the light of the existing literature.
Electrochemical behavior of dopamine at Nafion®-modified boron doped diamond electrode: preliminary results
MARTINEZ, Carlos Alberto;FERRO, Sergio;DE BATTISTI, Achille;
2007
Abstract
The surface of boron-doped diamond (BDD) electrode has been modified by Nafion®. The polymer film was applied by solvent evaporation on BDD electrode surface. Nafion®-BDD electrode is used as a sensor for the detection of dopamine (DA) in acidic and neutral media. Favourable ionic interaction between the Nafion® film and DA enhances the current response compared to that at the bare electrode. In cyclic voltammetric measurements, Nafion®-BDD electrode can successfully separate the oxidation/reduction DA peaks in both media, but an evident increase in the response was obtained in acidic media. In preliminary experiments with differential-pulse voltammetry, the sensitivity of the Nafion®-BDD electrode for DA was higher and it permits the calculation of the range detection with this technique. The modified electrode exhibits a stable and sensitive response to DA. The results are described and discussed in the light of the existing literature.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
