Preparation and Electrochemical Characterization of a Carbon Ceramic Electrode Modified with Ferrocenecarboxylic Acid

Sensors

Tatiane Skeika²  Cristiane R. Zuconelli²  Sergio T. Fujiwara¹ 

[1] Department of Chemistry, CEDETEG—Universidade Estadual do Centro-Oeste, Rua Presidente Zacarias 875, Guarapuava, Brazil; E-Mail:;Department of Chemistry, Universidade Estadual Ponta Grossa, Avenida Carlos Cavalcanti 4748, Uvaranas, Ponta Grossa, Brazil; E-Mails:

关键词: carbon ceramic electrode;    ferrocene carboxylic acid;    dopamine;   

DOI  :  10.3390/s110201361

来源: mdpi

【 摘 要 】

The present paper describes the characterization of a carbon ceramic electrode modified with ferrocenecarboxylic acid (designated as CCE/Fc) by electrochemical techniques and its detection ability for dopamine. From cyclic voltammetric experiments, it was observed that the CCE/Fc presented a redox pair at E_pa = 405 mV and E_pc = 335 mV (ΔE = 70 mV), related to the ferrocene/ferrocenium process. Studies showed a considerably increase in the redox currents at the same oxidation potential of ferrocene (E_pa = 414 mV vs. Ag/AgCl) in the presence of dopamine (DA), differently from those observed when using only the unmodified CCE, in which the anodic peak increase was considerably lower. From SWV experiments, it was observed that the AA (ascorbic acid) oxidation at CCE/Fc occurred in a different potential than the DA oxidation (with a peak separation of approximately 200 mV). Moreover, CCE/Fc did not respond to different AA concentrations, indicating that it is possible to determine DA without the AA interference with this electrode.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.