Sensitive Dopamine Biosensor Based on Polypyrrole-Coated Palladium Silver Nanospherical Composites
2016
Mahmoudian, Mohammad Reza | Basirun, Wan Jeffrey | Binti Alias, Yatimah
We report a facile synthesis of polypyrrole-coated palladium silver nanospherical (PdAg NSPs-PPy) composites via direct reduction of Pd²⁺ and Ag⁺ in the presence of pyrrole monomers from an aqueous solution of Pd(CH₃COO)₂, AgNO₃, and NaOH. The nanocomposites were synthesized with different ratios of Pd and Ag (2:1, 1:1, and 1:2). X-ray diffraction shows that the Pd²⁺ and Ag⁺ were completely reduced to Pd and Ag, respectively, during the formation of PdAg NSPs-PPy. The modified glassy carbon electrode with the Pd₂Ag₁ NSPs-PPy demonstrated excellent electrochemical activity toward dopamine oxidation compared with the bare GCE, Pd₁Ag₁ NSPs-PPy, and Pd₁Ag₂ NSPs-PPy. From the differential pulse voltammetry results, the estimated limit of detection (S/N = 3) and limit of quantification (S/N = 10) for the linear segment (0.001–200 μM of dopamine) are 0.0258 and 0.0860 μM, respectively.
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