Development of alpha-polyoxometalate-polypyrrole-Au nanoparticles modified sensor applied for detection of folic acid

作者：Babakhanian Arash^*; Kaki Samineh; Ahmadi Mahtab; Ehzari Hosna; Pashabadi Afshin

来源：Biosensors and Bioelectronics, 2014, 60: 185-190.

DOI：10.1016/j.bios.2014.03.058

• Square-wave voltammetry
• Polyoxometalate
• Composite film electrode
• Folic acid (vitamin B9)
• Electrochemical impedance spectroscopy

In this work, electrochemically synthesized gold nanoparticles (AuNPs) and alpha-polyoxometalate (alpha-POM) (K7PMO2W9O39 center dot H2O) were simultaneously doped into electropolymerized polypyrrole (PPy) film using the cyclic voltammetry (CV) technique. Scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and CVs were used to characterize the composite films. The PPy-alpha-POM-AuNPs modified gold (Au) electrode was used to determine folic acid (FA) using square-wave voltammetry (SWV). The modified electrode exhibited excellent electrocatalytic ability to the reduction of FA at 0.3 V (vs. SCE) with the electron transfer rate constant (k(s)) of 1.15 x 10(-19) s(-1). The common coexisting substances showed no interferences on the response of modified electrode to FA. The modified electrode indicated reproducible behavior and a high level stability during the experiments, making it particularly suitable for the analytical purposes.

• 出版日期2014-10-15