title: Development of α-polyoxometalate-polypyrrole-Au nanoparticles modified sensor applied for detection of folic acid.
abstract: In this work, electrochemically synthesized gold nanoparticles (AuNPs) and α-polyoxometalate (α-POM) (K7PMO2W9O39 · 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-α-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 (ks) of 1.15 × 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.
authors.affiliation: Department of Chemistry, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran; Department of Food Chemical Engineering, Kermanshah Science and Research Branch, Islamic Azad University, Kermanshah, Iran. Electronic address: arash.babakhanian@gmail.com.
authors.forename: Arash
authors.initials: A
authors.lastname: Babakhanian
authors.affiliation: Department of Food Chemical Engineering, Kermanshah Science and Research Branch, Islamic Azad University, Kermanshah, Iran.
authors.forename: Samineh
authors.initials: S
authors.lastname: Kaki
authors.affiliation: Department of Chemistry, Semnan University, Semnan, Iran; Department of Food Chemical Engineering, Kermanshah Science and Research Branch, Islamic Azad University, Kermanshah, Iran.
authors.forename: Mahtab
authors.initials: M
authors.lastname: Ahmadi
authors.affiliation: Department of Food Chemical Engineering, Kermanshah Science and Research Branch, Islamic Azad University, Kermanshah, Iran.
authors.forename: Hosna
authors.initials: H
authors.lastname: Ehzari
authors.affiliation: Department of Food Chemical Engineering, Kermanshah Science and Research Branch, Islamic Azad University, Kermanshah, Iran.
authors.forename: Afshin
authors.initials: A
authors.lastname: Pashabadi
mesh_terms: D003217:Conductometry / Q000295:instrumentation*; D058266:Dielectric Spectroscopy / Q000295:instrumentation*; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005492:Folic Acid / Q000032:analysis* / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D017973:Tungsten Compounds / Q000737:chemistry*; D000099294:Polyoxometalates
chemical_list: D005492:Folic Acid; D006046:Gold; D011108:Polymers; D011758:Pyrroles; D017973:Tungsten Compounds; C102296:polyoxometalate I; D000099294:Polyoxometalates; C067635:polypyrrole
keywords: Composite film electrode; Electrochemical impedance spectroscopy; Folic acid (vitamin B9); Polyoxometalate; Square-wave voltammetry