Simultaneous electrochemical determination of dopamine, uric acid and ascorbic acid using silver nanoparticles deposited on polypyrrole nanofibers

Abstract

Silver nanoparticles modified polypyrrole (PPy) nanofibers were fabricated and used for the simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA) with good selectivity and high sensitivity. Polypyrrole nanofibers were prepared through electrodeposition, while silver nanoparticles were deposited on PPy nanofiber by electrodeposition and electrochemical oxidation in situ. The morphology and structure of silver nanoparticles/polypyrrole nanocomposite (Ag/PPy) were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared (FT-IR). Compared with the bare glassy carbon electrode (GCE) and PPy/GCE, Ag/PPy modified GCE (AgPPy/GCE) exhibited much higher electrocatalytic activities toward oxidation of AA, DA, and UA with increasing the peak currents and decreasing the oxidation overpotentials. Cyclic voltammetry (CV) results showed that DA, AA, and UA could be detected selectively and sensitively at Ag-PPy/GCE with peak-to-peak separation of 120 mV and 170 mV for AA-DA and DA-UA, respectively. The calibration curves for AA, DA, and UAwere obtained in the range of 10-580 μM, 0.5-155 μM and 2-100 μM, respectively. The lowest detection limits (S/N= 3) were 1.8 μM, 0.1 μM, and 0.5 μM for AA, DA, and UA, respectively. With good selectivity and sensitivity, the present method was applied to determination of DA in injectable medicine and UA in urine sample.

Electrochemical application of cobalt nanoparticles-polypyrrole composite modified electrode for the determination of phoxim

“…The broad band around 1210 cm −1 was caused by the C–N stretching and = C–H in-plane deformation vibrations of the aromatic ring, while the two absorption peaks that appeared at 850 cm −1 and 620 cm −1 were due to C–H out-of-plane bending [ 25 , 26 ]. However, the FTIR spectrum of CoNPs/PPy shows the characteristics peaks of PPy, with a shift of peak positions toward lower wave number (1400 cm −1 to 1390 cm −1 and 1200 cm −1 to 1108 cm −1 ), indicating the dispersion of the electron density of PPy as a function of the incorporation of the nanoparticles [ 27 ].

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Phenol Formaldehyde Resole/Nanosilver Colloid Immobilized Polyester Textile Composite for Antibacterial Applications

“…The crystalline nature of Ag NPs has been determined by XRD analysis. Figure 6 [15] It is interesting to note that any peaks which may correspond to impurities are not detected in the entire spectrum. It also supports the observations from the EDAX analysis; reflecting the high purity of Ag NPs.…”

Modified Electrodes for Selective Voltammetric Detection of Biomolecules

“…form a nanocomposite of silver nanoparticles with electropolymerized pyrrole film to heighten the electrocatalytic activity of GCE. The resulting sensor showed the desirable characteristics (i. e. greater selectivity, superior electrical conductivity) . A highly stable layer of poly 3‐Amino‐5‐mercapto‐1,2,4‐triazole (p‐TA) have many coordination sites like exocyclic −SH group, one exocyclic −NH 2 group and three N cyclic atoms.…”