Fast and selective determination of phenazopyridine at a novel multi-walled carbon nanotube modified ZnCrFeO₄magnetic nanoparticle paste electrode

Abstract

Fabrication process of MWCNTs/ZnCrFeO4 modified carbon paste electrode for electrocatalytic determination of phenazopyridine at the surface (a) CPE, and (b) MWCNTs/ZnCrFeO4 modified carbon paste electrode.

Highly selective differential pulse voltammetric determination of warfarin in pharmaceutical and biological samples using MnFe2O4/MWCNT modified carbon paste electrode

“…The reason for this may be due to the nanometer dimensions of MWCNTs, the electronic structure and the topological defects (edge plane-like sites/defects) present on MWCNTs surfaces. Meanwhile, the MWCNTs increase the effective area of the electrode [4].Therefore, they can incorporate into electrochemical sensors offering unique advantages including low detection limits, high sensitivities, reduction of over-potentials, and resistance to surface fouling [5,6].…”

“…of K 3 Fe(CN) 6 and ν is the scan rate. For 1mmol L -1 K 3 Fe(CN) 6 in the 0.1mol L -1 KCl electrolyte: n = 1 and D R =7.6×10 −6 cm 2 s −1 , then from the slope of the I pa -ν 1/2 relation, the real surface area was calculated.…”

“…For 1mmol L -1 K 3 Fe(CN) 6 in the 0.1mol L -1 KCl electrolyte: n = 1 and D R =7.6×10 −6 cm 2 s −1 , then from the slope of the I pa -ν 1/2 relation, the real surface area was calculated. The results showed that the electrode surface area was 0.0456 cm 2 ( Figure S2) for the unmodified carbon paste electrode and 0.1003cm 2 for…”

“…The atomic ratio is in agreement with the expected stoichiometry in the sample.Figure2A&2BElectrochemical impedance spectroscopy (EIS) gives insight into properties of electrode surface and electrolyte. The Nyquist plots of electrodes were obtained in ac frequency range of 0.1 Hz to 100 KHz in 10 -3 mol L -1 Fe (CN)6 3-/4-solution at polarization potential 0.15 V (see figure S1…”

Preparation of Fe2O3-Clorprenaline/Tetraphenylborate Nanospheres and Their Application as Ion Selective Electrode for Determination of Clorprenaline in Pork

“…Nanomaterials have severed as promising candidates for modifiers and are commonly used in the construction of potentiometric sensors. As reported in the literatures, the linear range and detection limits of potentiometric sensors modified with nanomaterials have been improved by several orders of magnitudes compared to their unmodified counterparts [ 15 – 17 ]. Hematite (α-Fe 2 O 3 ) is one of the most promising nanomaterials with high electric conductivity, large surface area, and good photocatalytic activity [ 18 – 20 ], which has received considerable attention due to its versatile applications in fabricating gas sensors [ 21 , 22 ].…”