A new modified working electrode of glassy carbon electrode with nanoparticles of SiO 2 (SiO 2 nanoparticles/GCE) was prepared by mechanical attachment method. The modified electrode (SiO 2 nanoparticles/GCE) was characterised by electrochemical analysis using cyclic voltammetric technique to evaluate this electrode as nano-sensor. A standard solution of 1 mM K 4 [Fe(CN) 6 ] with 1 M KCl as an electrolyte was used to study the redox current peaks of FeII/FeIII ions on the modified electrode at different concentrations, scan rates, pH, determination of diffusion coefficient (D f ), reliability and stability of the modified electrode. It was found the new nano-sensor (SiO 2 nanoparticles/GCE) had enhancement for the oxidation and reduction current peak of FeII/FeIII ions of about 1.29 and 1.58 µA, respectively. The current ration value of the new modified electrode was I pa /I pc = 1.7 with the peak separation of ∆E pa-c = 140 mV, which demonstrated that the new modified electrode acted in electrolyte as irreversible and heterogeneous reaction, had low detection limit, and enhanced the redox current peaks in acidic pH with good reliability and stability of nanoparticles on the surface of GCE.
A new modified glassy carbon electrode (GCE) with grafted polymer (GP)/SiO 2 nanoparticles (SiO 2 NPs) were prepared using mechanical attachment method to produce a new sensor in cyclic voltammetric technique. The new working electrode GP/SiO 2 NPs/GCE was characterized by a standard solution of 1 mM K 4 [Fe(CN) 6 ] with 1 M K 2 HPO 4 as an electrolyte to study the redox current peaks of FeII/FeIII ions at different concentrations such as scan rate, pH, determination of diffusion coefficient (D f), reliability and stability of the modified GCE. It was found that the new modified electrode enhanced the redox current peaks of FeII/FeIII from 12 µA to 20 µA and-5 µA to-15 µA for oxidation and reduction peaks in GCE, repectevely. So, the current ratio (Ipa/Ipc) for the new modified electrode was 1, and the potential peak separation (ΔEpa-c) was 100 mV, which indicated good electrochemical properties as an irreversible electrode and heterogeneous reaction. Good reliability and stability of modified GCE was obseved with low detection limit. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) analysis of the nano-deposit was also studied.
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