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Advanced Nano-Bio-Materials and Devices – AdvNanoBioMD 2020; Vol 4; Issue 3 is now being populated. Thank you for all the contributors and reviewers!

Advanced Nano-Bio-Materals and Devices – AdvNanoBioMD 2020; Vol 4; Issue 3 (September 30)

Structure and properties of commercial Chitosan-50 powder ((C6H11NO4)n, M=500.000, Wako Pure Chemical Industries Ltd.) were investigated. XRD, IR spectroscopy, DTGA and SEM were used. It was shown that chitosan powder is characterized only by chitosan phase and flaky flat irregular particles and agglomerates sized from 5 nm to 200 μm. Decomposition of chitosan is complete at 580 °C. Specific surface area, which was measured by nitrogen adsorption-BET method, is equal to 0.80±0.01 m2/g and skeleton density, which was measured by helium pycnometery, is equal to 1.49±0.01 g/cm3. According to zeta potential investigation it was established that chitosan is characterized by electrostatic stability in ethanol and isopropanol and lack of electrostatic stability in water and acetone.

Glassy carbon electrode (GCE) has been modified by mechanical entrapment method with Polyaniline Nanoparticles / Graphene for developing a new nanosensor (PANINPs/GR/GCE). It was characterized by electrochemical analysis to evaluate it as a nano-sensor for analytical electrochemistry. A standard solution of 0.06 mM K4[Fe(CN)6] in 0.1M KCl was used as an electrolyte, in order to study the Fe(II) / Fe(III) redox current peaks at various concentrations, pH, scan rates, measurement of diffusion coefficient, stability and reliability on the modified electrode. It was found that the new modified electrode (PANINPs/GR/GCE) improved the oxidation-reduction current peaks of Fe(II)/Fe(III) ions at 25 oC from 6.71 to 23 µA and -5.14 to -17.5 µA, respectively. The current ratio anodic to cathodic current peaks was found Ipa/Ipc ≈ 1 of the new modified electrode with the potential peak separation of ∆Epa-c = 100 mV, which has shown a reversible and heterogeneous reaction of the new modified electrode in electrolyte. The new nanosensor has low detection limit, with good reliability and stability of nanoparticles on the GCE surface, and improved the oxidation-reduction current peaks in acidic medium.