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M.V. Sangaranarayanan
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M.V. Sangaranarayanan
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M.V. Sangaranarayanan
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M.V., Sangaranarayanan
Sangaranarayanan, M. V.
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5 results
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- PublicationThiourea linked glycolipid-assisted synthesis of sub-micrometer sized polyaniline spheres for enzyme less sensing of dopamine(01-04-2020)
;Ramkumar, Ramya ;Mathiselvam, M.A simple methodology of synthesizing sub-micrometer sized polyaniline (PANI) spheres using gold electrodes with thiourea linked glycolipid self-assembly for the selective detection of dopamine (DA) is reported here. The synthesis was carried out using a potentiodynamic polymerization method. The self-assembled thiourea linked glycolipid on the gold electrodes and the same lipid acting as the surface directing agent for the formation of polyaniline microspheres is the highlighting factor in this work. The biocompatible sub-micrometer polyaniline spheres are characterized using scanning electron microscopy and transmission electron microscopy studies. Amperometry and electrochemical impedance spectroscopy were employed to estimate the concentration of dopamine. The amperometric studies reveal a linear range of ~ 1 to 640 μM, sensitivity of 370 μA cm−2 μM−1, a very low detection limit of 10 nM, and a response time of ~ 5 s. The interference from l-Dopa, ascorbic acid and uric acid has been minimized on account of the Nafion (Nf) coating and selectivity of the electrode. Real sample analysis was carried out using standard addition method. Graphic abstract: [Figure not available: see fulltext.]Schematic representation for the formation of sub-micrometer PANI spheres using thiourea linked glycolipid on Au electrodes for sensing of dopamine. - PublicationShape-controlled electrodeposition of silver using chitosan as structure-directing agent on disposable pencil graphite electrodes: low-cost electrocatalysts for the detection of hydrogen peroxide and hydrazine hydrate(01-11-2020)
;Preethi, S.A facile synthetic protocol for the electrodeposition of diverse morphologies of silver on disposable pencil graphite electrodes (Ag/PGE) in the presence of chitosan as structure-directing agent (SDA) is reported. The influence of various electrodeposition parameters on the morphology of Ag deposited has been studied and interpreted using electron microscopic techniques. Several impressive morphologies such as hexahedron, leaf and dendrites have been observed for Ag/PGE with respect to change in experimental conditions. Furthermore, the crucial role of chitosan in determining the morphology of Ag/PGE has been elucidated with the help of three-dimensional Scharifker-Hills nucleation and growth model. The electrocatalytic activities of various Ag/PGEs towards the reduction of hydrogen peroxide (HP) and oxidation of hydrazine hydrate (HH) have been studied in detail with the help of diverse electrochemical techniques. In comparison with PGE, the Ag hexahedron- (Ag-Hex/PGE) and Ag dendrite- (Ag-Dend/PGE) modified PGEs exhibited excellent electrocatalytic activity towards HP and HH, respectively. The Ag-Hex/PGE displayed a wide linear range of 0.1–20,000 μM with a limit of detection (LOD, 3σ/m) of 0.06 μM for HP reduction. On the other hand, a linear range of 25–20,000 μM with LOD of 1.8 μM for HH oxidation has been observed for Ag-Dend/PGE. Furthermore, the modified Ag/PGEs revealed remarkable reproducibility and long-term storage stability. The practical applicability of the Ag-Hex/PGE and Ag-Dend/PGE was demonstrated through the electrocatalytic detection of HP in milk and HH in tap water samples with satisfactory recovery results. - PublicationParadigm shift in electrochemistry education and research: new opportunities from a theoretical perspective(01-01-2023)The present-day electrochemistry education requires expertise in diverse branches of science and engineering, both from fundamental perspectives and industrial applications. The importance of non-equilibrium thermodynamics formalism and diverse phenomenological versions is pointed out for electron transfer processes at electrode surfaces and charge transport in redox polymer electrodes. The crucial role envisaged for students of mathematics and physics to make a substantial impact in modelling of electron transfer phenomena is highlighted. Graphical Abstract: [Figure not available: see fulltext.]