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Synthesis of Pt Decorated Copper Oxide Nanoleaves and Its Electrochemical Detection of Glucose
Felix, Sathiyanathan,Chakkravarthy, Bala Praveen,Jeong, Soon Kwan,Grace, Andrews Nirmala The Electrochemical Society 2015 Journal of the Electrochemical Society Vol.162 No.6
<P>A novel platinum decorated CuO nanoleaves were synthesized through a facile co-precipitation method and further utilized as a sensing platform for glucose based on immobilization of Pt-CuO hybrid nanostructures with Nafion matrix. The prepared composites were characterized by X-ray Diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The modified electrode exhibits excellent electrocatalytic activity towards glucose as probed by cyclic voltammetry (CV) and chronoamperometry (CA) techniques. Comparing with pure CuO/Nf/GCE, Pt-CuO/Nf/GCE, as non-enzymatic electrode materials, exhibited a good response towards glucose with linear range 2–1000 μM with a higher sensitivity of 1681.7 μA mM<SUP>−1</SUP>cm<SUP>−2</SUP> and detection limit of 11 μM. The excellent electrocatalytic performances could be attributed to the Cu(II)/Cu(III) multiple oxidation states system could promote the redox reactions between electrode materials and glucose, and the electroactive sites became more active due to the synergic effect. The results, high sensitivity, excellent selectivity and long term stability showing that, Pt-CuO is a promising material for the future development of nonenzymatic glucose sensors.</P>
Synthesis of Cobalt Sulfide–Graphene (CoS/G) Nanocomposites for Supercapacitor Applications
Ramachandran, Rajendran,Felix, Sathiyanathan,Saranya, Murugan,Santhosh, Chella,Velmurugan, Venugopal,Ragupathy, Bala Praveen Chakkravarthy,Soon Kwan Jeong,Grace, Andrews Nirmala IEEE 2013 IEEE TRANSACTIONS ON NANOTECHNOLOGY Vol.12 No.6
<P>Cobalt sulfide (CoS) and graphene nanocomposites were prepared from cobalt nitrate, thioacetamide, and graphene as starting materials in the presence of poly(vinylpyrrolidone) as surfactant. Furthermore, its morphology and properties were characterized by X-ray diffraction (XRD), field-emission scanning electron microscope, diffusive reflectance ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, and electrochemical measurements. The XRD reveals the amorphous nature of the nanocomposites. The as-prepared nanocomposites were tested for its supercapacitance property by cyclic voltammetric (CV) experiment in 6M KOH electrolyte. CV was performed at a potential range of 0 to -0.8 V at different scan rates, and results show an excellent capacitive behavior of the nanocomposites. A maximum specific capacitance of 2423.3 F/g was obtained at a scan rate of 5 mV/s.</P>