Uniform and well dispersed metal sulfide semiconductor nanoparticles incorporated into matrices of alginate biopolymer are prepared by using a facile in situ method. The reaction was accomplished by impregnation of alginate with divalent metal ions followed by reaction with thioacetamide. XRD analysis showed that the nanoparticles incorporated in the polymer matrix were of cubic structure with the average particle diameter of 1.8 to 4.8 nm. Field emission scanning electron microscopy and high resolution transmission electron microscopy images indicated that the particles were well dispersed and distributed uniformly in the matrices of alginate polymer. FT-IR spectra confirmed the presence of alginate in the nanocomposite. The crystalline nature and thermal stability of the alginate polymer was found to be influenced by the nature of the divalent metal ions used for the synthesis. The proposed method is considered to be a simple and greener approach for large scale synthesis of uniform sized nanoparticles.
Cobalt hexacynoferrate decorated carbon spheres (CoHCF@C) with few micron dimensions was synthesized by sequential deposition method in which the carbon sphere previously modified with cobalt ion exposed into potassium ferricyanide. The thickness of the CoHCF layer was restricted to five cycles. The formation of layer CoHCF was confirmed by FT-IR, XRD, HRSEM, EDX and cyclic voltammeter technique. The CoHCF decorated carbon sphere modified GCE was utilized as electron transfer mediator for electrocatalytic oxidation of hydrazine in phosphate buffer medium. The electrocatalytic behavior of modified electrode on oxidation of hydrazine is compared with bare GCE. The amperometry method was adapted for the quantitative detection of hydrazine in water samples.
The crystalline semiconductor nickel oxide nano hollow sphere (NHS) is prepared by the template assisted solution phase growth method using carbon sphere. The NiO nano hollow spheres have diameters ranging from 400–500 nm in size, which is fabricated by NiO nanoparticles. The NiO nanoparticle sizes are ranges from 20–40 nm and their band gap energy is found 3.86 eV, it is used as P-type semiconductors. This NiO NHS is characterized by various analytical methods such as FT-IR spectra, X-ray diffraction pattern (XRD) and Energy Dispersive X-ray pattern (EDX). Then the surface and structure morphology are analysed by field emission scanning electron microscope (FESEM), High resolution scanning electron microscope (HRTEM). Our studies indicate that the NiO NHS modified glassy carbon electrode (GCE) exhibited excellent electrocatalysis for the determination and reduction of ethanol, and also oxidation of ascorbic acid (AA) and dopamine (Dop).
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