Shivaji University

About: Shivaji University is a education organization based out in Kolhāpur, Maharashtra, India. It is known for research contribution in the topics: Thin film & Scanning electron microscope. The organization has 3078 authors who have published 5295 publications receiving 115397 citations.

Hierarchical 3D-flower-like CuO nanostructure on copper foil for supercapacitors

Abstract: We report a trouble-free chemical synthesis of copper oxide (CuO) nanoflowers on flexible copper foil (Cu) and their use as electrodes for supercapacitors. Various characterization techniques, such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), and Brunauer–Emmett–Teller (BET) analysis, have been used to characterize CuO nanostructure. Supercapacitive properties show that CuO electrodes exhibit a high specific capacitance of about 498 F g−1 at 5 mV s−1, with a high energy density of 26 W h kg−1 in KOH electrolyte. Moreover, impedance analysis showed lower ESR value, high power performance, and an excellent rate as well as frequency response for the CuO electrodes. The excellent electrochemical properties of the CuO electrodes indicate that they have many potential applications in high-performance supercapacitors.

Preparation and characterization of copper-doped anatase TiO2 nanoparticles with visible light photocatalytic antibacterial activity

Abstract: Anatase titanium dioxide (TiO 2 ) nanoparticles doped with copper (1.0–3.0 mole%) were synthesized by sol–gel method. The UV–visible diffused reflectance measurement revealed that the doping of the Cu 2+ ions in TiO 2 lattice extends its optical absorption in the visible region. XRD and XPS analysis revealed that the substitutions of the few sites of Ti 4+ ions by Cu 2+ ions. TEM analysis revealed the non-spherical nanoparticles size within the range 8–12 nm. The role of hydroxyl radicals during bacterial inactivation was studied by photoluminescence technique. The bactericidal activity of copper doped titanium dioxide nanoparticles was tested against pathogenic bacteria Escherichia coli and Staphylococcus aureus under visible light irradiation. The bacterial survival does not seem to be affected by in contact with nanoparticles in dark.

Effect of cobalt substitution on the properties of nickel-copper ferrite

Abstract: Cobalt-substituted nickel–copper ferrite samples having the chemical formula Ni0.95−xCoxCu0.05Fe2O4, where x varies as 0.01, 0.02 and 0.03, were prepared by the standard double sintering ceramic technique. The formation of the ferrite phase was confirmed by x-ray diffraction (XRD) studies. Resistivity and thermo-emf variation with temperature were studied in the temperature range from room temperature to 773 K as a function of cobalt content. As the cobalt content increases, the resistivity of the ferrites decreases. AC conductivity measurements made in the frequency range 100 Hz–1 MHz show that conduction in these ferrites is due to small polaron hopping. The dielectric constant and loss tangent (tanδ) were measured at room temperature as a function of frequency in the range 20 Hz to 1 MHz. The room-temperature dielectric measurements show dispersion behaviour with increasing frequency. To understand the conduction mechanism, complex impedance measurements were carried out. The variation in saturation magnetization (Ms) with variation of cobalt content is also studied.