• S K Kulkarni

      Articles written in Pramana – Journal of Physics

    • Synthesis and analysis of ZnO and CdSe nanoparticles

      Shriwas S Ashtaputre Aparna Deshpande Sonali Marathe M E Wankhede Jayashree Chimanpure Renu Pasricha J Urban S K Haram S W Gosavi S K Kulkarni

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      Zinc oxide and cadmium selenide particles in the nanometer size regime have been synthesized using chemical routes. The particles were capped using thioglycerol in case of ZnO and 2-mercaptoethanol in case of CdSe to achieve the stability and avoid the coalescence. Zinc oxide nanoparticles were doped with europium to study their optical properties. A variety of techniques like UV-Vis absorption spectroscopy, X-ray diffraction (XRD), photoluminescence (PL), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM) were used to carry out structural and spectroscopic characterizations of the nanoparticles.

    • Synthesis and characterization of silica—titania core—shell particles

      Suchita Kalele Ravi Dey Neha Hebalkar J Urban S W Gosavi S K Kulkarni

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      Nearly monodispersed particles of silica were prepared and coated with uniform layers of titanium dioxide in anatase phase by hydrolysis and condensation of titanium butoxide. The coating thickness could be altered by adjusting the concentration of reactants (titanium butoxide and water) and the amount of added silica particles. Different coating thicknesses were deposited and studied using optical absorption spectroscopy, electron microscopy and Fourier transform infra-red spectroscopy. It was found that silica particles of size 170 ±5 nm were coated with 23±5 nm thick layer of titanium dioxide. Alternatively titania particles of size 340±5 nm were synthesized by controlled hydrolysis of titanium ethoxide in the presence of sodium chloride. These particles were further coated with 135±5 nm thick layer of silica to investigate changes in properties after changing the shell material

    • Synthesis and characterization of silica–gold core-shell (SiO$_{2} \@$ Au) nanoparticles

      Deepika Kandpal Suchita Kalele S K Kulkarni

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      This paper reports a systematic investigation of the growth and attachment of small gold nanoparticles to the functionalized surface of larger silica nanoparticles by three different methods. Nearly monodispersed silica particles and gold nanoparticles were prepared by sol–gel method. The size of the particle could be altered by changing the concentration of reactants, temperature and the time for which they react. The nanocore-shell particles prepared by three different methods were studied using scanning electron microscopy (SEM), UV–vis spectroscopy and Fourier transform infrared spectroscopy. We have found that the third method (c), a combination of the first two methods (a) and (b), has given better results.

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