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Micro Structural, Optical and Magnetic Properties of Co–SiO2 Nanocomposite Synthesized by Sol–Gel Technique

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Abstract

Co–SiO2 nano composite has been synthesized via sol–gel technique using dextrose [C6H12O6] as a reducer and tetraethyl orthosilicate [Si(OCH2CH3)4] as oxide forming agent, respectively. The dried gel has been subsequently calcined at different temperature (850 and 900 °C) for 30 min in an inert atmosphere by N2 purging. The synthesized materials have been characterized by X-ray diffraction, high resolution transmission microscope, Fourier transform infrared spectroscopy, UV–Vis spectroscopy, scanning electron microscope, field emission microscope, atomic force microscope and physical property measurement system. The crystallite sizes of the face centered cubic cobalt nano composite materials have been found to be in the range of 14–28 nm. The crystallite size of the material found to be increased at higher calcination temperature due to the grain growth. The surface morphology of the obtained material has been found to be agglomerated but spherical in nature. This agglomeration tendency could be attributed to magnetic interaction between particles, large surface area as well as high surface energy. The band gap value of the obtained material has been determined to be 1.92 eV. The saturation magnetization (Ms) and the coercivity (Hc) of the composite material were found to be 29.45 emu g−1and 23.2 Oe, respectively. This technique has thus been found to be a convenient and effective method to prepare pure metallic cobalt nanoparticles with uniform size and homogeneous distribution throughout the matrix.

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Acknowledgments

This Paper was presented at the "Indian Workshop and Symposium on Modelling, Experimentation and Simulation on Complex Systems (Mescos 2015)" Held at HIT, Haldia during August 5–7, 2015.

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Authors and Affiliations

  1. Department of Metallurgical and Material Engineering, Jadavpur University, Kolkata, 700032, West Bengal, India

    Mrinal Saha & Siddhartha Mukherjee

  2. Amity University, Kolkata, 700152, West Bengal, India

    Soumya Mukherjee

  3. Department of Chemistry, Jadavpur University, Kolkata, 700032, West Bengal, India

    Arup Gayen

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  1. Mrinal Saha
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Saha, M., Mukherjee, S., Gayen, A. et al. Micro Structural, Optical and Magnetic Properties of Co–SiO2 Nanocomposite Synthesized by Sol–Gel Technique. J. Inst. Eng. India Ser. D 98, 91–99 (2017). https://doi.org/10.1007/s40033-016-0116-x

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