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General Chemistry

Special Issue: Nanomaterials

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Optical and Magnetic Properties of Superparamagnetic Fe3O4 Colloidal Nanoparticles

B. K. Pandey,*,a,b A. K. Shukla,b R. K. Kotanala,c J. Shah,c and R. Gopalb   

  1. a Laser Spectroscopy and Nanomaterials Lab, Department of Physics, University of Allahabad, Allahabad 211002, India; b Shyama Prashad Mukherjee Government PG College, University of Allahabad, Allahabad 211002, India; c CSIR-National Physical Laboratory New Delhi, Delhi, India
  • Received:2020-04-16 Revised:2020-05-24 Online:2020-12-20
  • Supported by:
     

Abstract: Magnetic nanomaterials gained widespread interest due to remarkable future applications in various fields. The purpose of present work is to explore magnetic and optical properties of ultra pure superparamagnetic Fe3O4 nanoparticles. Nowadays, superparamagnetism is receiving considerable interest in terms of biomedical and engineering applications. Herein, Fe3O4 superparamagnetic nanoparticles have been successfully synthesized by pulsed laser ablation method in the presence of anionic surfactants in liquid environments. The structural, morphological, optical and magnetic properties have been studies using X Ray diffraction (XRD), transmission electron microscope (TEM), UV-visible absorption, ATR-FTIR and vibrating sample magnetometer (VSM), respectively. The optical band gaps of as synthesized and after agglomeration Fe3O4 nanoparticles have been estimated in the range of 2.27—2.86 eV and 2.27—2.87 eV, depending on surfactant concentration. TEM image showed Fe3O4 nanoparticles possess mean diameter in the range of 5—25 nm. The saturation magnetization and coercivity of Fe3O4 nanoparticles have been estimated 0.36 emu·g-1 and 33 Oe at room temperature, respectively. Therefore, as synthesized Fe3O4 nanoparticles showed superparamagnetic character at room temperature.

 

Key words: magnetite, superparamagnetic Fe3O4 nanoparticles, optical properties, magnetic properties

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