Nitish Gupta

Synthesis and characterization of Fe2O3 nanoparticles by simple precipitation method

A simple and efficient synthesis of Iron-oxide nanoparticles was carried out by precipitation method using ferric chloride as precursor and ammonium hydroxide as a stabilizing agent at different calcination temperatures. The synthesized powder was characterized by powder X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscope (FE-SEM) and Transmission Electron Microscopy (TEM). X-ray diffraction indicated the formation hematite Fe2O3 structure. FTIR showed various functional groups of particles and absorption bands related to metal oxygen vibration modes. The heating temperatures were varied at 100 °C, 200°C, and 300°C. The Fe2O3 nanostructures with the average particle size of about 36.22 nm were prepared at 300°C for 4h. TEM study is also confirming the nanosize of Fe2O3 particle. This aqueous precipitation method gives a large scale production of Fe2O3 nanoparticles easily.

The role of Sr doping on structure and microstructural properties of LaFeO3

The doping of Strontium in LaFeO3 and its influence on the structural and microstructure properties were studied thoroughly. A few sets of Sr doping in La(1-x)FexO3, where x=0.00, 0.02, and 0.06 were made through the solution combustion synthesis method using urea as fuel. X-ray diffraction was applied to get information about the structure and purity. The Rietveld refinement on X-ray diffraction peaks have been done, in order to calculate various structural parameters. The morphology of La(1-x)SrxFeO3 nanoscale particles has been confirmed by field emission scanning electron microscopy (FESEM) technique. Differential scanning calorimetry (DSC) signals demonstrated the antiferromagnetic to paramagnetic transition (TN). The FTIR spectra was provided the information about various vibration modes in samples.

Structure and particle size analysis of LaFeO3 nanoparticles

Particle size analysis of LaFeO3 nanoparticles has been done through different methods. A simple low temperature syntheses of LaFeO3-NPs were carried out via PVA based sol-gel method. The role of PVA in this method is complexing agent. The product were characterized with the help of X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), and Transmission Electron Microscopy (TEM). The Rietveld refinement on X-ray diffraction peaks have been done in order to calculate various structural parameters. The Scherrer method was applied to calculate the crystallite size. Further, the crystallite size and associated lattice strain of LaFeO3-NPs were studied using Williamson-Hallmethod. The FESEM image shows the presence of spherical morphology. The formation of LaFeO3 nanoscale particles, with their size, has been confirmed by TEM characterization.

Synthesis and characterization of CuO nano particles using precipitation method

A simple and efficient synthesis of CuO nanoparticles was carried out by precipitation method using copper metal chips as precursor and sodium hydroxide as a stabilizing agent at different calcinations temperatures (100°C, 150°C, and 175°C). The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier Transform Infrared Spectroscopy (FTIR). XRD indicated monoclinic structure of CuO. SEM indicated the variation in nanostructures with the heating temperatures and FTIR inidcated Cu-O stretching frequencies. The CuO nanostructures with the average particle size of about 16.52 nm were prepared at 100°C for 3 hr. When the calcinations temperature was increased to 150°C and 175°C, CuO nanostructures with the particle size of about 17.41 nm, and 18.44 nm were obtained respectively. This aqueous precipitation method can give a large scale production of CuO nanoparticles easily.

Microwave-assisted synthesis and characterization of nickel ferrite nanoparticles

Nickel ferrite nanoparticles (NiFe2O4) were successfully prepared by microwave-assisted combustion method (MWAC) using citric Electron acid as a chelating agent. NiFe2O4 nanoparticles were characterized by X-ray diffraction (XRD) pattern, Scanning Microscopy (SEM), Fourier transform infrared (FTIR) and UV-Visible techniques. XRD analysis revealed that NiFe2O4 nanoparticles have spinel cubic structure with the average crystalline size of 26.38 nm. SEM analysis revealed random and porous structural morphology of particles and FTIR showed absorption bands related to octahedral and tetrahedral sites, in the range 400–600cm−1 which strongly favor the formation of NiFe2O4 nanoparticles. The optical band gap is determined by UV Visible method and found to be 5.4 eV.