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Javidan A.,Nanoscience Research Center | Rafizadeh S.,Islamic Azad University at Qom | Mostafa Hosseinpour-Mashkani S.,Islamic Azad University at Qom
Materials Science in Semiconductor Processing | Year: 2014

Monoferrite strontium ferrite nanoparticles were successfully synthesized in the presence of strontium oxalate, [(SrC2O4)], as strontium precursor by using solid-state thermal decomposition method. X-ray diffraction study was used to determine phase purity, crystal structure, and average crystallite size of the strontium ferrite nanoparticles. The electrical conductivity measurement of the sintered sample was carried out at 300 °C. Metal nitrates and oxalate precursor without any solvent or surfactant were used in this method; later, they were decomposed at 850 °C for 2 h in a gas mixture of 85% Ar and 15% H2. The average diameter of the strontium ferrite nanoparticles was 40 nm. The as-prepared strontium ferrite nanoparticles were characterized extensively by techniques like XRD, transmission electron microscope (TEM), high-resolution TEM (HRTEM), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), vibrating sample magnetometer (VSM), room temperature photoluminescence (Pl), ultraviolet-visible spectroscopy (UV-vis), and energy dispersive spectrometry (EDS). © 2014 Elsevier Ltd. Source

George T.,Kings College | Sunny A.T.,Kerala University | Varghese T.,Nanoscience Research Center
IOP Conference Series: Materials Science and Engineering | Year: 2015

Cobalt ferrite nanoparticles of average size 18 nm are synthesized by sol-gel method and investigated the magnetic properties. The saturation magnetization value calculated from vibration sample magnetometer (VSM) studies for CoFe2O4 is lower than the reported value for the bulk. The magnetization curves demonstrate a trend towards the superparamagnetic behavior of the as-prepared CoFe2O4 nanoparticles. The microwave magnetic parameters show a decreasing trend with the increase of frequency. © Published under licence by IOP Publishing Ltd. Source

Javidan A.,Nanoscience Research Center | Ramezani M.,Islamic Azad University of Arak | Sobhani-Nasab A.,Islamic Azad University of Arak | Hosseinpour-Mashkani S.M.,Islamic Azad University of Arak
Journal of Materials Science: Materials in Electronics | Year: 2015

As a new precursor, barium oxalate (BaC2O4) complex was used in a solid-state thermal decomposition process for the synthesis of BaFe2O4 nanoparticles without using any surfactants or additives. The as-synthesized products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectrometry, vibrating sample magneto meter, and EDS. To form pure BaFe2O4, the as-prepared products were calcined at 800 °C for 2 h in a gas mixture of 85 % Ar and 15 % H2. The saturation magnetization, remanent magnetization, and coercivity of the BaFe2O4 nanoparticles were 15, 5 emu/g, and 2500 Oe, respectively. © 2015, Springer Science+Business Media New York. Source

Manjunath K.,Jain University | Ravishankar T.N.,Jain University | Kumar D.,BMS College of Engineering | Priyanka K.P.,Nanoscience Research Center | And 7 more authors.
Materials Research Bulletin | Year: 2014

Zinc oxide nanoparticles (ZnO Nps) were successfully synthesized by solution combustion method (SCM) using pigeon pea as a fuel for the first time. X-Ray diffraction pattern reveals that the product belongs to hexagonal system. FTIR spectrum of ZnO Nps shows the band at 420 cm-1 associated with the characteristic vibration of Zn-O. TEM images show that the nanoparticles are found to be ∼40-80 nm. Furthermore, the as-prepared ZnO Nps exhibits good photocatalytic activity for the photodegradation of methylene blue (MB), indicating that they are indeed a promising photocatalytic semiconductor. The antibacterial properties of ZnO nanopowders were investigated by their bactericidal activity against four bacterial strains. © 2014 Elsevier Ltd. Source

Priyanka K.P.,Nanoscience Research Center | Anu Tresa S.,Mahatma Gandhi University | Jaseentha O.P.,Nanoscience Research Center | Varghese T.,Nanoscience Research Center
Materials Research Express | Year: 2014

Titania nanoparticles were synthesized using the sol-gel method. Nano-sized Ce particles were doped into nanotitania using the metal sol method. As-synthesized TiO2 and Ce doped TiO2 nanoparticles were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible spectroscopy and photoluminescence (PL) spectroscopy. Photocatalytic degradation of methylene blue by undoped and ceria-doped titania was investigated under visible light. The dye degradation capabilities of nano-sized Ce-TiO2 catalysts were found to be superior to undoped TiO2 nanoparticles. The higher photoactivity of TiO2 can be ascribed to the effect of Ce dopants on band gap narrowing, and acting as electron traps on the Ce-TiO2 surface. Dye degradation studies show that nanotitania doped with Ce is suitable for higher photocatalytic activity under visible light. © 2014 IOP Publishing Ltd. Source

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