N. Nallamuthu

Structural characterization and electrical conductivity studies of BaMoO4 nanofibers prepared by sol–gel and electrospinning techniques

Scheelite type BaMoO4 nanofibers were prepared by using acrylamide assisted sol–gel process and electrospinning technique. The prepared Scheelite BaMoO4 nanofibers were characterized by using TG/DTA, XRD, FTIR, FT-Raman and SEM–EDX techniques. Thermal behavior, crystalline phase and structure of the prepared BaMoO4 nanofibers samples were confirmed from the analysis of the obtained results of TG/DTA, XRD, FTIR and FT-Raman respectively. SEM micrographs along with EDX showed the formation of one dimensional (1D) nanofibers 100–350xa0nm diameters and existence of Ba, Mo and O elements in the BaMoO4 nanofibers sample. The electrical conductivity of BaMoO4 nanofibers as a function of temperature 200–400xa0°C under air was evaluated by analyzing the measured impedance data using the winfit software. The newly prepared Scheelite type BaMoO4 nanofibers showed electrical conductivity of 0.92xa0×xa010−3xa0S/cm at 400xa0°C.

Synthesis of SiO2/CoFe2O4 nanocomposite by Base Catalyst Assisted In‐situ Sol‐Gel Process

Base catalyst assisted in‐situ sol‐gel process is used for the synthesis of SiO2/CoFe2O4 nanocomposite consists of CoFe2O4 nanocrystals coated over SiO2 particles. The crystalline phase formation of CoFe2O4 is identified using powder X‐ray diffraction (XRD) patterns and the structural coordination of CoFe2O4 over SiO2 particles in the SiO2/CoFe2O4 nanocomposite is analyzed using Fourier transform infrared (FTIR) spectra. The morphology and the presence of elements and their distribution are analyzed using scanning electron microscopy (SEM) images and elemental dispersive spectroscopy (EDS).