A. V. Raut

Bio: A. V. Raut is an academic researcher. The author has contributed to research in topics: Crystallite & Nanoparticle. The author has co-authored 3 publications.

Sol-Gel synthesis, structural characterizations, photo- catalytic degradation for H2 production and UV-Absorption of yttrium-substituted Co-Zn ferrite nanoparticles

Abstract: An effect of trivalent yttrium ion substitution on the structural properties of Co-Zn ferrite has been studied after the fabrication of Co1-xZnxFe2-yYyO4 nanoparticles at a typical concentration (x=0.3, y=0.2). The synthesis of Co1-xZnxFe2-yYyO4 nanoparticles was carried out via sol-gel auto-combustion technique using the citric acid as a fuel with a metal nitrate to citrate ratio of 1:3. X-ray diffraction studies of Co1-xZnxFe2-yYyO4 nanoparticles were carried out to study the structural parameter and phase purity. In this study, the XRD pattern revealed the presence of Bragg's reflections belongs to the cubic spinel structure. The Y3+ ion doping creates additional phases in the Co-Zn ferrite, which plays a crucial role in controlling the physicochemical properties of the typical samples. The crystallite size (t) was estimated using Debye-Scherrer's formula and reported to be decreased as a result of Y3+ ionic exchange as per the expectations. Y3+ ion substituted Co-Zn ferrite (with Y content = 0.02 per formula unit) may be considered for an attenuation application in the particular range. Visible range light was used for the photocatalytic degradation measurements using methylene Blue dye. In particular, an enhanced degradation efficiency of Co1-xZnxFe2-yYyO4 nanoparticles was observed. The UV-vis spectroscopic studies were performed and reported in the wavelength range 220 - 400 nm to check the absorbance of methylene blue dye at different time intervals.

X-ray diffraction and infrared characterization of NiFe2O4 nanoparticles (NFNPs) prepared using dextrose assisted sol-gel auto-combustion technique

Abstract: In the current work, we comprehensively focused upon the synthesis of NiFe2O4 nanoparticles (NFNPs) via the sol-gel auto-combustion method. Particularly in the present investigation, we deployed dextrose (C6H12O6) as an organic compound that works as a fuel in the sol-gel synthesis of NFNPs. The as-prepared samples of NFNPs were characterized for structural properties through XRD. The crystallite size (t), the lattice constant (a), unit cell volume (V), and X-ray density dX of NFNPs was determined using XRD data. Crystallite size was obtained through Debye-Scherrer’s formula indicates the nanocrystalline nature of the prepared NFNPs sample. The infrared spectroscopy (IR) was carried out for investigating the presence of phases and the function group analysis in the NFNPs. The IR has confirmed the formation of ferrite phase in dextrose assisted sol-gel synthesized NFNPs as we report the intrinsic vibrations belongs to the tetrahedral and octahedral sites.

Glycine assisted sol-gel synthesis and structural analysis of CoFe2O4 nanoparticles

Abstract: In this work, we tried to investigate the structural properties of cobalt ferrite (CoFe2O4) nanoparticles synthesized via the sol-gel auto-combustion method. The synthesis of cobalt ferrite was carried out by glycine assisted auto-ignition in the sol-gel method. The preparation conditions and sintering temperature during the synthesis creates additional phases in the respective materials, which may play an important role in several applications because of their controlled physical properties. Therefore, CoFe2O4 nanoparticles were considered as a good candidate for high-frequency applications. The X-ray diffraction study of CoFe2O4 nanoparticles was carried out for phase purity. XRD pattern revealed the presence of Bragg's reflections which belong to the cubic spinel structure. The Miller indices (hkl) were identified using the standard method and the FWHM of the most intense peak (311) was used for the calculation of crystallite size. The crystallite size (t) was estimated using Debye-Scherrer's formula and found to be 32.16 nm which is following our expectations.