Papers by govind singh Chandrawat
Macromolecular symposia, Feb 1, 2024
Synthesis, characterization and structural analysis of Bis-Schiff bases using 3,3´methylendianili... more Synthesis, characterization and structural analysis of Bis-Schiff bases using 3,3´methylendianiline and salicylaldehyde derivatives
We report the synthesis and characterization of FeS 2 nanoparticles (NPs) in view of their possib... more We report the synthesis and characterization of FeS 2 nanoparticles (NPs) in view of their possible applications, which may range from organic and inorganic based hybrid solar cells to the replacements of Lithium Batteries (LIBs). The Polyol method was used to prepare the Iron Pyrite (FeS 2) NPs with reducing reagent Ethylene Glycol (EG) and precursor Thiourea. The crystalline quality and stoichiometry of synthesized FeS 2 NPs were confirmed by X-ray diffraction (XRD) and Raman Spectroscopy, which gave an average crystallite size of 35.4 nm. The Rietveld refinement of the diffraction data revealed the lattice parameters, hkl values, phase, Rp (Profile Factor) etc. of FeS 2 NPs through the profile matching routine of FullProf software. The elemental has been investigation has been performed using Energy-Dispersive X-ray Spectroscopy (EDS), where characteristic emission peaks of Fe and S elements were observed. Further, Raman Spectroscopy experiment provided information on chemical bonding and symmetry of molecules for the device possibilities of surfactant coated FeS 2 NPs.
DAE SOLID STATE PHYSICS SYMPOSIUM 2019, 2020
The Polyol chemical synthesis method being a simple and economic method for preparation of nanopa... more The Polyol chemical synthesis method being a simple and economic method for preparation of nanoparticles (NP) was used to prepare Iron Pyrite (FeS2) NP with surfactant octylamine and precursor Thiourea. The crystalline quality and stoichiometry of these NPs were confirmed by X-ray diffraction and Raman Spectroscopy, which gave an average crystallite size of ∼30 nm. The sharp well-defined nature of the peaks indicated good crystallinity of the samples. The Rietveld refinement of the diffraction data revealed the lattice parameters, hkl values, phase, Profile Factor etc. of FeS2 NP. The elemental composition was determined using Energy-Dispersive X-ray Spectroscopy, where characteristic emission peaks of Fe and S elements without other chemical impurities were observed. Further, Raman Spectroscopy provided information on chemical bonding and symmetry of molecules in these surfactant coated FeS2 NP. The strain introduced in these NP during synthesis is also discussed.
Journal of Nano- and Electronic Physics, 2020
In this work, we have deposited FeNi (60 nm) film on Si (111) substrate using electron beam evapo... more In this work, we have deposited FeNi (60 nm) film on Si (111) substrate using electron beam evaporation technique. XRD measurements carried out on thin film with annealing the sample from 100 to 400 C show increase in intensity of the FeNi (111) diffraction peak. The particle size increases from 19 nm (as deposited sample) to 27 nm (400 C) with annealing. The magnetization measurements carried out using MOKE technique show enhancement in coercivity with annealing. The overall results are attributed in terms of annealing induced structural change which modify the magnetic properties.
AIP Conference Proceedings, 2019
We report the synthesis and characterization of FeS 2 nanoparticles (NPs) in view of their possib... more We report the synthesis and characterization of FeS 2 nanoparticles (NPs) in view of their possible applications, which may range from organic and inorganic based hybrid solar cells to the replacements of Lithium Batteries (LIBs). The Polyol method was used to prepare the Iron Pyrite (FeS 2) NPs with reducing reagent Ethylene Glycol (EG) and precursor Thiourea. The crystalline quality and stoichiometry of synthesized FeS 2 NPs were confirmed by X-ray diffraction (XRD) and Raman Spectroscopy, which gave an average crystallite size of 35.4 nm. The Rietveld refinement of the diffraction data revealed the lattice parameters, hkl values, phase, Rp (Profile Factor) etc. of FeS 2 NPs through the profile matching routine of FullProf software. The elemental has been investigation has been performed using Energy-Dispersive X-ray Spectroscopy (EDS), where characteristic emission peaks of Fe and S elements were observed. Further, Raman Spectroscopy experiment provided information on chemical bonding and symmetry of molecules for the device possibilities of surfactant coated FeS 2 NPs.
Journal of Nano- and Electronic Physics, 2020
FeS2 nanoparticles were prepared using a simple and cost-effective Polyol method with ethylene gl... more FeS2 nanoparticles were prepared using a simple and cost-effective Polyol method with ethylene glycol and precursor thiourea as capping reagents. The crystalline structure of FeS2 nanoparticles were confirmed by X-ray diffraction. Dimensions of the unit cell and Pa-3 space group were determined by Rietveld refinement. The average crystallite size was found to be ~ 42.1 nm. The stoichiometry of these nanoparticles were also confirmed by, Raman and Fourier Transform Infrared Spectroscopy. Further, Raman spectroscopy revealed the chemical bonding and symmetry of molecules. FTIR spectroscopy exhibited the presence of functional groups of Fe=S, Fe-S and S-S in the samples. Advanced measurements and analysis towards the applicability of surfactant coated pyrite FeS2 nanoparticles for solar cell etc. applications are in progress.
Journal of Alloys and Compounds, 2021
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Uploads
Papers by govind singh Chandrawat