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Effect of Fuel to Oxidizer Ratio on the Structure, Micro Structure and EPR of Combustion Synthesized NiO Nanoparticles

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In this work we describe the synthesis, micro structure (XRD, SEM) and EPR of NiO nanoparticles synthesized by urea-based combustion method using Ni nitrate as the source of Ni. We used fuel-to-oxidizer ratio (Ψ) as a control parameter to investigate how lattice parameter, particle size and EPR susceptibility vary with Ψ = 0.25 to 2. Earlier we have studied NiO as a substitutional solute in MgO. The average particle size of NiO was estimated from the full width half maximum (gaussian and lorentzian fits) of the X-ray diffraction peaks of powders using Sherrer's formula and Williamson-Hall plot. The particle size varies from 7 nm to 38 nm as Ψ is varied systematically. The surface areas were measured using BET method. FT-IR confirms the Ni-O crystalline bond formation. We also calculated porosity and strain in the NiO nanoparticles with varying Ψ. EPR spectra have yielded the susceptibility of the NiO nanoparticles. Band gap of NiO was determined by UV-visible absorption edge.
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Document Type: Research Article

Publication date: 2008-08-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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