A versatile route to synthesize MgO nanocrystals by combustion technique

K Kaviyarasu, Prem Devarajan
unpublished
II-VI semiconductor nanocrystals are recently developed class of nanomaterials whose unique photophysical properties are helping to create a new generation in the field of photonics and microelectronics. In this review, we examine the progress in adapting these nanomaterials for several optoelectronics application followed by characterization studies. Magnesium oxide (MgO) nanoparticles were characterized by X-ray powder diffraction and the peaks are quite agreeable with the pure phase cubic
more » ... pure phase cubic structure. The XRD pattern confirms the crystallinity and phase purity of the sample. Photoluminescence measurement reveals the systematic shift of the emission band towards the lower wavelength thereby ascertaining the quantum confinement effect. Photoluminescence spectra of pure MgO were investigated, showing emission peaks around 475 nm relating to new energy levels induced by defects or defect levels generation. The SEM results reveal that the resultant nanopowders are porous and agglomerated with polycrystalline nano entities. Field emission scanning electron microscopic studies showed that the average size of the nanoparticles were 20 nm and 33 nm respectively. The dielectric loss of the MgO samples decreases with increase in frequency. Similar trend is observed for the dielectric constant also.
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