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Kaviyarasu K.,Materials Research Center | Manikandan E.,B.S. Abdur Rahman University | Manikandan E.,IThemba LABS National Research Foundation NRF of South Africa | Kennedy J.,Institute of Geological & Nuclear Sciences | Jayachandran M.,CSIR - Central Electrochemical Research Institute
Materials Letters | Year: 2014

The present technique may open a new doorway to one dimensional nanofibers from the same kind of materials with irregular shape or large size. Intense photoluminescence was also observed with some spectral tuning possibly giving a range of emission photon energies approximately spanning from 2.5 to 3.4 eV. The resulted CdO nanofibers have an average size in the range of 50 nm and a uniform cubic shape shown by electron microscopy analysis. μ-Raman spectroscopy showed that the products were NaCl cubic structure CdO with the first and second harmonic modes at 303.5 cm-1 and 593.0 cm -1 respectively. The above studies demonstrate the potential for the utilization of cadmium oxide nanofibers in visible opto-electronics applications. © 2014 Elsevier B.V. Source


Kaviyarasu K.,Sri Sankara Arts and Science College | Kaviyarasu K.,IThemba LABS National Research Foundation NRF of South Africa | Maria Magdalane C.,St Xaviers College Autonomous | Anand K.,Durban University of Technology | And 2 more authors.
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2015

In this report, we examine the progress in adapting these nanomaterials for several predominantly photonics device fabrication by wet-chemical method. Nanocomposite of magnesium oxide (MgO) with copper oxide (CuO) doped nanoparticles were characterized by X-ray powder diffraction (XRD) and the observed peaks are quite agreeable with the pure phase cubic structure. High-resolution transmission electron microscopic (HR-TEM) results reveal that the resultant nanopowders are porous and agglomerated with polycrystalline nano-entities. Field emission of selected-area electron diffraction (SAED) studies showed that the average size of the nanoparticles were 20 nm. Photoluminescence spectra of MgO:CuO were investigated, showing emission peaks around 375 nm relating to new energy levels induced by defects or defect levels generation and confocal micro-Raman images indicated that the chemical molecular vibrational band structure and morphology of the product which is spherical shaped nanoparticles with an average particle size of ∼25 nm with standard deviation. The electrochemical response of MgO:CuO which is proves that the nano-copper/magnesium has high functionality due to the small size and it has higher electrochemical activity without any modifications. © 2015 Published by Elsevier B.V. Source

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