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Kaviyarasu K.,Materials Research Center | Kaviyarasu K.,B.S. Abdur Rahman University | Manikandan E.,B.S. Abdur Rahman University | Manikandan E.,IThemba LABS National Research Foundation NRF | And 3 more authors.
Journal of Alloys and Compounds | Year: 2014

Cadmium oxide (CdO) is a category of the practical semiconductor metal oxides, which is widely applied in various scientific and industrial fields because of its catalytic, optical, and electrical properties. CdO nanocrystal was successfully synthesized by a virtue of a single source precursor method at mild reaction conditions between cadmium oxide, and element iodine by a solvothermal route. X-ray powder diffraction (XRD), ultraviolet spectroscopy studies (UV-vis), Fourier Transform Infrared analysis (FTIR), scanning electron microscopy (SEM), μ-Raman spectroscopy and cyclic voltammogram (CV) were used to characterize the CdO nanocrystals. The ultra-violet visible absorption peaks of CdO exhibited a large blue shift and the luminescent spectra had a strong and broad emission band centered at 228 nm. The various functional groups present in the CdO nanocrystals were identified by FTIR analysis. Intense PL was also observed with some spectral tuning possibly giving a range of emission photon energies approximately spanning from 2.5 to 3.4 eV. Scanning electron microscopy and μ-Raman microscopy images indicated that the morphology of the product is spherical nanoparticles with an average particle size of 46 nm with standard deviation. The electrochemical response of CdO which is proved the nano-cadmium has high functionality due to the small size and it has higher electrochemical activity without any modifications. The above studies demonstrate the potential for the utilization of cadmium nitrite nanocrystal in visible opto-electronics applications. © 2014 Elsevier B.V. All rights reserved. Source

Manikandan E.,B.S. Abdur Rahman University | Manikandan E.,IThemba LABS National Research Foundation NRF | Kavitha G.,University of Madras | Kennedy J.,Institute of Geological & Nuclear Sciences
Ceramics International | Year: 2014

We made an attempt to form a high quality epitaxial zinc oxide, diamond-like-carbon and graphene oxide composite thin-film on device substrate p-Si(1 0 0) using third-harmonic (Nd:YAG Ultraviolet) laser at single footstep. Pulsed laser deposition (PLD) technique using 366 nm (energy∼150 mJ), vacuum 10-6 mbar has been used to grow these films in reactive gas oxygen with argon (O2|Ar) ambiance. Synthesized thin-films were investigated systematically by fingerprint technique of confocal micro-Raman and field emission studies. As synthesized pure ZnO, nanocomposite thin films like DLC/ZnO and GO/ZnO shows the enhanced field emission (F-E) performances in this present study. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved. Source

Manikandan E.,B.S. Abdur Rahman University | Manikandan E.,IThemba LABS National Research Foundation NRF | Murugan V.,University of Montreal | Kavitha G.,University of Madras | And 2 more authors.
Materials Letters | Year: 2014

Transition metal (TM) doped ZnO thin-films are increasingly being investigated for the advancement of optoelectronic devices. Functional dual TMs doping into ZnO nanostructures might influence of the charge carrier recombination rate, optical, structural and interfacial electron-transport rate performance. In this study, we demonstrated the fabrication of nanostructured thin-films of pure-ZnO, aluminium doped-ZnO (Al:ZnO or AZO) and Al with chromium doped-ZnO (Al+Cr:ZnO or ACZO) by the pulsed laser deposition (PLD). Surface morphology of prepared thin-films resembled the distinctive shapes such as (pure-ZnO) nanowires, (AZO) nanorods and (ACZO) nanoflower-like structures, respectively. Variation of structural, optical, morphological and electrical properties were characterized by glancing incidence X-ray diffraction (GIXRD), micro-Raman scattering (μ-RS), electron microscopy and transport field emission (F-E) techniques. The electron transport F-E result shows that ACZO has high conductivity than the undoped films. © 2014 Elsevier B.V. Source

Arul K.T.,Anna University | Kolanthai E.,Anna University | Manikandan E.,IThemba LABS National Research Foundation NRF | Bhalerao G.M.,Indian Department of Atomic Energy | And 5 more authors.
Materials Research Bulletin | Year: 2015

Nanocrystalline hydroxyapatite (HAp-Ca10(PO4)6(OH)2, 35 nm) and magnesium (Mg2 +) ion incorporated HAp were synthesized by microwave technique. XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy), FE-HRTEM (Field emission high resolution transmission electron microscopy), DLS (dynamic light scattering), EDXRF (energy dispersive X-ray fluorescence spectrometry), microhardness, permittivity and alternating current (ac) conductivity, besides the PL (photoluminescence), wettability and in vitro bioactivity of the samples were analysed. EDXRF revealed the Mg2+ ion incorporation in HAp. The Mg2+ ion incorporation did not alter the phase but drastically reduced the crystallite size and particle size respectively by 48% and 32%. There was enhanced microhardness (24%) at low level (<13%) and decreased zeta potential of Mg2+ ion incorporation. The permittivity, ac conductivity, PL, wettability and in vitro bioactivity were enhanced on Mg2+ ion incorporation. These properties enable them to be a promising candidate for wound healing, bone replacement applications and also as a biosensor. © 2015 Elsevier Ltd. All rights reserved. Source

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