Nanomaterials & Nanotechnology
Parvathy Bhaskar; Veena M G; Madhukar B S
Abstract
Pure and rare earth metal [cerium (Ce) and thorium (Th)-doped zinc oxide (ZnO)] nanostructures were prepared by solution combustion synthesis by making use of metal nitrates and glycine as precursors in alkaline medium. The average crystal size was examined using Powder X-Ray Diffraction (PXRD) which ...
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Pure and rare earth metal [cerium (Ce) and thorium (Th)-doped zinc oxide (ZnO)] nanostructures were prepared by solution combustion synthesis by making use of metal nitrates and glycine as precursors in alkaline medium. The average crystal size was examined using Powder X-Ray Diffraction (PXRD) which showed sizes of 45 nm for pure ZnO sample,17.9 nm and 20 nm for Ce and Th-doped ZnO samples respectively. Accordingly, the synthesized samples were confirmed to be polycrystalline from High-Resolution Transmission Electron Microscopy (HRTEM), Selected Area Electron Diffraction (SAED) and X-Ray Diffraction (XRD) analyses. Field Emission Scanning Electron Microscopy coupled with Energy Dispersive X-Ray Spectroscopy (FESEM / EDX) confirmed the existence of the respective components in the synthesized samples. The Ultra Violet – Visible - Near Infra-Red (UV – Vis - NIR) Spectroscopy showed the characteristic absorption spectra of the samples. The surface topography of the prepared samples was studied by Atomic Force Microscopy (AFM). To further confirm the chemical composition and binding energy, X-Ray Photoelectron Spectroscopy (XPS) was employed.
K. K. Satapathy;F. Khan
Abstract
The mechanoluminescence (ML) of γ-irradiated Anchor ZnAl2O4: Dy phosphor has been studied. ZnAl2O4 samples having different concentrations of Dy were prepared by solution combustion technique by using hydrazine as a fuel. ML was excited impulsively by dropping a load onto the sample. Two distinct ...
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The mechanoluminescence (ML) of γ-irradiated Anchor ZnAl2O4: Dy phosphor has been studied. ZnAl2O4 samples having different concentrations of Dy were prepared by solution combustion technique by using hydrazine as a fuel. ML was excited impulsively by dropping a load onto the sample. Two distinct peaks have been observed in the ML intensity versus time curve. Maximum intensity is obtained for 0.1 mol% of Dy doped ZnAl2O4 phosphor. ML spectra of the phosphors show two distinct peaks around 482 nm and 585 nm which is characteristic emission of Dy 3+ . It is also observed that the ML intensity of the samples increases almost linearly with increasing mass of the sample and gamma ray doses given to the sample. Experimental results suggest that the ML excitation is related to the movement of dislocation with defect centres and it may be used for dosimeter applications.
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