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Ambikāpur, India

Singh A.,Surguja University | Vishwakarma H.L.,Surguja University
Materials Science- Poland | Year: 2015

In this work, zinc oxide (ZnO) nanorods were obtained by a simple chemical precipitation method in the presence of capping agent: polyvinyl pyrrolidone (PVP) at room temperature. X-ray diffraction (XRD) result indicates that the synthesized undoped ZnO nanorods have hexagonal wurtzite structure without any impurities. It has been observed that the growth direction of the prepared ZnO nanorods is [1 0 1]. XRD analysis revealed that the nanorods have the crystallite size of 49 nm. Crystallite size is calculated by Debye-Scherrer formula and lattice strain is calculated by Williomson-Hall equation. Cell volume, Lorentz factor, Lorentz polarization factor, bond length, texture coefficient, lattice constants and dislocation density have also been studied. We also compared the interplanar spacings and relative peak intensities with their standard values at different angles. The scanning electron microscope (SEM) images confirmed the size and shape of these nanorods. It has been found that the diameter of the nanorods ranges from 1.52 μm to 1.61 μm and the length is about 4.89 μm. It has also been observed that at room temperature ultraviolet visible (UV-Vis) absorption band is around 355 nm (blue shifted as compared to the bulk). The average particle size has also been calculated by mathematical model of effective mass approximation equation, using UV-Vis absorption peak. Finally, the bandgap has been calculated using UV-absorption peak. Electroluminescence (EL) studies show that emission of light is possible at very small threshold voltage and it increases rapidly with increasing applied voltage. It is seen that smaller ZnO nanoparticles give higher electroluminescence brightness starting at lower threshold voltage. The brightness is also affected by increasing the frequency of AC signal. © 2015 Wroclaw University of Technology. Source


Dey S.,Indian School of Mines | Kumar A.,Indian School of Mines | Sain D.,Indian School of Mines | Nayek H.P.,Indian School of Mines | And 5 more authors.
Letters in Organic Chemistry | Year: 2015

Four organic compounds, N1, N4-bis(6-methylpyridin-2-yl)terephthalamide (1), its di-Noxide (3), mono-N-oxide with water (5w) and di-N-oxide (6) of N1, N3-bis(6-methylpyridin-2-yl) (4) have been synthesized and their solid state structures have also been determined using FTIR, NMR, Mass and single crystal X-ray analysis. Three dimensional propagations, conventional and nonconventional hydrogen bonding with their point of interactions, molecular modeling and Hirshfeld surface analysis are discussed in this context. © 2015 Bentham Science Publishers. Source

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