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Improved Photocatalytic Properties of NiS Nanocomposites Prepared by Displacement Method for Removal of Rose Bengal Dye
摘要： Objective: The present work describes NiS nanoparticles were prepared by chemical displacement method using CTAB as a stabilizer. Method: For the source of Sulfide ion, we used thioacetamide as fuel and nickel nitrate as metal salt. NiS nanoparticles are p-type semiconductor. Band gap of NiS is 0.5- 0.6 eV and also reported to be a good photo catalyst in the degradation of pollutants. The structural, morphological, metal percentage and optical properties of as synthesized nanoparticles are investigated by using X-ray diffraction (XRD), UV-Visible spectra; Field emission gun scanning electron microscopy (FEG-SEM) with EDS, Fourier transforms infrared spectroscopy (FTIR), High-resolution transmission electron microscopy (HR-TEM) and Photoluminescence spectroscopy (PL). Results: The x-ray diffraction patterns revealed that the particles exhibited a crystal structure at the suitable temperature. The average particle size of the nanoparticles from the X-ray diffraction is about 22.8 nm and also Field emission gun scanning electron microscopy shows good morphology and exhibited clearly hexagonal shape. Conclusion: The Transmission electron microscopy (HR-TEM) shows the crystalline size of structures is 22 nm. Further, the Photocatalytic activity of Synthesized NiS nanoparticles was investigated by photo catalytic removal of Rose Bengal as a model of organic pollutant. It shows good photocatalytic activity against Rose Bengal dye (98.1%).
关键词： Nanoparticles,UV-Vis,FEG-SEM,EDAX,XRD,FTIR,HR-TEM,nickel sulfide
更新于2025-09-23 15:22:29
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Photometric features and typical white light emanation via combustion derived trivalent dysprosium doped ternary aluminate oxide based nanophosphor for WLEDs
摘要： Trivalent dysprosium doped ternary aluminate oxide based SrGd2Al2O7 nanocrystalline phosphors were synthesized via an efficient single step solution combustion process. The estimated value of optical band gap energy for the optimized nanophosphor and host matrix were found to be 5.58 eV and 5.76 eV respectively. Diverse crystalline features were elucidated via analyzing PXRD patterns and Rietveld refined results of host matrix and optimal SrGd1.94Dy0.06Al2O7 nanophosphor. Diverse elements present in the optimized nanophosphor were found to be Sr, Gd, Dy, Al and O as revealed via energy diffraction X-ray analysis (EDAX). The surface morphological features and the particle size of the optimum nanosample were disclosed by scanning electron microscope (SEM) and transmission electron microscope (TEM) practices. The characteristic emission spectra recorded using excitation wavelength of 350 nm display two strong peaks at 484 nm and 578 nm that were allotted to 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 respective transitions. The evaluated critical distance value was ensured to be much higher than 5 ? indicating no chance of occurrence of concentration quenching (CQ) as a result of exchange interactions amongst dopant ions. Dipole-dipole interactions in the midst of adjoining Dy3+ ions were observed to be an appropriate cause for following CQ trend. Based on outcomes of Correlated Color Temperature (CCT) and International Commission on Illumination (CIE), it was quite obvious that the prepared nanomaterial will prove to be absolutely beneficial for applications related to lightning and display systems. Thus, it can be concluded that a new window opens for white light emitting diode (WLED) applications using the synthesized nanophosphors.
关键词： PXRD,Nanocystalline phosphor,Crystal configuration,EDAX,Dy3+
更新于2025-09-11 14:15:04
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Fabrication and analysis of the structural phase transition of ZrO <sub/>2</sub> nanoparticles using modified facile sol–gel route
摘要： The synthesis of zirconia nanoparticles is achieved through a modified facile sol–gel route. The as-prepared gel is analyzed thermally using TGA and DTA techniques to spot the crystallization process of zirconia nanoparticles. The prepared gel is then annealed at different temperatures and the structure was found to change between tetragonal and monoclinic crystal systems. The first stable tetragonal phase is achieved after annealing for 2 h at 400°C. The annealed powders between 600°C and 800°C demonstrate mixed tetragonal/monoclinic phases. Annealing at 1000°C and higher temperatures up to 1200°C resulted in pure monoclinic phase. Cubic phase was not detected within the annealing temperature range in this study. The elemental analysis of the annealed powder confirmed the formation of zirconia nanoparticles with the chemical formula ZrO2. The FTIR spectra of the annealed samples introduced a variation in the vibrational bands especially around the phase transition temperature. HR-TEM images reported the formation of nano-zirconia crystals with apparently large particle sizes. The optical energy gap of zirconia nanoparticles is investigated and determined.
关键词： ZrO2 nanoparticles,HR-TEM,sol–gel synthesis,EDAX,optical energy gap
更新于2025-09-09 09:28:46
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Effect of Temperature on Shape & Optical Properties of MgO/ZnO Nanocomposites
摘要： MgO/ZnO nanocomposites were synthesized by mixing magnesium acetate tetrahydrate and zinc acetate in the equimolar ratio through a simple reflux method. The refluxed sample was annealed at three different temperatures 400, 500 and 600 oC, respectively. X-ray diffraction spectra (XRD) showed wurtzite ZnO structure with cubic MgO. The HR-SEM picture showed the rod shaped morphology at 400 °C and morphology changed to spherical shape with the increase in temperature to 600 °C. Williamson-Hall plot is used to study the particle size and micro strain of the synthesized MgO/ZnO nanocomposites. The band gap and luminescent property were investigated using ultra violet-visible and photoluminescence spectra. The optical property of MgO/ZnO nanocomposites depends on the annealing temperature which is shown by the increase in the band gap as temperature increases.
关键词： MgO-ZnO nanocomposites,EDAX,Ultra violet-visible,Photoluminescence,HRSEM
更新于2025-09-09 09:28:46