Structural and optical characteristic of chalcone doped ZnO nanoparticles (original) (raw)
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NanoNEXT, 2021
The purpose of this paper is to investigate the structural and optical characteristics of 1-(4-Methylsulfonyl Phenyl)-3-(4-n, n Dimethyl (amino Phenyl)-2-Propen- 1-One (MSPPP) Chalcone doped in ZnO nanoparticles. Part of the aim is to study the characterization of chalcone doped ZnO nanoparticles by several techniques such as X-ray diffraction, Scanning electron microscope, FTIR spectroscopy, and diffuse reflection spectra. All doped samples showed a hexagonal wurtzite structure. This study has shown that the crystallite size of pure ZnO varied from 23.50 to 27.45 nm and when increasing the chalcone percentage by 0.5 and 1.5%, has increased the crystallite sizes in the range of 33.40–33.80 nm and 33.80–36.20 nm, respectively. The value of the energy gap (Eg) for ZnO nanoparticles was 3.14 eV. For 0.5 and 1.5% chalcone doped ZnO, the energy gap decreased by an order of magnitude 0.16 eV.
Structural and optical characterization of Sm-doped ZnO nanoparticles
Bulletin of Materials Science, 2019
Micro-structural changes in zinc oxide (ZnO) nanoparticles induced by the substitution of Zn 2+ in ZnO by a rare earth (RE) metal ion, Sm 3+ , are investigated. Both pristine and Sm-doped ZnO with a nominal doping concentration of 1, 2 and 4% of Sm using a simple wet-chemical synthetic route followed by calcination at a high temperature of 900 • C, are synthesized. Structural investigations are primarily conducted using X-ray powder diffraction (XRPD) and scanning electron microscopy techniques. Evolution of structural parameters (unit cell parameters, average crystallite size, crystallinity percentage, lattice strain, stress, energy density and atomic packing factor) upon Sm doping is investigated together with Rietveld refinement and Le Bail analysis techniques. XRPD data confirmed that the synthesized nanostructures crystallize in a wurtzite hexagonal structure, the dopant Sm is incorporated into the Zn lattice and the annealing treatment plays a crucial role in determining the structural and optical properties of RE-metal-doped nanoparticles. Values of the optical band gap energy estimated from optical absorbance measurements reveal a widening of the band gap.
Structural and Optical Properties of Cu Doped ZnO Nanoparticles
In this paper, different characterization techniques are employed to study the effects of copper doping on the structural and optical properties of zinc oxide (ZnO) nanoparticles synthesized by solvothermal method using domestic microwave oven. The X-Ray Diffraction (XRD) pattern indicates that the synthesized samples have a single phase wurtzite hexagonal structure of ZnO. The particle size calculated using Debye Scherrer’s formula is also confirmed by Transmission Electron Microscope (TEM) studies. Scanning Electron Microscope (SEM) studies confirm uniform distribution of the samples and the elements present in the samples have been recorded by Electron Diffraction X-Ray (EDX) spectroscopy. The functional group of the samples has been confirmed by Fourier Transform Infra-Red (FTIR) analysis. UV-Visible (UV-Vis) spectrum shows a red shift in the absorption edge due to the incorporation of Cu2+ ions into ZnO lattice. A weak ultraviolet peak related to near band edge emission and a prominent peak corresponding to defect related visible emission are seen in the Photoluminescence (PL) spectra.
Applied Physics A, 2013
We studied structural, optical and vibrational properties of K-doped ZnO nanostructures. X-ray diffraction studies reveal that the prepared particles are hexagonal wurtzite in structure. Increase in lattice parameters and unit cell volume is observed after K doping. Dopant influences on stress, strain of the system are studied using W-H plots. Band gap variation by doping of K is identified from optical absorption studies. Photoluminescence studies have given insight into the enhancement in blue emission observed by K doping along with the near band emission of nano ZnO. From Fourier transform infrared spectral measurements, K-related local vibration mode is observed along with the information related to influence of doping on characteristic vibrational modes of ZnO.
An Empirical Study on Structural, Optical and Electronic Properties of ZnO Nanoparticles
In this work, the synthesis routes for zinc oxide (ZnO) nanoparticles and optical & electronic properties of ZnO nanoparticles have been demonstrated. ZnO has many potential applications including sunscreens, biosensors, food additives, pigments, rubber manufacture, and electronic materials. Because of the unique quantum confinement effects of ZnO nanoparticles, synthesis and characterization of ZnO nanoparticles has been received a great attention in contemporary materials science. The synthesized ZnO materials can be further characterized by many characterization techniques in order to confirm synthesis. In this case, X-ray diffraction (XRD is a very powerful tool to analyse the structure of the material. Surface characterization such as Scanning Electron Microscopy (SEM) and Transmission electron microscopy (TEM)could be very useful to understand the morphology of the nanoparticles. Also, Fourier transform infrared spectroscopy (FTIR) is helpful to identify particular chemical bonding in the synthesized materials. Thermal stability and thermal transition can be measured by thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC), respectively. The optical properties of ZnO nanoparticles can be measured by UV-VIS spectroscopy.
Applied Nanoscience, 2019
We have analysed the effect of co-doping Rare Earth (Ce) and Transition metal (Co) on optical properties in ZnO nanoparticles. We have prepared 1 at %, 2 at % and 3 at % Ce and Co co-doped ZnO nanoparticles annealed at 600 °C, 700 °C, and 800 °C temperatures by simple sol-gel method using ethanol as a solvent. The structural and morphological properties were characterized by XRD (X-ray Diffraction), RAMAN and SEM (Scanning Electron Microscopy), respectively. All the prepared samples were polycrystalline and wurtzite in structure, showing that Ce and Co have been successfully incorporated into the wurtzite crystal structure of ZnO. Particles were uniformly distributed and the calculated average crystallite size was in the range of 50-100 nm. There was no large shift in the XRD spectra. For optical properties PL (Photoluminescence) spectroscopic and UV-Visible spectroscopic techniques were used. We have obtained two sharp peaks in the PL spectra nearly at 510 and 612 nm. 510 nm emission may be due to trap-state, deep-level emission, whereas, 612 nm emission was due to either charge transfer (CT) transition between O −2 and Ce +4 ion. These two emission peaks were stable with respect to doping concentration upto 2%. The results show that this method produce perfectly co-doped ZnO nanoparticles having sharp emission spectra, so that we can use these materials in LEDs and photodetectors.
CrystEngComm, 2012
At the forefront of the current scientific revolution of nanoscience nanocrystals (NCs), crystalline particles grown in liquid media, stand out over other classes of inorganic nanomaterials due to the high degree of control with which their crystal structure, size, shape, and surface functionalities can be engineered in the synthesis stage and to the versatility with which they can be processed and implemented into a large spectrum of devices and processes. Doped semiconductor nanostructures can yield both high luminescence efficiencies and lifetime shortening at the same time. In the present manuscript pure and Cr-doped ZnO nanoparticles were successfully synthesized from the solution phase chemistry and investigated with respect to their structural and optical properties. The resulting powder consisting of nanocrystalline particles were characterized by X-ray diffraction (XRD), UV-Visible spectroscopy, photoluminescence spectroscopy, transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray analysis (EDX) techniques. A UV emission peak was observed from the exciton transition at 380 nm in the room temperature photo luminescent (PL) spectra. The blue emission band was assigned to the Zn interstitial and vacancy level transition. Even though Cr ions are known to act as an efficient non-radiative loss centre for near band gap emission (NBE), a pronounced NBE is obtained at room temperature even for a nominal Cr concentration of 8 at. %. XRD data analysis shows that the chromium dopant atoms are incorporated into the wurtzite host lattice. The grain size decreases with increasing dopant concentration. The lattice constants extracted by the Rietveld method from XRD data vary slightly with doping concentration.
Structural and Optical Properties of Zno Nano Particles
IOSR Journal of Applied Physics, 2014
In the present report preliminary studies on synthesis and growth of ZnO nanocrystals have been reported. ZnO precursors were prepared by precipitation method from Zinc nitrate and Ammonia in aqueous solutions at a pH value9.0 .ZnO nanocrystals were then synthesized by heating the precursor in a muffle furnace at temp 350°C for 3 hours and allowed to cool to room temperature. The precursors and synthesized nanoparticles were characterized by X-Ray diffraction (XRD) and the results showed a single phase wurtzite structure for ZnO nanoparticles. It was found that the synthesized ZnO nanocrystals have wurtzite structures with a=b=3.214 Å and c=5.154 Å. Crystallite size was calculated using Debye_Scherrer's equation and the average crystallite size from first three peaks was found to be 55.18 nm. The morphology of prepared ZnO nanopowders was characterized by scanning electron microscope (SEM). From the compositional analysis by Energy dispersive analysis of X-ray (EDX) it was confirmed that Zinc and oxygen are present in the sample. Optical characterization was done to study other characters. Diffuse reflectance spectroscopy (DRS) results shows that the band gap of ZnO nanoparticles is 3.20eV.
Structural and optical properties of pure and Al doped ZnO nanocrystals
Pure and Al doped zinc oxide (ZnO) were prepared by co-precipitation method. The dopant concentration [Al/Zn in atomic percentage (wt%)] was varied from 0 to 3 wt%. Structural characterisation of the samples performed with XRD and SEM–EDAX confirmed that polycrystalline nature of samples containing ZnO nanoparticles of size in the range of 97–47 nm. UV–Vis studies showed that the absorbance peaks, observed in the wavelength range of 800–250 nm, decreased with the increase in dopant concentration indicating widening of the band gap. The calculations of band gap (analyzed in terms of Burstein–Moss shift) from the reflectance showed an increase from 3.37 to 3.49 eV with increasing Al concentration.