Synthesis and study of structural properties of Sn doped ZnO nanoparticles (original) (raw)
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SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF ZnO NANOPARTICLES
Herald of Khmelnytskyi National University. Technical sciences
In the present work, zinc oxide (ZnO) nanoparticles were synthesized by direct precipitation method in aqueous solution using zinc acetate dihydrate and sodium hydroxide as precursors. The molar ratio of Zn2+ to OH– was 1:2. The obtained precipitated compound was treated at different temperatures. The crystal phase and structural parameters of each prepared ZnO samples such as interplanar spacing, crystallite size, dislocation density, micro strain were determined by X-ray diffraction (XRD) analysis for different crystallographic planes. Other crystallite parameters such as lattice constants, unit cell volume, Zn–O bond length, crystallinity of synthesized ZnO samples also were calculated from the XRD data. The XRD patterns show the successfully synthetized ZnO phase with wurtzite hexagonal structure and average crystallite sizes of 24.6 nm, 25.6 nm and 28.1 nm for the samples that dried at room temperature without heat treatment (S1), dried at 60°C without calcination (S2), dried a...
Characterization of ZnO:Sn Nanopowders Synthesized by Co-precipitation Method
Energy Procedia, 2014
ZnO:Sn nanopowders were synthesized by co-precipitation method using zinc acetate dihydrate and tin (IV) chloride hexahydrate as a precursors. Co-precipitate of ZnO:Sn nanopowders with various Sn additive 0-50 %wt were obtained by calcination process at 500 C. The corresponding functional groups and chemical bonding of the samples were investigated by Fourier Transform Infrared Spectroscopy (FTIR). The effects of Sn addition on structural and morphological properties of ZnO:Sn nanopowders have been investigated by X-ray diffraction (XRD), Raman Spectroscopy (Raman) and Scanning electron microscopy (SEM). The chemical bonding of Zn-O, Sn-O and Sn-OH in ZnO:Sn nanopowders were observed by FTIR results. The phase formation of this coumpound was observed with increasing Sn content with calcined at 500 C. These results indicate that the crystallinity and structural of ZnO nanopowders are significantly affected by Sn dopant.
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.
Nanoparticles of ZnO Doped With Mn: Structural and Morphological Characteristics
Materials Research
In this study, the effects of dopant concentrations on the structural and morphological characteristics of Zn 1-x Mn x O powders (x= 0.025, 0.05, 0.075, and 0.1 mole) synthesized by the Pechini method has been investigated. The powder was characterized by X-ray diffraction (XRD), Brunauer-Emmet-Teller (BET) specific surface, energy dispersive X-ray (EDX), scanning electron microscopy (SEM) and Spectroscopy with Fourier transform (FTIR). An XRD analysis of the powder showed the formation of ZnO phase with a typical single phase wurtzite structure. The EDX analysis revealed Mn incorporated in the ZnO structure. The particle size calculated by BET ranged from 24 to 63 nm, confirming the nanometric size of the powder particles. The SEM analysis revealed irregular shaped particle agglomerates and the presence of nanosheets. From FTIR it was confirmed the wurtzite structure in ZnO and ZnO nanoparticles doped with Mn.
Preparation and Characterisation of Pure and Zn-doped SnO2 Nanoparticles
In this report,Pure and Zn-doped SnO2 nano powders were synthesized by co-precipitation method. The structure, surface morphology, optical, and functional groups were analyzed by X-ray diffraction, Field Emission Scanning Electron Microscope(FESEM), UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), photoluminescence spectra, Energy Dispersive Spectroscopy(EDAX) and cyclic voltammetric method, respectively. The results were compared with pure tin oxide nanoparticle. X-ray analysis shows that the obtained power has tetragonal rutile type structure with average crystallite size of 34 nm which reduced to 9 nm with Zn addition. Increase in band gap is observed from UV-Vis spectroscopy by the addition of zinc in SnO2. PL spectrum of the pure and doped samples detected two strong emission peaks at 437nm, 465nm due to the surface defect and oxygen vacancies in SnO2 nanoparticles. The electrochemical nature of the samples has been studied using cyclic voltammetric method.Thus the co-precipitation method is convenient, easy, simple, low cost and effective synthesis of nanoparticles.
Zn-doped SnO 2 nanostructures: structural, morphological and spectroscopic properties
SnO2 is a promising material for optoelectronic, catalytic and sensing applications and is highly sensitive to the small amount of impurities that can change its properties drastically. In the present work, co-precipitation method was employed to synthesize pure and Zn-doped SnO2 nanostructures. The effect of Zn doping (1, 3 and 5% molar ratio) on crystallographic and spectroscopic properties of SnO2 nanostructures has been studied. The X-ray diffraction results revealed that SnO2 possesses tetragonal rutile crystal structure with predominant (110) plane and the same structure was retained after doping with Zn. Raman shifts also confirmed the typical feature of the tetragonal rutile phase in all samples. Fourier transform infrared spectra revealed stretching mode of Sn–O bond and vibrational mode of O–Sn–O bond complementing the Raman spectroscopy results. Field emission scanning electron micrographs confirmed the variation in morphology of synthesized samples with Zn-dopant concentration. Highresolution transmission electron micrographs showed that the synthesized nanostructures were nearly spherical and average particle size varies between ~20–26 nm. UV–Visible results revealed that the band gap of the synthesizedSnO2 nanoparticles increased with increase in Zn content. Photoluminescence spectroscopic results showed that emission intensity increased with increase in Zn content. The increased intensity of emission peaks may be ascribed to the development of defect states in the band gap of Zn-doped SnO2 nanoparticles.
Materials Research, 2016
Zinc doped Tin oxide (SnO 2) nanoparticles were prepared by co-precipitation method. The average crystallite size of pure and Zn-doped SnO 2 nanoparticles was calculated from the X-ray diffraction (XRD) pattern. The FT-IR spectrum indicated the strong presence of SnO 2 nanoparticles. The morphology and the particle size were studied using the scanning electron microscope (SEM) and transmission electron microscope (TEM). The particle size of the Zn-doped SnO 2 nanoparticles was also analyzed, using the Dynamic Light Scattering (DLS) experiment. The optical properties were studied by the UV-Visible absorption spectrum. The dielectric properties of Zn-doped SnO 2 nanoparticles were studied at different frequencies and temperatures. The ac conductivity of Zn-doped SnO 2 nanoparticles was also studied.
Preparation and Study of morphological properties of ZnO nano Powder
The Journal of Engineering, 2016
In this work, ZnO nanostructures for powder ZnO were synthesized by Hydrothermal Method. Size and shape of ZnO nanostructureas can be controlled by change ammonia concentration. In the preparation of ZnO nanostructure, zinc nitrate hexahydrate [Zn(NO3)2·6H2O] was used as a precursor. The structure and morphology of ZnO nanostructure have been characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD). The synthesized ZnO nanostructures have a hexagonal wurtzite structure. Also using Zeta potential and Particle Size Analyzers and size distribution of the ZnO powder
Superlattices and Microstructures, 2018
Undoped and Sn doped Zinc oxide nanorods were prepared by two step process: initially growth of seed layers by sol-gel spin coating technique and then zinc oxide nanorods by hydrothermal process using the precursors zinc nitrate hexahydrate, hexamine and tin chloride. The effects on the electrical, optical, mechanical and structural properties for various Sn concentrations were studied. The crystalline phase determination from X-ray diffraction (XRD) confirms that Sn doped ZnO nanorods have hexagonal wurtzite structure. The variations of stress and strain with different doping concentration of Sn in ZnO nanorods were studied. The doping effect on electrical properties and optical bandgap is estimated by current voltage characteristics and absorbance spectra respectively. The surface morphology was studied with field emission scanning electron microscope (FESEM), which shows that the formation of hexagonal nanorods arrays with increasing Sn concentration. The calculated value of Young's modulus of elasticity (Y) for all the samples remains same. These results can be used in optoelectronic devices.
Journal of Physics D-applied Physics, 2007
ZnO is a unique material that offers about a dozen different application possibilities. In spite of the fact that the ZnO lattice is amenable to metal ion doping (3d and 4f), the physics of doping in ZnO is not completely understood. This paper presents a review of previous research works on ZnO and also highlights results of our research activities on ZnO. The review pertains to the work on Al and Mg doping for conductivity and band gap tuning in ZnO followed by a report on transition metal (TM) ion doped ZnO. This review also highlights the work on the transport and optical studies of TM ion doped ZnO, nanostructured growth (ZnO polycrystalline and thin films) by different methods and the formation of unique nano-and microstructures obtained by pulsed laser deposition and chemical methods. This is followed by results on ZnO encapsulated Fe 3 O 4 nanoparticles that show promising trends suitable for various applications. We have also reviewed the non-linear characteristic studies of ZnO based heterostructures followed by an analysis on the work carried out on ZnO based phosphors, which include mainly the nanocrystalline ZnO encapsulated SiO 2 , a new class of phosphor that is suitable for white light emission.