Characterization of ZnO:Sn Nanopowders Synthesized by Co-precipitation Method (original) (raw)
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Energy Procedia, 2014
Zinc-Tin oxide compounds (Zn-Sn-O) were successfully prepared via a facile co-precipitation process using zinc dichloride dihydrate as the zinc source and tin tetrachloride pentahydrate as an additive source. The as-prepared product of Zn-Sn-O powders with various Sn additive contents (0-60 %wt) were obtained without calcinations process. The effect of Sn additive on structural and microstructure properties of the samples were characterized by X-ray diffraction(XRD), scanning electron microscope(SEM). The results indicate that the crystallinity and morphologies of ZnO nanoparticles are significantly influenced by Sn additive. The phase formations of Zn-Sn-O including ZnO, ZnSn(OH) 6 were observed depending on the Sn-additive composition.
Synthesis and study of structural properties of Sn doped ZnO nanoparticles
Materials Science Poland, 2016
Pure and Sn-doped ZnO nanostructures were synthesized by simple chemical solution method. In this method we used zinc nitrate and NaOH as precursors. Sn doping content in ZnO was taken with the ratio 0, 5, 10, 15 and 20 percent by weight. Physical properties of Sn-doped ZnO powder were studied by XRD analysis which revealed that Sn doping had a significant effect on crystalline quality, grain size, intensity, dislocation density and strain. The calculated average grain size of pure ZnO was 21 nm. The best crystalline structure was found for 0 wt.%, 5 wt.% and 10 wt.% Sn doping as observed by FESEM and XRD. However, higher Sn-doping (>10 wt.%) degraded the crystallinity and the grain size of 27.67 nm to 17.76 nm. The structures observed in FESEM images of the samples surfaces were irregular and non-homogeneous. EDX depicted no extra peak of impurity and confirmed good quality of the samples.
Acta Physica Polonica A, 2015
Pure ZnO nanopowders were synthesized by the sol-gel method, which has several advantages, among which we include, achieving low temperature deposition and synthesis of new hybrid organo-mineral materials. The eect of the elaboration conditions (the elaboration concentrations ratio of precursors (CZ/CA), the gelling temperature (Tg) and the gelling time (tg)) on the structural, morphological and luminescence properties of ZnO nanopowders has been investigated. The chemical composition of the powders, determined by FTIR spectroscopy, indicate the exclusive presence of Zn-O bonds, as it is shown by the XRD spectra. The XRD results indicate also that the synthesized ZnO powder is a solid solution, crystallizing in pure würtzite structure with a minimum grain size of about 23 nm for the powders prepared using: CZ/CA = 0.06%, Tg = 130 • C and Tg = 4 h. The morphological aspect, given by the SEM images, revealed that the powders are made of sheets, consisting of small particles agglomerated together. The photoluminescence study of the ZnO powders shows spectra with luminescence peaks from green to ultraviolet light, the more intensive emission is connected to the peaks of the blue luminescence.
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...
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.
SPECTROSCOPIC INVESTIGATIONS OF THE FORMATION OF THE Zn-Sn-O NANOSTRUCTURED FILMS
Revue Roumaine de Chimie
The aim of this work is to obtain nanostructured Zn-Sn-O films by sol-gel method. Stable solutions with Sn/Zn atomic ratio of 1:1 and 1:2 of zinc and tin, respectively, were obtained starting from Sn(II) 2-ethylhexanoate and zinc acetate dehydrate in ethylic absolute alcohol and triethanolamine. Solutions which contain both tin and zinc cations exhibit fluorescence emission even after four days storage. The obtained powders are amorphous. Mono-and multi-layer films were deposited on glass and silicon substrates. A beginning of crystallization of Zn 2 SnO 4 can be seen by XRD in the case of films with Sn/Zn atomic ratio of 1:2. The surface topography of the films was estimated by AFM. The refractive index values in the 1.6-2.3 range were calculated from Spectroellipsometry data using Cauchy Model. Fluorescence emission was observed in the case of studied films excepting tin dioxide. The structure, morphology and optical properties of the obtained films depend on the composition, number of deposition and the thermal treatment temperature.
Structural and Optical Properties of Nanocrystalline Zn–Ce Doped SnO2 by Co-Precipitation Method
Nanocrystalline tin dioxide (SnO2) doped with by Zn and Ce were synthesized via chemical coprecipitation method. The SnO2 crystallites were found to exhibit tetragonal rutile structure and the values of lattice parameters show that the metal ions get substituted in the SnO2 lattice. The samples were characterized by powder X-ray diffraction (XRD). The XRD data showed that all the samples are of single phase (tetragonal) and the crystallite size is found to be in the range of 6 –15 nm. The lattice constants (a & c) and a/c ratio along with cell volume were also calculated from XRD data. The characterization of the sample using Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR) and Photoluminescence (PL) techniques discussed in detail in order to know the suitability of the material for energy applications.
2013
Nanocomposite ZnO : SnO2 and pervoskite ZnSnO3 nanoparticles were synthesized with different volume ratios [40 : 60 (wt %), 50 : 50 (wt %), 60 : 40 (wt %), 70 : 30 (wt %) and 30 : 70 (wt %) respectively] have been deposited by spray pyrolysis technique on glass substrate using an aqueous solution of Zinc chloride (0.1 M) and Stannic chloride (0.1 M) at a substrate temperature 400 5 C. The structural, surface morphological and optical characterizations of the as-prepared samples were carried out using XRD, SEM, TEM and UV-VIS spectrophotometer, respectively. The XRD result showed nanostructured pervoskite thin films of ZnSnO3 and composite of ZnO : SnO2. The volume ratio of zinc chloride and stannic chloride when varied, the particle size was found increasing where as particle shape changed from circular to hexagonal. The X-ray diffraction spectroscopy results indicated that all the samples had the good crystallinity. The ultraviolet-visible absorption spectra showed increased band g...
Synthesis and characterization of ZnO nanopowder by non-basic route
Digest Journal of Nanomaterials and Biostructures
Nanocrystalline ZnO particles were prepared from methanolic solutions of zinc acetate dihydrate without using base such as NaOH or LiOH through a colloid process carried out at a low temperature of 60 o C. The precipitate obtained after 12-72h contained ZnO, covered with polymeric species of zinc hydroxo acetate. The reaction course was studied by mass spectrometry means. To complete the hydrolysis process, up to pure ZnO, it was necessarily to reflux the white precipitate separate from methanolic solution, in water at 80 o C. We found that reaction time in the presence of methanol primarily influenced the size of the particles, while the reaction time in the presence of water mainly influenced the ZnO purity.