Synthesis and characterization of ZnO nanostructures with varying morphology (original) (raw)

SYNTHESIS OF ZINC OXIDE NANOPARTICLES BY PRECIPITATION METHOD AND SIMPLE HEATING METHOD

The spherical zinc oxide nanoparticles were successfully synthesized by alkaline precipitation technique from zinc acetate dihydrate and sodium hydroxide using triethanolamine (TEA) as surface active agent in order to obtain the particles more spherical. The spherical ZnO nanoparticles with the range from 150 nm to 300 nm were observed from this method. For comparison, a simple heating of zinc acetate dehydrate precursor by adding various contents of poly ethylene glycol (PEG) was carried out to prepare the uniform, hexagonal shape and dispersed zinc oxide nanoparticles with narrow size distribution. The morphologies of prepared zinc oxide nanoparticles were determined by scanning electron microscope (SEM). The elemental composition of zinc oxide nanoparticles was carried out by SEM attached Energy Dispersive X-ray Diffractometer (EDX) and the crystallization phase structures were studied by X-ray diffraction (XRD).

Synthesis and microstructural properties of ZnO nanoparticles prepared by precipitation method

Renewable Energy, 2013

In this work, zinc oxide (ZnO) precursor was prepared by precipitation method from zinc nitrate and ammonium carbonate in aqueous solutions. ZnO nanoparticles were synthesized by annealing the precursor at different temperatures. The effect of the annealing temperature on the particle size and photo-luminescence (PL) properties of the synthesized ZnO nanoparticles were studied by XRD, SEM, BET, TG-DTA and PL measurements. The XRD results indicated that the synthesized ZnO nanoparticles had the pure wurtzite structure. It is found that with increasing the annealing temperature the crystalinity and particle size increases as well as the lattice parameters approaches to those of the XRD standard. The studies of the aggregation of the samples were also carried out by comparing SEM micrographs with specific surface measurements and XRD results. Finally, the room temperature PL spectra show UV emission peak in the range of 378.50e379.80 nm, which is close to the bulk ZnO.

Varying the microstructural properties of ZnO particles using different synthesis routes

Journal of Molecular Structure, 2011

The hydrolysis at 90°C of zinc acetylacetonate [Zn(acac) 2 ] in solutions containing sodium hydroxide and trisodium citrate was monitored using Raman and FT-IR spectroscopies and field emission scanning electron microscopy. The size and shape of the precipitated particles depended on the initial mole ratio [Zn(acac) 2 ]/[Na 3-citrate] and initial NaOH concentration. The conditions for precipitation of square platelike particles or thin foils were determined. Nanosize ZnO particles of good uniformity were obtained by heating square plate-like particles or thin foils at 300°C. With additional heating at 600°C larger particles were obtained. These particles showed the Raman bands at 332, 384, 413, 438, 540 and 583 cm À1 , which were assigned to wurtzite-type ZnO. For the initial mole ratio [Zn(acac) 2 ]/[Na 3-citrate] = 1:0.5 and at concentration of 1 Â 10 À2 M NaOH the ZnO particles of different shapes were obtained which consisted of primary nanosize particles with chemically bonded citrate groups.

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...

Preparation and Characterisation of ZnO Nanoparticles

2016

In this work, spherically shaped ZnO nanoparticles of size around 100 nm have been synthesized by sol gel process using zinc acetate dehydrate and sodium hydroxide as starting materials at room temperature. Surface morphology and microstructural characterization of the particles are carried out using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), particle size analysis by dynamic light scattering (DLS), grain size and crystal structure using X-ray diffractometer (XRD) and Fourier transform infrared spectroscopy (FTIR). The X-ray diffraction results indicated that the synthesized ZnO particles are of single phase and the average particle sizes were about 100 nm. The synthesized nanoparticles could be applied in the treatment of industrial waste water.

Literature Review on Synthesis of ZnO Nano.pdf

Nowadays many efforts have been made for achieving ZnO Nanoparticles through the various approaches to obtain desired shapes. The present paper discussed about these methods such as Microemulsions, molucualr beamepitaxcy, spray pyrolysis, common thermal evaporation, and chemical varour methods. The present paper portrays a brief review of the methods that have been used for synthesize and characterizes Zinc Oxide nanoparticals

Synthesis of ZnO Nanostructures Using Sol-Gel Method

Procedia Chemistry, 2016

Zinc oxide plays an important role in current industry due to its special characteristics such as anti-corrosion, anti-bacteria, has low electrons conductivity and excellent heat resistance. Therefore, the objective of this study is to synthesize zinc oxide nanostructures with the most practical ways by using sol-gel method and characterize the nanostructures. Sol-gel method is the simplest method and has the ability to control the particle size and morphology through systematic monitoring of reaction parameters. ZnO nanoparticles were synthesized via sol gel method using Zinc acetate dehydrate (Zn(CH3COO)2.2H2O) as a precursor and ethanol (CH2COOH) was used as solvent, Sodium hydroxide (NaOH) and distilled water were used as medium. ZnO nanoparticles were characterized by using XRD, EDX, FESEM, and nano-particles analyser. Result of EDX characterization shows that the ZnO nanoparticles has good purity with (Zinc content of-55.38% and; Oxygen content of-44.62%). XRD result spectrum displays mainly oxygen and zinc peaks, which indicate the crystallinity in nature as exhibited. FESEM micrographs shows that synthesized ZnO have a rod-like structure. The obtained ZnO nanoparticles are homogenous and consistent in size which corresponds to the XRD result that exhibit good crystallinity. ZnO nanoparticles were successfully synthesized by sol-gel method in nanosize range within 81.28nm to 84.98nm.

Effect of PH Variation on Particle Size and Purity of Nano Zinc Oxide Synthesized by Sol-Gel Method

2012

In recent years, there have been many methods developed to synthesize Zinc Oxide (ZnO) nanoparticles. Nevertheless, a simple yet cheap method to prepare single crystal with high purity nano ZnO was still yet to be established. In this research, nano Zinc oxide (ZnO) was prepared by sol-gel method. The pH variation effect to the resulting ZnO product was also observed. (CH3COOH)2Zn.2H2O powder and NaOH solution were used as precursors. NaOH solution was added to (CH3COOH)2Zn.2H2O solution by titration until colloids with different pH were obtained, then precipitates of nano ZnO were formed. From the precipitation profile, it can be observed that increasing pH led to shortened precipitation time, which also means increasing particle size. It was also further confirmed that particle size at pH 7 and pH 12 was 1.3 nm an d 73.8 nm, respectively. XRD profile showed that increasing pH led to increasing purity of nano ZnO: 42.9%, 62.2%, 64.7%, and 100% at pH 7, pH 8, pH 10, an d pH 12, resp...

Synthesis and characterization of a narrow size distribution of zinc oxide nanoparticles

International Journal of Nanomedicine, 2011

Zinc oxide nanoparticles (ZnO-NPs) were synthesized via a solvothermal method in triethanolamine (TEA) media. TEA was utilized as a polymer agent to terminate the growth of ZnO-NPs. The ZnO-NPs were characterized by a number of techniques, including X-ray diffraction analysis, transition electron microscopy, and field emission electron microscopy. The ZnO-NPs prepared by the solvothermal process at 150°C for 18 hours exhibited a hexagonal (wurtzite) structure, with a crystalline size of 33 ± 2 nm, and particle size of 48 ± 7 nm. The results confirm that TEA is a suitable polymer agent to prepare homogenous ZnO-NPs. © 2011 Khorsand Zak et al, publisher and licensee Dove Medical Press Ltd.