Synthesis, characterization and optical properties of zinc oxide nanoparticles

Abstract

Zinc oxide nanoparticles were synthesized using a simple precipitation method with zinc sulfate and sodium hydroxide as starting materials. The synthesized sample was calcined at different temperatures for 2 h. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and proton-induced X-ray emission (PIXE) analysis. SEM images show various morphological changes of ZnO obtained by the above method. The average crystallite sizes of the samples were calculated from the full width at half maximum of XRD peaks by using Debye-Scherrer's formula and were found to be in the nanorange. EDS shows that the above route produced highly pure ZnO nanostructures. PIXE technique was used for trace elemental analysis of ZnO. The optical band gaps of various ZnO powders were calculated from UV-visible diffuse reflectance spectroscopic studies.

Zinc Oxide Nanoparticles Fortified Biscuits as a Nutritional Supplement for Zinc Deficient Rats

“…01-079-5604). The estimated crystal size using Scherer's equation was 25 nm; the obtained results were in accordance with the previously published literatures [17,23]. …”

Comparative study on zinc oxide nanocrystals synthesized by two precipitation methods

“…Platinum peaks were detected in both spectra, which could be due to the platinum coating made at the time of characterization. Kumar et al [18] also reported that EDS study of ZnO samples by method II had pure ZnO phases. From EDS spectra, it was revealed that ZnO nanoparticles synthesized by method II were highly pure, more than that from method I. TEM study: Fig.…”

“…The images show that the synthesized nanoparticles are homogenous, uniformly distributed over the surface. Kumar et al [18] reported different morphologies obtained for the ZnO samples calcined at three different temperatures.…”

Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

“…Intensive studies have been done on various factors, such as precursor concentrations [8,9], temperature [10,11], duration [12], surfactant concentration [7], dopant concentration [6], solvent medium [13], pH of reaction mixture [14] and source of light during synthesis [15], which individually and collectively affect the shape, size and optical properties of ZnO. Various researchers [16][17][18] suggested that NaOH concentration plays a vital role in determining the morphology, size and optical bandgap of obtained nanostructures.…”