Structural and morphological characterizations of ZnO nanopowder synthesized by hydrothermal route using inorganic reactants

Abstract

Zinc oxide nanoscale powder has been synthesized by a hydrothermal route using zinc sulfate and sodium hydroxide. The as-prepared powder was annealed at 600 °C for 2 h and then characterized by X-ray diffraction (XRD), scanning electron microscopy and infra-red Fourier transformed spectroscopy. XRD measurements have shown a ZnO hexagonal wurtzite polycrystalline structure with good crystallinity and the formation of a new sodium pyrosulfate phase in the as-prepared powder. The annealing improves the crystalline quality of the powder and transforms the sodium pyrosulfate phase to a sodium sulfate one. The thermal treatment does not affect the lattice parameters and the Zn–O bond length but improves the random orientation of the ZnO crystallites growth. ZnO crystallites have an interconnected-nano-needles morphology forming irregular shaped aggregates. The size of the crystallites is about 20 nm. EDX analysis has shown the presence of C and S in addition to Zn and O. FTIR spectra confirm the formation of ZnO and sodium sulfate. The synthesized ZnO powder has a very high crystalline quality and the used method is a very advantageous one for the fabrication of nanosized metal oxides from inorganic reactants for photo-catalysis applications.

Insights into the compositional and temperature-mediated magnetic characteristics of chromium-doped ZnO nanoparticles

“…The asymmetric stretching vibration mode of the C=O-related band was spotted in all the synthesized nanoparticles at 1632 cm −1 . This asymmetric stretching vibration band is similar to that of the works studied by Djouadi et al and Patra et al [27,28]. The broadband detected at 3443 cm −1 is attributed to the stretching vibration mode of the hydroxyl group, which exists on the surface of the as-prepared Cr-doped ZnO nanoparticles [29].…”

“…The bands located at 896 and 1414 cm −1 evolved because of the C-H plane deformation vibration mode. Such bands are also testified by Djouadi et al for the hydrothermally derived ZnO nanopowder [27]. The asymmetric stretching vibration mode of the C=O-related band was spotted in all the synthesized nanoparticles at 1632 cm −1 .…”

Synthesis and characterization of ZnO flower-like structures

“…ZnO nanorods and flowers are the promising materials for various types of sensor applications due to their ultrahigh surface-to-volume ratios. Some workers [13][14][15][16][17][18][19][20][21] have carefully studied the gas sensing characteristics of ZnO nanowires. ZnO nanorod photodetectors with Mg dopping have been reported.…”