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This paper reports the growth mechanism of sol–gel derived nanocrystalline ZnO powder. The influence of pH value on the particle size and its properties are studied using X-ray diffraction, UV, Fourier transform infrared spectroscopy, photoluminescence (PL), and impedance spectroscopy. UV analysis reveals an increase in bandgap due to decrease in particle size. The strong UV emission along with some...
In this paper we presented influence of acidity on nanopowder structure prepared in reaction of precipitation. Zinc oxide was prepared from zinc nitrate and sodium hydroxide with the participation of the microwave field. The investigation revealed that the grain size of zinc oxide and their microstructure significantly depends on the solution pH. The microstructures obtained in the more alkaline reaction...
The deposition of needle-shaped cuprous oxide (Cu2O) particles (20~50 nm) on chitosan nanoparticles were made by anodic oxidation of copper electrode in alkaline solution, Fe2+ was immobilized by chitosan nanoparticles with chelating. Chitosan-Fe2+/Cu2O were used as an immobilized Fenton reagent activated by visible light at biocompatible pH values(pH≈7-8) in the degradation of brilliant red X-3B...
Zinc sulfide nanoparticles were prepared by hydrothermal method and characterized by TEM, FT-IR and BET surface area. The titration results show that the surface of ZnS nanoparticles possessed an obvious acid-base property. With increasing the amount of ZnS nanoparticles in the suspension, the pH buffer capacity of solution increased dramatically. There is a proportional relationship between the amount...
The formation and colloidal stability of zinc oxide nanoparticles, with a mean size smaller than 5 nm, produced under pulsed laser ablation of a zinc metal target in different liquid environments of NaOH and KOH solutions, is reported. Using the 532 nm harmonic of Nd:YAG laser with 65 mJ/p, ZnO nanoparticles were produced only at low concentrations of NaOH. On the other hand at pH>10 and energies...
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