Abstract
RESUMO Polyols as solvents are widely and successfully used in various methodologies to obtain zinc oxide nanostructures. One of the main reasons of using polyols is related to its capacity to prevent the agglomeration of ZnO nanoparticles during the synthesis and to promote a more stable colloidal solution of it. In this work it is presented, for the first time, the obtaining of nanostructured ZnO by a polyol mediated solvothermal synthesis using zinc nitrate as precursor. The combination of the zinc source with sodium hydroxide in a polyol medium with PVA as dispersing agent provided a simple process for obtaining nanostructured ZnO. The zinc oxide nanostructures obtained were characterized by UV-visible, XRD, FESEM, TEM, DLS and BET. As result, was obtained a wurtzite phase with hexagonal structure with crystallite size of 12 nm and, according to TEM micrographs, an average size of 14 nm, which was corroborated to other analyses.
Highlights
The nanostructured ZnO is employed in several areas of industry and science due to its interesting properties and characteristics
The results show that the use of Zn(NO3)[2] combined with NaOH ensures a simple process for ZnO synthesis in nanoscale and with uniformity of its structure
The solution remained heated for 4 h, when the thermal degradation of ethylene glycol may have occurred to a small extent[35]
Summary
The nanostructured ZnO is employed in several areas of industry and science due to its interesting properties and characteristics. The solvothermal method with the use of polyols, multivalent alcohols with high boiling points, allows the reactions to occur at high temperatures with no need for high pressures or autoclaves, that’s why it is a versatile and interesting method.
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