engleski

Synthesis of ZnO nanoparticles using water molecules generated in esterification reaction

Zinc oxide (ZnO) is an important material with powerful optical, electrical, and structural properties. For same highly technical or biomedical applications, developing a size and morphology controlled ZnO synthesis route is of most importance. This research is a follow up to our previous investigation [1, 2]. The strong impact of triethanolamine (TEA) as a grown particle modifier, on the size and morphology of primary ZnO nanoparticles and the way of their aggregation during solvothermal synthesis of secondary huge microspheres is recently noticed [2]. In the present work zinc oxide particles were synthesized without the addition of water by autoclaving (anhydrous) zinc acetate/alcohol and zinc acetate/acetic acid/alcohol solutions at 160°C for 24 hours. The synthetic procedure is a solvothermal synthesis performed in ethanol or octanol. In dependence on the type of alcohol different shapes and sizes of ZnO particles were obtained. The structural, optical and morphological characteristics of ZnO particles were monitored using X-ray powder diffraction (XRD), UV-Vis spectroscopy, field emission scanning electron microscopy (FE-SEM) and TEM/STEM microscopy. 13C NMR spectroscopy revealed the presence of ethyl acetate ester or octyl acetate ester in the supernatants. The formation of ester in this esterification reaction generated water molecule in situ, which hydrolyzed anhydrous zinc acetate and ZnO is formed.

ZnO ; XRD ; SEM ; TEM/STEM ; 13C NMR

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