Abstract

Abstract Zinc oxide nanostructures were synthesized via sol–gel methods in the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) amide and in isopropanol, respectively, using zinc acetate dihydrate as a precursor. The synthesized ZnO powders were characterized by means of XRD, SEM-EDX, TGA-DTA and UV-Vis diffuse reflectance spectroscopy. The XRD results of the ZnO powders obtained in either the ionic liquid or in isopropanol exhibit a wurtzite structure with a high degree of crystallinity. The sol–gel growth of ZnO particles in [BMP]TFSA produces a significantly different crystal structure compared with ZnO particles obtained using isopropanol. Hexagonal ZnO nanorods were obtained using isopropanol. However, spherical ZnO nanoparticles were obtained using the ionic liquid. The UV-Vis diffuse reflectance spectra show a slight increase in the band gap of the ZnO powder synthesized using the ionic liquid compared with that of the ZnO prepared using isopropanol. Furthermore, the specific surface area of ZnO prepared using [BMP]TFSA (14.5m2 g-1) is higher than that of ZnO prepared using isopropanol (6.5m2 g-1).

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