Hydrophilic ionic liquid-assisted control of size and morphology of ZnO nanoparticles prepared by chemical precipitation method

Title
Hydrophilic ionic liquid-assisted control of size and morphology of ZnO nanoparticles prepared by chemical precipitation method
Author(s)
Dr. A. K. Singh
Issue Date
21-09-2016
Citation
-
Document Abstract
ZnO nanoparticles (NPs) were prepared by chemical precipitation method from zinc acetate dihydrate and NaOH using isopropanol as the reaction medium. The influence of an imidazolium-based hydrophilic ionic liquid (IL), 1-ethyl-3-methylimidazolium methylsulfate, [EMIM][MeSO4] at different concenrations on the size and morpholgy of ZnO NPs was investigated. The NPs were characterized by Fourier transform-infrared, energy dispersive Xray and UV-visible spectroscopy, along with x-ray diffraction, particle size analysis, field emission scanning electron microscopy and high resolution transmission electron microscopy. Pure nanocrystalline ZnO with hexagonal wurtzite phase was formed in the system. The particle size of the NPs varied in the range of 2-55 nm depending on the concentration of the IL used during preparation. With increasing concentration of [EMIM][MeSO4] the shape of the NPs also changed interestingly from spheres to flakes through nanorods. The use of the IL has been proved effective as a self directing agent and templating material for the successful preparation of ZnO nanostructures. Finally, the mechanism for preparation of ZnO NPs with controllable size and morphlogy has been established and the variation of size, shape and morphology has been explained in terms of hydrogen bonding -co- π-π* stacking interaction between IL and the NPs.
Language
English
Document Year
2016
Subject Name
Chemistry
Publisher Name
RSC Advances
Rights :
All rights reserved at Author