Controlled-synthesis of ZnO Nanorings

Abstract

Abstract: ZnO nanorings were prepared on a large scale by a facile solution-based method at 70 ℃ for 5 h via hexamethylenetetramine(C₆H₁₂N₄) and Zn(NO₃)₂·2H₂O as the raw materials in the presence of surfactant PAM-CTAC. The structure and morphology of as-prepared products were characterized by X-ray powder diffraction(XRD) and scanning electron microscopy(SEM). The studies of the influences of experimental conditions such as concentration of surfactant and reactants, reactive temperature and time on the structure and morphology of as-prepared products were carried out. Probable formation mechanism of ZnO nanoring in the presence of surfactant PAM-CTAC was discussed. The results show that as-prepared products are wurtzite hexagonal structure ZnO nanorings with the inner diameter of 220 nm and the wall thickness of nanoring of 70 nm. Reaction temperature and concentration of reactants have influence on the formation and size of ZnO nanorings, but the surfactant PAM-CTAC plays the key role in the formation of ZnO nanorings. Through adjusting the concentration of PAM-CTAC, ZnO nanorings can be synthesized under control. A room temperature FL spectrum of ZnO samples shows that the full width at half maximum(FWHM)(~7 nm) of the UV emission is much narrower than that of commercial ZnO bulk crystals(~18 nm), the narrow FWHM confirms the uniformity and narrow size distribution of the as-synthesized ZnO crystals.

Key words: Zinc oxide, Controlled-synthesis, Nanoring, Surfactant

CLC Number:

O611.4

TrendMD:

PENG Yin*, BAO Ling. Controlled-synthesis of ZnO Nanorings[J]. Chem. J. Chinese Universities, doi: .

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Controlled-synthesis of ZnO Nanorings

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