US EPA

1562559 

Journal Article 

Controlled-synthesis of ZnO nanorings 

Peng Yin; Bao Ling 

2008 

1 

Gaodeng Xuexiao Huaxue Xuebao / Chemical Journal of Chinese Universities
ISSN: 0251-0790 

29 

1 

28-32 

WOS:000252618000005 

ZnO nanorings were prepared on a large scale by a facile
solution-based method at 70 degrees C for 5 h via hexamethylenetetramine(C6H12N4) and Zn(NO3)(2)
center dot 2H(2)O 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 run. 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) ( similar to 7 nm) of the UV emission is much narrower
than that of commercial ZnO bulk crystals ( similar to 18 nm) the narrow FWHM confirms the
uniformity and narrow size distribution of the as-synthesized ZnO crystals. 

zinc oxide; controlled-synthesis; nanoring; surfactant