Particle and Aerosol Research Vol. 6, No. 2, June 2010 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Aerosol-gel synthesis of ZnO quantum dots dispersed in SiO2 matrix and their characteristics
±è»ó±Ô⋅Dudi Adi Firmansyah⋅À̱¤½Â⋅À̵¿±Ù* ºÎ»ê´ëÇб³ ±â°è°øÇкΠ(2010³â 3¿ù 2ÀÏ Åõ°í; 2010³â 5¿ù 6ÀÏ ¼öÁ¤; 2010³â 5¿ù 9ÀÏ °ÔÀçÈ®Á¤)
Abstracts
ZnO quantum dots embedded in a silica matrix without agglomeration were synthesized from TEOS:Zn(NO3)2 solutions in one-step process by aerosol-gel method. It was successfully demonstrated that the size of ZnO Q-dots could be controlled from 2 to 7 §¬verified by a high resolution transmission electron microscope observation. The line scanning energy dispersive X-ray spectroscopy(EDS) revealed that the Q-dots existed preferentially inside SiO2 sphere when Zn/Si < 0.5. However, the Q-dots distributed homogeneously all over the sphere when Zn/Si > 1.0. Blue-shifted UV/Vis
absorption peak observation confirmed the quantum size effect on the optical properties. The photoluminescence(PL) emission peaks of the powders at room temperature were consistent with previous reports in the following aspects: 1)
PL characteristics are dominated by two peaks of deep-level defect-related emissions at 2.4 - 2.8 eV, 2) the first defect-related peak at 2.4 eV was blue shifted due to the quantum size effect with decreasing the concentration of
Zn(NO3)2(decreasing the size of ZnO q dots). More interestingly, the existence of surface-exposed ZnO q dots affects greatly the second defect PL peak at 2.8 eV.
Keywords£ºZnO quantum dots; aerosol-gel method; photoluminescence
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