SiO<sub>2</sub>包覆对ZnS纳米材料发光的增强机制

赵健; 楚学影; 李金华; 方铉; 王晓华

doi:10.3788/CO.20140706.0925

Volume 7 Issue 6

Nov. 2014

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Chinese Optics > 2014 > 7(6): 925-930.

ZHAO Jian, CHU Xue-ying, LI Jin-hua, FANG Xuan, WANG Xiao-hua. Mechanism of the enhanced fluorescence of SiO2-coated ZnS nanoparticles[J]. Chinese Optics, 2014, 7(6): 925-930. doi: 10.3788/CO.20140706.0925

Citation:

ZHAO Jian, CHU Xue-ying, LI Jin-hua, FANG Xuan, WANG Xiao-hua. Mechanism of the enhanced fluorescence of SiO₂-coated ZnS nanoparticles[J]. Chinese Optics, 2014, 7(6): 925-930. doi: 10.3788/CO.20140706.0925

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Mechanism of the enhanced fluorescence of SiO₂-coated ZnS nanoparticles

doi: 10.3788/CO.20140706.0925

School of Science, Changchun University of Science and Technology, Changchun 130022, China

Received Date: 11 Sep 2014
Rev Recd Date: 15 Nov 2014
Publish Date: 25 Nov 2014

Abstract

Abstract

In order to investigate the influence of aggregation and surface effect on the optical properties of ZnS nanoparticles, SiO2 is used to modify the surface of ZnS nanoparticles. The optical properties of the synthesized ZnS and ZnS/SiO2 nanoparticles are both studied for making a comparison. According to the absorption spectra recorded by an ultraviolet-visible spectrophotometer, the band gap edge red-shifts from 333 nm to 360 nm. To analyze the emission properties, the fluorescence spectra of the solution and the powders containing the ZnS or ZnS/SiO2 nanoparticles are both collected. It is found that the light emission of the ZnS nanoparticles in the violet to blue region is enhanced obviously when SiO2 is introduced. When the samples are excitated by a xenon lamp, the integrated fluorescence intensity of the ZnS/SiO2 nanoparticles is enhanced by 17.5 times. However, a much smaller enhancement is found in the measurement for the solution samples. The fluorescence is only 1.1 times higher after coating ZnS nanoparticles by SiO2. The inhibition of the aggregation between the ZnS nanoparticles by the SiO2 coated layer is supposed to be responsible for the enhancement, which is confirmed by the photoluminescence data where a 325 nm He-Cd laser is used as the excitation source.
- composites,
- ZnS/SiO2,
- luminescence,
- fluorescence enhancement

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References

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