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Doping, Fluorescence Enhancement by Surface Plasma, and Biofunctionalization of ZNS Nanoparticals

Author: ZhouShuYao
Tutor: LiJinHua
School: Changchun University of Science and Technology
Course: Optics
Keywords: ZnS:Mn plasmon optical properties thiol ligands
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Type: Master's thesis
Year: 2014
Downloads: 1
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Abstract


Known as a kind of direct wide band gap semiconductor, Zinc sulfide is widely used in optoelectronic, solar cells and the field of biological detection technology.Due to its low cost, environmental and biological safety, the regulating research of its optical properties has increasingly aroused our attention and has been attached great importance to in recent years, This paper aims at discussing the effect of the doping composed with the precious metal and the function of surface ligands to the optical properties of ZnS. The main points can be listed as follows:(1)We prepared ZnS and ZnS:Mn nanoparticles through sol-gel method, and meanwhile studied the effect of the luminescent properties of Mn2+ion on ZnS nanocrystals.The research results show that,as the Mn2+ion doping concentration increases,the ultraviolet absorption of ZnS:Mn occurred corresponding redshift,the luminous intensity associated with Mn ions also reflects considerable change.(2)The ligands was used as a "bridge" group to make the ZnS:Mn nanoparticles composited with Au nanoparticles directly, the surface plasma of Au influence on ZnS:Mn has been studied.The results show that the luminescence of Mn2+ions can be enhanced after composed with Au nanoparticles, and the ratio between Au and ZnS:Mn nanoparticles has obvious influence on the the enhancement.(3)The effect of luminescence properties of thiol ligands on ZnS nanoparticles was studied. The results show that, the luminescene of Mn2+ions was quenched after modificated by bidentate ligands, and the monodentate ligands modification can achieve better optical properties.

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