Highly stabilized and photoluminescence enhancement of ZnS:Mn2+ nanoparticles in biotin matrix

被引:15
|
作者
Keshari, Ashish K. [1 ]
Pandey, Avinash C. [1 ]
机构
[1] Univ Allahabad, Nanophosphor Applicat Ctr, Dept Phys, Allahabad 211002, Uttar Pradesh, India
关键词
biomedical materials; II-VI semiconductors; manganese; nanoparticles; phosphors; photoluminescence; ultraviolet spectra; visible spectra; X-ray chemical analysis; X-ray diffraction; X-ray photoelectron spectra; X-ray scattering; zinc compounds; EXCITED ELECTRONIC STATES; PHOTOPHYSICAL PROPERTIES; POLYMER NANOCOMPOSITES; SEMICONDUCTOR CLUSTERS; CDS CRYSTALLITES; THIN-FILMS; ZNS; SIZE; NANOCRYSTALS; LUMINESCENCE;
D O I
10.1063/1.3086617
中图分类号
O59 [应用物理学];
学科分类号
摘要
We synthesized the ZnS:Mn2+ nanoparticles passivated by biocompatible layer, namely, biotin by chemical precipitation route and studied their temporal evolution for size, structure, optical, and photoluminescence stability. To monitor the structural and optoelectronic properties of the nanoparticles with time, we have characterized the grown product by x-ray diffraction, small angle x-ray scattering, UV visible, and photoluminescence spectroscopic techniques at a regular interval for a period of three months. Results showed that the properties of nanophosphors capped with biotin are remaining the same even after 3 months. Energy dispersive x-ray analysis of 3 month aged sample shows long time compatibility between ZnS:Mn2+ nanoparticles and the biotin. This is also confirmed by electron microscopy that the growth of the nanoparticles is strongly arrested by the biotin. X-ray photoelectron spectra were also recorded to show the chemical state of the elements. Enhanced ratio of Zn 2p to Mn 2p peaks in the x-ray photoelectron spectra of ZnS:Mn2+ nanoparticles shows that the Mn2+ ions are incorporated within ZnS host matrix. We found that biotin capping will enhance the luminescence from ZnS:Mn2+ nanoparticles as compared to without capped particles. Absence of biotin will gradually degrade the luminescence upon aging while drastic degradation in luminescence intensity was observed after annealing. Properties show that biotin also protected the nanoparticles from any environmental attack.
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页数:7
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