DU Hong-yan, WEI Zhi-peng, LI Shuang, CHU Xue-ying, FANG Xuan, FANG Fang, LI Jin-hua, CHEN Xin-ying, WANG Xiao-hua. Luminescent Properties of Surface Modified ZnS:Mn Quantum Dot and Detection of Biological Molecules[J]. Chinese Journal of Luminescence, 2013,34(4): 421-426
DU Hong-yan, WEI Zhi-peng, LI Shuang, CHU Xue-ying, FANG Xuan, FANG Fang, LI Jin-hua, CHEN Xin-ying, WANG Xiao-hua. Luminescent Properties of Surface Modified ZnS:Mn Quantum Dot and Detection of Biological Molecules[J]. Chinese Journal of Luminescence, 2013,34(4): 421-426 DOI: 10.3788/fgxb20133404.0421.
Luminescent Properties of Surface Modified ZnS:Mn Quantum Dot and Detection of Biological Molecules
ZnS:Mn quantum dots were prepared by hydrothermal method. The effect of the doping concentration of ZnS:Mn quantum dots on crystal structure and luminescent properties was discussed. The quantum dots were characterized by the fluorescence spectroscopy. The results indicated that ZnS:Mn quantum dots exhibited the strongest emission at 595 nm
with 2% doping mole fraction
then with doping concentration increasing
the intensity of luminescent decreased due to the fluorescence quenching phenomenon. The effect of surface modification on the morphologies and luminescent properties of quantum dots were also discussed. Transmission electron microscope (TEM) images indicated that the surface aggregation phenomenon of ZnS:Mn quantum dots was improved with the MPA surface modification
the quantum dots also exhibited single size and good dispersibility properties
the average particle diameter was about 5 nm. In addition
the surface non-radiation defect centers were reduced
which caused emission peak intensity increasing at 595 nm by Mn
2+
doping. The surface modified ZnS:Mn quantum dots were conjugated with bovine serum albumin (BSA) molecules. In BCA detection
the results indicated that the surface modified ZnS:Mn quantum dots had the better biological conjugation property.
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