期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 19, 期 31, 页码 5655-5664出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b905966k
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资金
- National Natural Science Foundation of China [50773038]
- National Basic Research Program of China [2007CB936000]
- Science and Technology Commission of Shanghai Municipality [07pj14048]
- Program for New Century Excellent Talents in University of China
- Foundation for the Author of National Excellent Doctoral Dissertation of China [200527]
A straightforward strategy is presented to functionalize aqueous-phase synthesized CdTe quantum dots (QDs) with thermo-sensitive poly(2-(dimethylamino) ethyl methacrylate) (PDMAEMA) via direct surface-initiated oxyanionic vinyl polymerization. The polymer grafting quantity can be facilely controlled in a wide range up to 95.2wt% by adjusting the weight feed ratio of monomer to pristine QDs. The polymer-grafted QDs still retain good fluorescence properties in solution, solid polymer matrix, and on surfaces of silica (SiO2) sphere. The resulting QD@PDMAEMAs show excellent solubility both in water and organic solvents (e. g., chloroform, dichloromethane, dioxane, ethyl acetate, acetone, methanol, and N, N-dimethylformamide). We have called them amphibious QDs. The thermo-sensitive PDMAEMAs make QDs accessible to self-assemble reversibly by adjusting temperature when the grafted polymer content is over a certain value. The self-assembly process and resulting structure were demonstrated by TEM, variable temperature dynamic light scattering (DLS) and UV-vis spectrometer. Because PDMAEMA is a kind of positive polyelectrolyte, QD@ PDMAEMAs were used as building blocks in the layer-by-layer self-assembly process on the surface of SiO2 spheres, affording fluorescent SiO2 spheres.
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