共聚物
胶束
荧光
材料科学
两亲性
偶氮苯
聚合
量子点
环糊精
聚苯乙烯
光化学
化学工程
聚合物
化学
纳米技术
水溶液
有机化学
物理
工程类
复合材料
量子力学
作者
Siyao Zhu,Feifei Zhao,Mingxiao Deng,Tianyi Zhang,Changli Lü
标识
DOI:10.1016/j.dyepig.2019.04.051
摘要
The nanostructured hybrid assembly has gained growing interest due to their unique electronic, optical and catalytic properties. Herein, a novel ratiometric fluorescent sensor was constructed by coupling blue-green emission carbon dots (CDs) to a block copolymer micelle-encapsulated red-emission CdSe/ZnS QDs through host-guest interaction. The carbon dots (CDs) were prepared by carbonization of β-cyclodextrin (β-CD) via a simple hydrothermal process. The amphiphilic diblock copolymer AZO-PNIPAM-b-P(St-co-MQ) containing azobenzene (AZO)-terminated hydrophilic poly(N-isopropylacrylamide) (PNIPAM) block and hydrophobic polystyrene (PS) block was synthesized by a typical RAFT polymerization. The 5-(2-methacryloylethyloxymethyl)-8- quinolinol (MQ) units were introduced into PS block, which could make CdSe/ZnS QDs to be embedded into the core of the block polymer micelles via coordination interaction in the self-assembling process. The as-fabricated β-cyclodextrin derived CDs-coupled block copolymer hybrid micelles loaded with CdSe/ZnS QDs as a fluorescence sensor exhibited dual emission peaks of CDs centered at 450 nm and CdSe/ZnS QDs at 620 nm with a large peak separation of 170 nm upon excitation at 360 nm. And the as-prepared hybrid micelles as a ratiometric fluorescence sensor can be applied to detect Hg2+ and Cu2+ with the detection limits down to 1.6 and 2.74 μM, respectively.
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