A core-shell nanoparticle approach to photoreversible fluorescence modulation of a hydrophobic dye in aqueous media
A core-shell nanoparticle approach to photoreversible fluorescence modulation of a hydrophobic dye in aqueous media
复制标题
水介质中疏水性染料光可逆荧光调制的核壳纳米粒子方法
DOI：
10.1002/chem.200701994
复制
发表时间：
2008-01-01
影响因子：
4.3
通讯作者：
Tong, Zhen
中科院分区：
文献类型：
--
作者：
Chen, Jian;Zeng, Fang;Tong, Zhen
Amphiphilic core-shell nano-particles containing spiropyran moieties have been prepared in aqueous media. The nanoparticles consist of hydrophilic and biocompatible poly(ethyleneimine) (PEI) chain segments, which serve as the shell, and a hydrophobic copolymer of methyl methacrylate (MMA), a spiropyran-linked methacrylate, and a cross-linker, which forms the core of the nanoparticles. A hydrophobic fluorescent dye based on the nitrobenzoxadiazolyl (NBD) group was introduced into the nanoparticles to form NBD-nanoparticle complexes in water. The nanoparticles not only greatly enhance the fluorescence emission of the hydrophobic dye NBD in aqueous media, probably by accommodating the dye molecules in the interface between the hydrophilic shells and the hydrophobic cores, but also modulate the fluorescence of the dye through intraparticle energy transfer. This biocompatible and photoresponsive nanoparticle complex may find applications in biological areas such as biological diagnosis, imaging, and detection. In addition, this nanoparticle approach will open up possibilities for the fluorescence modulation of other hydrophobic fluorophores in aqueous media.
