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采用纳米沉淀法制备了半导体聚合物CN-PPV纳米粒子,并用改进的Stber方法对纳米粒子进行包覆,获得了发光稳定的SiO2/CN-PPV纳米粒子。用动态光散射(DLS)及透射电镜(TEM)方法对粒子尺寸进行了表征,结果表明包覆前的CN-PPV纳米粒子平均粒径约为30 nm,包覆获得SiO2/CN-PPV纳米粒子的平均粒径约为60 nm。通过紫外-可见吸收光谱及荧光光谱对包覆前后纳米粒子的发光性质进行了比较,发现共轭聚合物CN-PPV包覆后的发射光谱与包覆前相比发生了小的蓝移,表明共轭聚合物的分子构型可能发生了微小变化。SiO2包覆可以提高聚合物发光分子的光稳定性,并且提供用于生物分子耦联的表面,这类材料有望在生物医学成像中获得应用。
CN-PPV nanoparticles were prepared by nano-precipitation method, and the nano-particles were coated by a modified Stöber method to obtain luminescent stable SiO2 / CN-PPV nano-particles. The size of the particles was characterized by dynamic light scattering (DLS) and transmission electron microscopy (TEM). The results showed that the average diameter of CN-PPV nanoparticles before coating was about 30 nm, and the nanoparticles were coated with SiO2 / CN-PPV nanoparticles The average particle size is about 60 nm. The comparison of the luminescence properties of the nanoparticles before and after UV-visible absorption and fluorescence spectroscopy shows that the emission spectrum of the conjugated polymer CN-PPV has a small blue shift compared with that before the coating, indicating that Conjugated polymer molecular configuration may have minor changes. SiO2 coating can improve the photostability of polymer luminescent molecules, and provide the surface for biomolecule coupling, which is expected to be applied in biomedical imaging.