无机/有机掺杂CdTe/PMMA的合成

Preparation and Characterizaion of CdTe/SiO_2/PMMA Composite Particles

采用乳液聚合的方法合成了CdTe/SiO_2/PMMA复合粒子.为了改善微乳体系中CdTe量子点与MMA的相容性,发生聚合物反应前在水/油微乳液体系中采用TEOS的水解合成了二氧化硅修饰的CdTe/SiO_2纳米粒子.扫描电镜显示CdTe/SiO_2/PMMA复合粒子的直径比CdTe/SiO_2纳米粒子的直径略大,为1μm左右.并采用扫描电镜(SEM)、傅氏转换红外线光谱分析仪(FT-IR)、热重分析仪(TGA)和荧光光谱仪对产物进行了表征.结果表明CdTe表面的SiO_2粒子在复合材料中起着物理交联点和化学交联点作用,所合成材料不易产生相分离现象.

A soapless emulsion polymerization method was applied to synthesize CdTe/SiO2/PMMA Composite Particles. CdTe/SiO2 nanoparticles were pretreated with oleic acid after the hydrolysis and condensation of tetraethyl orthosilicate （TEOS） in water-in-oil （W/O） emulsion, in order to improve the compatibility between the CdTe particles and MMA monomer in emulsion system. The results of scanning electron microscopy （SEM） showed the particles size of composites were bigger than the pure CdTe/SiO2 nanopartieles, which are uniform in size, - 1 μm in diameter. The Fourier Transform infrared spectroscopy （ FT-IR ） , Themal gravimetric analysis （TGA） and Fluorescence spectra were employed to characterize the nanocomposites. Experiment results revealed that when the silica nanopartieles acted as crosslinking points in the PMMA matrix, there is no phase separation in the CdTe/SiO2/PMMA Composite Particles.