pH值对高荧光性能CMC/Eu复合纳米材料粒径及其分布的影响

Effect of pH on size and dispersion of CMC/Eu nanocomposites with high fluorescence intensity

令可生物降解的羧甲基纤维素(CMC)和Eu3+在微波加热条件下反应,制备CMC/Eu纳米复合材料。用FT-IR、SEM、AFM、荧光光谱表征其结构、表面形貌和发光性质,并探讨pH值对其粒径大小及分布的影响。结果显示,在实验条件下纳米化后,其荧光强度大幅度提高;粒径在150～500nm范围内;pH值增大,粒径变小,分布均匀;pH值=13.4时粒径最小,分布最均。

CMC/Eu nanocomposites were synthesized under microwave-assisted by reacting with Eu3＋ and CMC,a kind of biodegradable polymer.The structure,surface topography and luminance were characterized by FT-IR,SEM,AFM and fluorescence spectrum.Effect of pH on sizes and distribution of CMC/Eu nanocomposites was also discussed in detail.The results showed that fluorescence intensities of CMC/Eu nanocomposites was much stronger than that of bulk CMC/Eu;particle sizes of CMC/Eu nanocomposites were from 150 to 500nm;moreover,the particle sizes decreasing and particle distribution were more uniformly with pH increasing.The particle size was smallest and well-distributed when pH is 13.4.