聚丙烯腈纳米纤维毡上生长ZnSe纳米晶的结构及发光特性

通过静电纺丝制备聚丙烯腈(PAN)纳米纤维毡,采用水热法在二乙烯三胺和去离子水的混合溶剂中于180℃下制备ZnSe/聚丙烯腈纤维纳米毡复合材料。使用扫描电镜(SEM)、X射线衍射(XRD)、荧光光谱等分析方法对ZnSe/聚丙烯腈复合材料进行表征。结果表明,ZnSe/聚丙烯腈复合材料的形貌较复杂,既有直径10～100 nm,长度50～500 nm的纳米捧,也存在4～10μm左右的ZnSe微米花。260 nm波长光激发下ZnSe/聚丙烯腈复合材料的发射光谱包括位于351 nm(3.55 eV)的弱近紫外激子峰和位于427 nm(2.91 eV)的宽谱带缺陷发光峰,二者相对于ZnSe晶体的本征发射带468 nm均有明显的蓝移效应。

The Structure and Photoluminescence Properties of Electrospun Polyacrylonitrile Nanofibers with ZnSe Nanocrystals

Nowadays preparation of inorganic nanoparticles dispersed in polymer nanofiber film has drawn great attention because this kind of nanocomposites combine the unique properties of inorganic nanoparticles (e.g.,the high ratio of surface atoms to inner sphere atoms and quantum size effect etc.) with the outstanding characteristics of polymer nanofibers (e.g.,the high specific surface area and high interpenetrating capacity in other materials etc.).Nanofibers of polyacrylonitrile were got by electrospinning.ZnSe/polyacrylo-nitrile fiber nanocomposites were prepared by hydrothermal in diethylene triamine/deionized water solvent mixtures at 180℃ for 6 h.Since spinning polyacrylonitrile materials which were acidic containing a certain amount of itaconic acid,Zn²⁺ coordinated with carboxyl,then grew up by bonding Se^2- through covalent effect to yield ZnSe.The samples were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),and the PL of nanocomposites blanket was analyzed by fluorescence.The results showed that when the volume ratio of diethylene triamine and deionized water was 1:3,the products would be got with complex topography.Both nanorods with 10～100 nm in diameter 50～500 nm in length and micron blooms with diameter of 4～10μm were got.The emission spectrum of the nanocomposites at an excitation wavelength of 260 nm gave a small peak at 352 nm and a high-wide peak at 427 nm at room temperature,all of these showed blue shift in respect to bulk ZnSe emission of 468 nm.These room temperature photoluminescence properties indicate that the as-prepared material may have potential applications in light-emission optoelectronic devices.