纳米ZnS/PVDF复合膜的制备及其光学性能

以醋酸锌(ZnAC₂ ·2H₂O)和聚偏氟乙烯(PVDF)为原料, N-N-二甲基甲酰胺为溶剂, 采用溶胶-凝胶原位复合的方法制备纳米硫化锌/聚偏氟乙烯复合膜。X射线衍射和透射电镜分析表明, 复合膜中的ZnS晶粒分布均匀, 平均尺寸在3~7nm之间, 具有明显的立方相结构。紫外-可见吸收光谱和荧光光谱分析表明, 随着ZnS晶粒度的减小, 复合膜的吸收边出现从310→270nm的蓝移, 该复合膜中同时存在368nm的激子复合发光和429nm自激活发光。分散剂的加入不会对复合膜的荧光性能产生本质的影响, 但可以使ZnS生长速度减慢, 分散更均匀。 

Preparation and optical properties of nano-ZnS/PVDF composite films

A sol-gel in-situ method was used to synthesize the nano-ZnS/PVDF composite film by using ZnAC2 ·2H2O and PVDF as the primary materials, and DMF as the solvent. The results analyzed by XRD and TEM exhibit that the ZnS nanoparticles are well distributed in PVDF films and their size can be controlled in the range of 3nm to 7nm. The studies on the UV-VIS absorption spectroscopy show an observable blue-shift with the decrease of the crystal size of ZnS. The fluorescence spectroscopies indicate both the photoemission of recombination with the exciton peaking at 368nm and the emission at 429nm termed 'self-activated’. The optical properties of this composite film are not essentially impacted by adding of dispersant, but the growth of ZnS is limited and the dispersity of these nanoparticles is improved.