聚合物含量对锆钛酸铅多层膜光学特性的影响

利用溶胶-凝胶法,由添加高分子聚合物聚乙烯吡咯烷酮(PVP)的化学溶液制备了锆钛酸铅(Pb Zr0.4Ti0.6O3,PZT)多层膜,研究了溶液中聚合物PVP的含量对多层膜光学性能的影响.测试表明,PZT多层膜呈现出由致密层和多孔层交替排布的层状结构,在可见光区具有单一的高反射率带,且反射带中心波长在一定范围内随着溶液中PVP浓度的升高向长波方向移动.在PVP的相对摩尔比为x=1.0时,多层膜反射性能达到最优,室温绝对反射率高达89%,反射带宽为44 nm.

Effect of polymer content on the optical properties of PbZr0.4Ti0.6O3 multilayers

PbZr0.4Ti0.6O3 (PZT) multilayers were prepared by sol-gel method using chemical solutions containing polymer of Polyvinylpyrrolidone (PVP). Effects of PVP content on optical properties of PZT multilayers have been investigated. Tests demonstrated that these multilayers display a layered structure consisting of dense and porous PZT layers and these dense and porous layers are alternately arranged in the layered structure. The reflectance spectra in visible region exhibit a single optical reflection-band with high reflectivity. The central wavelength of the reflection-band shifts to longer wavelength with the increase of PVP concentration within a given polymer content range. The multilayer derived from chemical solution containing PVP with a relative molar ratio of x = 1.0 exhibits the optimal performance with highest optical reflectivity of 89% and largest stop-band width of 44 nm.