嵌段共聚物/纳米粒子自组装杂化结构的光吸收性能

Optical Absorption Properties and Nanostructures of Self-Assembled Block Copolymer/Nanoparticle Hybrids

结合耗散粒子动力学模拟和时域有限差分方法,研究了两嵌段共聚物(AB)/纳米粒子共混体系的自组装行为及其光吸收性能,分析了纳米粒子与嵌段之间的相互作用参数、纳米粒子大小和共聚物结构对纳米粒子在杂化结构中的分布及其光吸收性能的影响。结果表明,AB/纳米粒子共混体系可形成层状杂化结构,并且调节相互作用参数、纳米粒子大小可以控制纳米粒子分布在A、B相界面或B相,另外共聚物结构也会影响纳米粒子在B相中的分布。当杂化结构中纳米粒子分布不同时,其光吸收率存在显著差异。在可见光范围内,纳米粒子聚集在B相的杂化结构的光吸收率显著高于纳米粒子分布在A、B相界面处的光吸收率,最高可提升75%。改变纳米粒子的分布调控杂化结构的光吸收率,为设计具有优异光吸收性能的杂化材料提供了指导。

The self-assembly behavior and optical absorption property of the blending system involving AB diblock copolymers and nanoparticles were studied by combining dissipative particle dynamics and finite-difference time-domain method.The effects of the interaction parameters between nanoparticles and segments,the size of nanoparticles and the structures of copolymers on the distribution of nanoparticles and optical absorption of hybrid nanostructures were investigated.It was found that AB diblock copolymers/nanoparticles blends can self-assemble into lamellar hybrid nanostructures,varying the interaction parameters and the size of nanoparticles can regulate the distribution of nanoparticles at the interface between A and B phase or at B phase.Besides,the architecture of copolymers can also affect the distribution of nanoparticles in B phase.There is a remarkable difference in the optical absorption performance when the distribution of nanoparticles in hybrid nanostructures has been changed.In the visible range,the optical absorption of the hybrid nanostructures in which the nanoparticles were concentrated in the B phase is higher than that in which the nanoparticles distributed at the interface between A and B phase.The optical absorption of the former hybrid nanostructure is higher than that of the latter one by 75%.The optical absorption can be adjusted by controlling the nanoparticle distribution in hybrid nanostructures.This work would provide guidance for designing advanced hybrid materials with excellent optical absorption performance.