Achieving 3-D Nanoparticle Assembly in Nanocomposite Thin Films via Kinetic Control
Achieving 3-D Nanoparticle Assembly in Nanocomposite Thin Films via Kinetic Control
复制标题
DOI：
10.1021/acs.macromol.7b00063
复制
发表时间：
2017-03
期刊：
影响因子：
5.5
通讯作者：
Jingyu Huang;Yihan Xiao;Ting Xu
中科院分区：
文献类型：
--
作者：
Jingyu Huang;Yihan Xiao;Ting Xu
含有有序纳米颗粒(NP)组装的纳米复合薄膜是制备超材料的理想候选材料。在纳米复合薄膜中实现纳米粒子的三维组装是热力学上的挑战，因为纳米粒子的尺寸与单个聚合物链的尺寸相似。聚合物基质对NP掺入的熵惩罚导致NP在膜表面或膜中缺陷内聚集。控制装配过程的动力学路径通过阻止系统处于非平衡状态提供了另一条前进的路径。在这里，我们报道了20 nm纳米纳米粒子在超分子中以30 nm为周期进行的薄膜三维分级组装。通过调节纳米粒子在超分子基质中的扩散动力学，纳米粒子的表面聚集被抑制，纳米粒子与超分子共组装形成新的三维形貌。本研究为通过动力学控制获得具有设计性的功能复合薄膜开辟了一条可行的途径。
Nanocomposite thin films containing well-ordered nanoparticle (NP) assemblies are ideal candidates for the fabrication of metamaterials. Achieving 3-D assembly of NPs in nanocomposite thin films is thermodynamically challenging as the particle size gets similar to that of a single polymer chain. The entropic penalties of polymeric matrix upon NP incorporation leads to NP aggregation on the film surface or within the defects in the film. Controlling the kinetic pathways of assembly process provides an alternative path forward by arresting the system in nonequilibrium states. Here, we report the thin film 3-D hierarchical assembly of 20 nm NPs in supramolecules with a 30 nm periodicity. By mediating the NP diffusion kinetics in the supramolecular matrix, surface aggregation of NPs was suppressed and NPs coassemble with supramolecules to form new 3-D morphologies in thin films. The present studies opened a viable route to achieve designer functional composite thin films via kinetic control.