Quasi-Two-Dimensional Assembly of Bottlebrush Block Copolymers with Nanoparticles in Ultrathin Films: Combined Effect of Graft Asymmetry and Nanoparticle Size
Quasi-Two-Dimensional Assembly of Bottlebrush Block Copolymers with Nanoparticles in Ultrathin Films: Combined Effect of Graft Asymmetry and Nanoparticle Size
复制标题
DOI：
10.1021/acs.macromol.8b01988
复制
发表时间：
2019-01-08
期刊：
影响因子：
5.5
通讯作者：
Shenhar, Roy
中科院分区：
文献类型：
--
作者：
Aviv, Yaron;Altay, Esra;Shenhar, Roy
嵌段共聚物引导纳米粒子的组装可以形成具有周期性排列的纳米复合材料，这对于光子器件和传感器等应用具有重要意义。然而，线性嵌段共聚物对其承载域内纳米颗粒的内部排列提供有限的控制。相比之下，瓶刷嵌段共聚物具有独特的结构属性，可以通过其他方式控制纳米颗粒的局部组织。在这项工作中，我们研究了8和13纳米金纳米粒子与三种不同接枝长度不对称的瓶刷嵌段共聚物的共组装。组装是在超封闭薄膜中进行的，在那里它发生准二维。我们的研究结果表明，接枝不对称可以作为一种额外的工具来增强纳米颗粒的有序性，通过迫使它们定位于结构域的中心，而不管它们的大小。根据接枝不对称对块体平均构象的影响分析了这种行为。
Block copolymer guided assembly of nano particles leads to the formation of nanocomposites with periodic arrangement of nanoparticles, which are important for applications such as photonic devices and sensors. However, linear block copolymers offer limited control over the internal arrangement of nanoparticles inside their hosting domains. In contrast, bottlebrush block copolymers possess unique architectural attributes that enable additional ways to control the local organization of nanoparticles. In this work, we studied the coassembly of 8 and 13 nm gold nanoparticles with three bottlebrush block copolymers differing in the asymmetry of their graft lengths. Assembly was performed in ultraconfined films, where it occurs quasi-two-dimensionally. Our results indicate that graft asymmetry could be used as an additional tool to enhance nanoparticle ordering by forcing them to localize at the center of the domain regardless of their size. This behavior is analyzed in terms of the influence of the graft asymmetry on the average conformations of the blocks.