Directed assembly of metal nanoparticles in polymer bilayers
Directed assembly of metal nanoparticles in polymer bilayers
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DOI：
10.1039/c7me00104e
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发表时间：
2018-04-01
影响因子：
3.6
通讯作者：
Tao, Andrea R.
中科院分区：
文献类型：
--
作者：
Hsu, Su-Wen;Long, Yuhan;Tao, Andrea R.
层层和自组装方法的结合有可能实现纳米复合材料的精密组装。了解纳米颗粒如何在堆叠材料之间和内部移动对于指导纳米颗粒组装至关重要。在这里，我们研究了纳米粒子在两种不同的LBL结构中的自组装：(1)由两个不相容的聚合物薄膜组成的双层膜，以及(2)由聚合物和石墨烯组成的具有软硬界面的双层膜。聚合物接枝银纳米立方体(AgNC)被用作一个模型纳米粒子系统，用于系统实验-表征组装速度和所产生的形貌-研究界面的存在如何影响组装。我们观察到，聚合物接枝可以将AgNC固定在双层界面上，降低粒子的迁移率，或者促进粒子在层之间的转移。我们还发现，聚合物粘度和聚合物混合参数可以用来预测组装速度和行为。这些结果为设计更复杂的多层纳米复合材料提供了一条途径。
The integration of layer-by-layer (LbL) and self-assembly methods has the potential to achieve precision assembly of nanocomposite materials. Knowledge of how nanoparticles move across and within stacked materials is critical for directing nanoparticle assembly. Here, we investigate nanoparticle self-assembly within two different LbL architectures: (1) a bilayer composed of two immiscible polymer thin-films, and (2) a bilayer composed of polymer and graphene that possesses a hard-soft interface. Polymer-grafted silver nanocubes (AgNCs) are employed as a model nanoparticle system for systematic experiments - characterizing both assembly rate and resulting morphologies - that examine how assembly is affected by the presence of an interface. We observe that polymer grafts can serve to anchor AgNCs at the bilayer interface and to decrease particle mobility, or can promote particle transfer between layers. We also find that polymer viscosity and polymer mixing parameters can be used as predictors of assembly rate and behavior. These results provide a pathway for designing more complex multilayered nanocomposites.