Layer-by-layer assembly of polymers and anisotropic nanomaterials using spray-based approach
Layer-by-layer assembly of polymers and anisotropic nanomaterials using spray-based approach
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DOI：
10.1557/jmr.2020.44
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发表时间：
2020-03
影响因子：
2.7
通讯作者：
S. De;Anish Patel;J. Lutkenhaus
中科院分区：
文献类型：
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作者：
S. De;Anish Patel;J. Lutkenhaus
传统的浸辅助逐层 (LbL) 组装可产生坚固且保形的涂层，但非常耗时。另外，喷雾辅助逐层（SA-LbL）组装由于吸附时间短而快速加工而引起了人们的兴趣。然而，使用这种基于喷雾的方法组装各向异性纳米材料具有挑战性。这是因为当其中一种吸附组分具有各向异性时，制造“全聚电解质”LbL 薄膜的标准方法不一定能产生令人满意的薄膜生长。在这里，聚合物通过 SA-LbL 组装与模型各向异性纳米材料结合。具体来说，研究了氧化石墨烯 (GO)，并检查了锚定层、胶体稳定性、沿碳框架的电荷分布以及聚合物浓度对生长和薄膜质量的影响，以深入了解如何实现无针孔、光滑的聚合物/GO SA-LbL 涂层。这种方法可能适用于其他各向异性纳米材料，例如粘土或二维纳米材料，以便将来通过喷涂开发均匀涂层。
Traditional dip-assisted layer-by-layer (LbL) assembly produces robust and conformal coatings, but it is time-consuming. Alternatively, spray-assisted layer-by-layer (SA-LbL) assembly has gained interest due to rapid processing resulting from the short adsorption time. However, it is challenging to assemble anisotropic nanomaterials using this spray-based approach. This is because the standard approach for fabricating “ all-polyelectrolyte ” LbL films does not necessarily give rise to satisfactory film growth when one of the adsorbing components is anisotropic. Here, polymers are combined with a model anisotropic nanomaterial via SA-LbL assembly. Specifically, graphene oxide (GO) is investigated, and the effect of anchor layer, colloidal stability, charge distribution along the carbon framework, and concentration of polymer on the growth and the film quality is examined to gain insight into how to achieve pinhole-free, smooth polymer/GO SA-LbL coatings. This approach might be applicable to other anisotropic nanomaterials such as clays or 2D nanomaterials for future development of uniform coatings by spraying.