Engineering Surface Patterns with Shape Memory Polymers: Multiple Design Dimensions for Diverse and Hierarchical Structures.
Engineering Surface Patterns with Shape Memory Polymers: Multiple Design Dimensions for Diverse and Hierarchical Structures.
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DOI：
10.1021/acsami.8b15535
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发表时间：
2018-11
影响因子：
9.5
通讯作者：
Lingyu Zhao;Liangpei Zhang;Jun Zhao;Jidong Shi;Zhaohe Dai;Guorui Wang;Cheng Zhang;Bo Li;Xiqiao Feng;Hui Zhang;Jin Zhang;Zhong Zhang
中科院分区：
文献类型：
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作者：
Lingyu Zhao;Liangpei Zhang;Jun Zhao;Jidong Shi;Zhaohe Dai;Guorui Wang;Cheng Zhang;Bo Li;Xiqiao Feng;Hui Zhang;Jin Zhang;Zhong Zhang
表面图案的确定性设计由于其在柔性和可拉伸电子、微流体和光学器件中的广泛应用而引起了人们的兴趣。近年来，双层体系的不稳定性得到了广泛的应用，通过宏观地变形衬底，可以很容易地获得薄膜的微/纳米图案。对于具有传统热稳定衬底的双层系统，图案形态仅由两层的初始应变不匹配决定，并且由于操纵不均匀变形相关的困难，局部图案的实现似乎特别具有挑战性。在这项工作中，我们利用交联聚乙烯（cPE），一种形状记忆聚合物（SMP），作为柔性衬底来构建溅射金薄膜的微/纳米结构。我们发现形状记忆效应可以通过控制薄膜厚度或加热时间以及全局或局部控制热场，为设计多样化和分层的表面结构提供新的维度。通过结合这些策略，我们进一步展示了基于该cPE/金（Au）体系的多用途分层、叠加和局部表面模式。压阻式压力传感器与获得的图像化表面组装在一起，具有高灵敏度、工作范围和循环稳定性。这些结果突出了smp在构建任意表面图案方面的独特优势。
Deterministic design of surface patterns has seen a surge of interests because of their wide applications in flexible and stretchable electronics, microfluidics, and optical devices. Recently, instability of bilayer systems has been extensively utilized by which micro-/nano-patterns of a film can be easily achieved through macroscopically deforming the underlying substrate. For a bilayer system with traditional thermostable substrates, the pattern morphology is only determined by initial strain mismatch of the two layers, and the realization of localized patterns appears to be particularly challenging because of the difficulties associated with manipulating inhomogeneous deformations. In this work, we exploit cross-linked polyethylene ( cPE), a shape memory polymer (SMP), as the flexible substrate for building micro-/nano-structures of sputtered gold films. We find that the shape memory effect can offer new dimensions for designing diverse and hierarchical surface structures by harnessing film thickness orheating time and by globally or locally controlling the thermal field. By combining those strategies, we further demonstrate versatile hierarchical, superimposed, and local surface patterns based on this cPE/gold (Au) system. Piezoresistive pressure sensors are assembled with the obtained patterned surface, which have high sensitivity, operational range, and cyclic stability. These results highlight the unique advantages of SMPs for building arbitrary surface patterns.