Determinative Surface-Wrinkling Microstructures on Polypyrrole Films by Laser Writing
Determinative Surface-Wrinkling Microstructures on Polypyrrole Films by Laser Writing
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通过激光写入确定聚吡咯薄膜的表面起皱微结构
DOI：
10.1021/acs.langmuir.8b00697
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Lu Conghua
中科院分区：
文献类型：
--
作者：
Cong Jianwen;Wang Juanjuan;Xie Jixun;Yang Chengfeng;Zhao Jingxin;Li Lele;Cao Yanping;Fery Andreas;Feng Xi Qiao;Lu Conghua
我们报告了一种简单有效的激光写入策略，可以在导电聚吡咯（PPy）薄膜上制造分层嵌套褶皱微结构，这使我们能够开发具有多种应用的先进功能表面。本策略采用聚吡啶薄膜的光热效应来模拟在自然界中观察到的分层嵌套褶皱的形成，并设计可控的微尺度褶皱图案。在这里，通过吡咯在酸性溶液中的氧化聚合，在聚二甲基硅氧烷（PDMS）衬底上生长PPy薄膜，并伴有波长为λ1和λ2的两种不同尺度的原位自皱。随后激光曝光的PPy/PDMS双层诱导了一个新的表面皱纹与更大的波长（即λ3）。由于初始λ1皱纹的保留，我们得到了分层嵌套皱纹，较小的λ1皱纹嵌套在较大的λ3皱纹中。重要的是，我们通过控制双分子层和激光之间的相对运动，实现了复杂取向褶皱微结构的大规模路径确定制造。结合PPy薄膜中表面颜色、表面起皱微结构和电导率的诱导变化，激光写入策略可以找到广泛的应用，例如，在表面润湿特性的调制和微电路的制造中，正如本工作所展示的那样。
We report a simple and efficient laser-writing strategy to fabricate hierarchical nested wrinkling microstructures on conductive polypyrrole (PPy) films, which enables us to develop advanced functional surfaces with diverse applications. The present strategy adopts the photothermal effect of PPy films to mimick the formation of hierarchical nested wrinkles observed in nature and design controlled microscale wrinkling patterns. Here, the PPy film is grown on a poly(dimethylsiloxane) (PDMS) substrate via oxidation polymerization of pyrrole in an acidic solution, accompanied by in situ self-wrinkling with wavelengths of two different scales (i.e., λ1and λ2). Subsequent laser exposure of the PPy/PDMS bilayer induces a new surface wrinkling with a larger wavelength (i.e., λ3). Owing to the retention of the initial λ1wrinkles, we obtain hierarchical nested wrinkles with the smaller λ1wrinkles nested in the larger λ3ones. Importantly, we realize the large-scale path-determinative fabrication of complex oriented wrinkling microstructures by controlling the relative motion between the bilayer and the laser. Combined with the induced changes in surface color, surface-wrinkling microstructures, and conductivity in the PPy films, the laser-writing strategy can find broad applications, for example, in modulation of surface wetting properties and fabrication of microcircuits, as demonstrated in this work.