Flexible All-Solid-State Electrically Tunable Photonic Crystals
Flexible All-Solid-State Electrically Tunable Photonic Crystals
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DOI：
10.1002/adom.201800792
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发表时间：
2018-12-03
影响因子：
9
通讯作者：
Park, Jungyul
中科院分区：
文献类型：
--
作者：
Chang, Hyung-Kwan;Park, Jungyul
电可调谐光子晶体（etpc）具有控制精确、易于控制、响应时间快、实现方便等优点，是一种很有前途的智能材料。然而，先前报道的etpc需要含有溶剂、电解质或液晶的特定液体电池。这些特点导致开关时间长，迟滞大，制造过程长而复杂，使用寿命短，工作不稳定。为了解决这些问题，本文提出了一种利用介电弹性体致动器（dea）在光子晶体中通过化学诱导聚合物膨胀和晶格控制来制备柔性全固态etpc的新方法。全固态etpc具有从红色到蓝绿色的广泛颜色变化和低迟滞长期稳定运行的特点。涂有透明柔性电极的DEA在外加电场下拉伸化学膨胀的胶体晶体-聚二甲基硅氧烷复合材料（红移）；胶体晶体中膨胀的晶格间距离随着电诱导拉伸而减小，导致颜色发生蓝移。由于etpc具有独特的灵活性，可以覆盖三维表面，因此成功地证明了etpc在三维结构上的一致性颜色变化。拟议的柔性全固态etpc有望在未来用作人造伪装皮肤。
Electrically tunable photonic crystals (ETPCs) are promising intelligent materials because of their precise and easy control, fast response time, and convenient implementation. However, the previously reported ETPCs require specific liquid cells that contain solvent, electrolytes, or liquid crystals. These features result in a long switching time, large hysteresis, long and complex fabrication process, and unstable operation with a short lifetime. Here, to address these issues, a new approach of ETPCs, that is, flexible all-solid-state ETPCs, is proposed through chemically induced polymer swelling and lattice control in photonic crystals using dielectric elastomer actuators (DEAs). The all-solid-state ETPCs show a wide range of color changes from red to bluegreen and long-term stable operation with low hysteresis. The DEA coated with transparent compliant electrodes stretches the chemically swollen colloidal crystal-polydimethylsiloxane composite (redshift) under an applied electric field; the swollen interlattice distance in the colloidal crystals decreases with the electrically induced stretching, causing a blueshift in the color. The conformable color change of the ETPCs on a 3D structure is successfully demonstrated owing to their unique flexibility by covering 3D surfaces with the developed ETPCs. The proposed flexible all-solid-state ETPCs are expected to be used as artificial camouflage skins in the future.