Responsive, 3D Electronics Enabled by Liquid Crystal Elastomer Substrates
Responsive, 3D Electronics Enabled by Liquid Crystal Elastomer Substrates
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DOI：
10.1021/acsami.9b04189
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发表时间：
2019-05-29
影响因子：
9.5
通讯作者：
Ware, Taylor H.
中科院分区：
文献类型：
--
作者：
Kim, Hyun;Gibson, John;Ware, Taylor H.
传统的电子设备是刚性的、平面的和机械静态的。传统电子材料和响应性聚合物基板的组合对于提供用可拉伸、3D和响应性电子器件替代传统电子器件的机会具有重大意义。液晶弹性体（LCE）非常适合用作这种动态基底，因为它们的大应变、可逆刺激响应可以通过分子有序的定向自组装来控制。在这里，我们讨论使用LCE作为电子设备的基板，这些电子设备在加工过程中是平坦的，但随后会变形为受控的3D结构。我们设计和演示各种LCE电子设备的工艺，包括耐变形导电迹线和电容器以及低温响应天线。例如，在衬底内图案化扭曲的螺旋取向可以用于产生螺旋电子器件，其拉伸高达100%，电阻或电容的变化小于2%。此外，我们讨论了自变形LCE天线，它可以动态地改变工作频率从2.7 GHz（室温）到3.3 GHz（-65摄氏度）。我们设想这些3D响应设备在可穿戴或植入式电子产品以及冷链监测射频识别传感器中的应用。
Traditional electronic devices are rigid, planar, and mechanically static. The combination of traditional electronic materials and responsive polymer substrates is of significant interest to provide opportunities to replace conventional electronic devices with stretchable, 3D, and responsive electronics. Liquid crystal elastomers (LCEs) are well suited to function as such dynamic substrates because of their large strain, reversible stimulus response that can be controlled through directed self-assembly of molecular order. Here, we discuss using LCEs as substrates for electronic devices that are flat during processing but then morph into controlled 3D structures. We design and demonstrate processes for a variety of electronic devices on LCEs including deformation-tolerant conducting traces and capacitors and cold temperature-responsive antennas. For example, patterning twisted nematic orientation within the substrate can be used to create helical electronic devices that stretch up to 100% with less than 2% change in resistance or capacitance. Moreover, we discuss self-morphing LCE antennas which can dynamically change the operating frequency from 2.7 GHz (room temperature) to 3.3 GHz (-65 degrees C). We envision applications for these 3D, responsive devices in wearable or implantable electronics and in cold-chain monitoring radio frequency identification sensors.