Homogeneity Permitted Robust Connection for Additive Manufacturing Stretchable Electronics
Homogeneity Permitted Robust Connection for Additive Manufacturing Stretchable Electronics
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增材制造可拉伸电子产品的同质性允许稳健连接
DOI：
10.1021/acsami.0c13071
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Xue Feng
中科院分区：
文献类型：
--
作者：
Qi-Qi Fu;Tao Zhou;Ying Chen;Jianliang Xiao;Jingxian Xu;Zhao Pan;Xue Feng
界面是柔性电子产品中的阿喀琉斯之踵，其中由不同材料的固有机械性能不匹配导致的滑动、分层或破裂可能使装置失效或引起降解。在各种柔性器件中，特别是当它们需要拉伸性时，高度期望具有强界面强度和低界面阻抗的稳健连接。在这里，提出了一种新的策略，采用同质性，方便地实现鲁棒连接，而不引入第三方夹层。这种策略的关键是在相同的组分材料中实现不同的功能，在这项工作中，通过探索碳纳米管（CNT）在热塑性聚氨酯（TPU）弹性体中的均匀性来证明这种策略。通过调节碳纳米管在TPU弹性体中的均匀性，制备了两种碳纳米管-TPU复合材料。它们呈现出导电性（281倍）、杨氏模量（7.1倍）和应变灵敏度（15.7倍）的对比特性，具有相同重量分数的CNT（15wt%），因此它们可以分别用作全CNT基可拉伸应变监测电子器件中的应变传感器和互连器。表面聚合物链自发缠结引起的互锁效应和干燥过程中界面处逾渗网络的重建赋予了这种连接鲁棒性。该策略的实用价值已经通过经由增材制造制造的鲁棒表皮装置的制造来举例说明。这种表皮装置以分形图案图案进行适形接触，并且可以灵敏地监测身体运动和桡动脉脉搏。
Interface is the Achilles’ heel in flexible electronics, where slipping, delamination, or cracking resulting from the intrinsic mechanical property mismatch of different materials might fail the device or cause degradation. Robust connections with strong interfacial strength and low interfacial impedance are highly desired in all kinds of flexible devices, especially when they require stretchability. Here, a new strategy of employing homogeneity is proposed to facilely achieve robust connection without introducing a third-party interlayer. The key to this strategy is implementing different functions in the same component materials, and in this work, this strategy is demonstrated by exploring the uniformity of carbon nanotube (CNT) in thermoplastic polyurethane (TPU) elastomer. Tuning the uniformity of CNT in TPU elastomer, two kinds of CNT-TPU composites (CTCs) are fabricated. They present contrasting properties of conductivity (281 folds), Young’s modulus (7.1 folds), and strain sensitivity (15.7 folds) with the same weight fraction of CNT (15 wt %), and thus they can respectively act as strain sensor and interconnector in all-CNT-based stretchable strain monitoring electronics. The interlocking effect caused by spontaneous entanglement of surface polymer chains and the reconstruction of percolation network at the interface during drying confer the connection with robustness. The practical value of this strategy has been exemplified by the fabrication of a robust epidermis device via additive manufacturing. This epidermis device is patterned in a fractal motif for conformal contact and can sensitively monitor body motions and radial artery pulse.