Ultra-bendable and durable Graphene Urethane composite/silver nanowire film for flexible transparent electrodes and electromagnetic-interference shielding
Ultra-bendable and durable Graphene Urethane composite/silver nanowire film for flexible transparent electrodes and electromagnetic-interference shielding
复制标题
DOI：
10.1016/j.compositesb.2019.107406
复制
发表时间：
2019-11-15
影响因子：
13.1
通讯作者：
Kim, Sang Woo
中科院分区：
文献类型：
--
作者：
Choi, Jong Han;Lee, Kwan Young;Kim, Sang Woo
可折叠和可卷曲的智能电子设备暴露于湿度、由于反复弯曲引起的循环疲劳以及电磁波的辐射或干扰环境，从而需要采取对策。本文中，通过在聚对苯二甲酸乙二醇酯（PET）基底上湿烧结银纳米线和疏水性硅烷官能化的石墨烯聚氨酯橡胶（HS/G UR）外涂层来制造具有高品质因数的超可弯曲且耐用的聚合物复合材料/银纳米线膜。烧结的银纳米线（SSN）膜表现出0.8 mm的阈值曲率半径（RoC），这比100 μ m厚的PET基板上的氧化铟锡的阈值曲率半径低约17倍，并且高度适用于可折叠显示器。具有HS-官能化的石墨烯纳米片嵌入的氨基甲酸酯复合物外涂层的HS/G UR/SSN膜显示出0.43 mm的高度降低的阈值RoC，并且由于NW和基底之间增强的粘附力而显著增加了循环弯曲耐久性。在2 mm的RoC下弯曲300，000次后，具有25 μ m厚的PET基底的HS/G UFt/SSN膜的电阻没有显示出变化，并且由于HS官能化的复合外涂层，接触角保持恒定。HS/G UR/SSN膜的电磁干扰屏蔽效能在包括300，000次循环的弯曲试验和在85 ℃和85%相对湿度下持续500小时的高温和高湿耐久性试验之后也显示出几乎没有降低。结果表明，HS/G UR/SSN膜具有优异的柔性和耐久性，使其适用于未来柔性器件的透明电极和/或电磁干扰屏蔽。
Foldable and rollable smart electronic devices are exposed to humidity, cyclic fatigue due to repeated bending, and the radiation or interference environment of electromagnetic waves, thereby necessitating countermeasures. Herein, an ultra-bendable and durable polymer composite/silver nanowire film with a high figure of merit was fabricated via the wet sintering of silver nanowires and a hydrophobic silane-functionalized graphene urethane rubber (HS/G UR) overcoat on a polyethylene terephthalate (PET) substrate. The sintered silver nanowire (SSN) film exhibits a threshold radius of curvature (RoC) of 0.8 mm, which is approximately 17 times lower than that of indium tin oxide on a 100-mu m-thick PET substrate and is highly suitable for foldable displays. The HS/G UR/SSN film with an HS-functionalized graphene nanoflake-embedded urethane composite overcoat showed a highly reduced threshold RoC of 0.43 mm and remarkably increased the cyclic-bending durability due to the enhanced adhesion between the NW and the substrate. After being bent 300,000 times at a RoC of 2 mm, the electrical resistance of the HS/G UFt/SSN film with a 25-mu m-thick PET substrate showed no change and the contact angle remained constant due to the HS-functionalized composite overcoat. The electromagnetic-interference shielding effectiveness of the HS/G UR/SSN film also showed little decrease after the bending test involving 300,000 cycles and a high-temperature and high-humidity durability test at 85 degrees C and 85% relative humidity for 500 h. The results show that the HS/G UR/SSN film has excellent flexibility and durability, making it suitable for use in transparent electrodes and/or electromagnetic-interference shields for future flexible devices.