Electric Field-Induced Assembly and Alignment of Silver-Coated Cellulose for Polymer Composite Films with Enhanced Dielectric Permittivity and Anisotropic Light Transmission
Electric Field-Induced Assembly and Alignment of Silver-Coated Cellulose for Polymer Composite Films with Enhanced Dielectric Permittivity and Anisotropic Light Transmission
复制标题
用于具有增强介电常数和各向异性透光率的聚合物复合薄膜的镀银纤维素的电场诱导组装和排列
DOI：
10.1021/acsami.0c03086
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发表时间：
2020-05-27
影响因子：
9.5
通讯作者：
Zhang, Jianming
中科院分区：
文献类型：
--
作者：
Chen, Yuwei;Liu, Yuhong;Zhang, Jianming
具有灵活触摸屏的多种可穿戴电子设备已被发明用于广泛的户外活动。与这些可穿戴电子产品相关的一个挑战是开发具有高介电介电常数和各向异性光传输的材料，该材料分别负责高触摸灵敏度和防屏防护保护。本文中，我们通过厚度方向通过电场的厚度方向在聚合物基质中组装和排列各向异性纤维素来解决了一种可扩展的方法，以应对这一挑战。聚合物基质中银色涂层的纤维化纤维素的比对不仅显着提高了介电介电常数，而且可以有效增强光学各向异性。对齐度和填充含量对聚合物复合膜的介电和光学性质的影响已被系统地研究。在应用电场时，原位光学显微镜图像揭示了银色涂层纤维纤维素的动力学和对齐机制。我们认为，这项研究提供了一种轻松的策略，可以通过通过交流电场对嵌入纳米颗粒的对齐方式来增强聚合物复合膜的介电介电常数和光学各向异性，这对于将来的灵活电子和展示技术至关重要。
Multifarious wearable electronics with flexible touch screens have been invented for extensive outdoor activities. One challenge associated with these wearable electronics is the development of materials with both high dielectric permittivity and anisotropic light transmission, which is responsible for high touch sensitivity and screen peep-proof protection, respectively. Herein, we demonstrated a scalable approach for assembling and aligning anisotropic cellulose in a polymer matrix through the thickness direction via the assistance of an electric field to address this challenge. The alignment of silver-coated fibrillated celluloses in the polymer matrix not only significantly increases dielectric permittivity but also effectively enhances optical anisotropy. The impact of alignment degree and filler content on the dielectric and optical properties of polymer composite films has been systematically studied. The kinetics and aligning mechanisms of silver-coated fibrillated celluloses are revealed by in situ optical microscope images while an electric field is applied. We believe that this study provides a facile strategy to enhance both dielectric permittivity and optical anisotropy of polymer composite films by the alignment of embedding nanoparticles via an AC electric field, which is essential for future flexible electronics and display technology.