Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-hiroshima, Hiroshima, 739-8526, Japan.
Natural Science Center for Basic Research and Development (N-BARD), Hiroshima University, 1-3-1 Kagamiyama, Higashi-hiroshima, Hiroshima, 739-8526, Japan.
Sci Rep. 2017 Jul 11;7(1):5141. doi: 10.1038/s41598-017-05396-9.
The realization of room-temperature processes is an important factor in the development of flexible electronic devices composed of organic materials. In addition, a simple and cost-effective process is essential to produce stable working devices and to enhance the performance of a smart material for flexible, wearable, or stretchable-skin devices. Here, we present a soft friction transfer method for producing aligned polymer films; a glass substrate was mechanically brushed with a velvet fabric and poly(3-hexylthiophene) (P3HT) solution was then spin-coated on the substrate. A P3HT film with a uniaxial orientation was obtained in air at room temperature. The orientation factor was 17 times higher than that of a film prepared using a conventional friction transfer technique at a high temperature of 120 °C. In addition, an oriented film with a thickness of 40 nm was easily picked up and transferred to another substrate. The mechanism for orientation of the film was investigated using six experimental methods and theoretical calculation, and was thereby attributed to a chemical process, i.e., cellulose molecules attach to the substrate and act as a template for molecular alignment.
室温过程的实现是开发由有机材料组成的柔性电子设备的一个重要因素。此外，为了生产稳定工作的器件并提高用于柔性、可穿戴或拉伸皮肤器件的智能材料的性能，一个简单且具有成本效益的工艺是必不可少的。在这里，我们提出了一种用于制备取向聚合物膜的软摩擦传递方法；用绒布机械刷玻璃基底，然后在基底上旋涂聚(3-己基噻吩)（P3HT）溶液。在室温空气中获得具有单轴取向的 P3HT 膜。取向因子比在 120°C 的高温下使用传统摩擦传递技术制备的膜高 17 倍。此外，很容易将厚度为 40nm 的取向膜拾取并转移到另一个基底上。通过六种实验方法和理论计算研究了膜的取向机制，并将其归因于化学过程，即纤维素分子附着在基底上并充当分子取向的模板。
