Shin Jae In, Cho Su Jung, Jeon Jisoo, Lee Kwang Hee, Wie Jeong Jae
Department of Polymer Science and Engineering, Inha University, Incheon 22212, South Korea.
Soft Matter. 2019 May 15;15(19):3854-3863. doi: 10.1039/c9sm00478e.
Controlled evaporative self-assembly of semiconducting polymers has mostly been studied on 2-dimensional flat substrates. In this study, we reported capillary-assisted evaporative self-assembly of poly(3-hexylthiophene 2,5-diyl) (P3HT) into 3-D micro-ring patterns through the stick-slip phenomenon within a 3-dimensional cylinder. We deconvoluted the well-known two-step stick-slip phenomenon into three regimes through in situ monitoring of the P3HT self-assembly process using a high-speed camera: pinning and deposition; depinning and slip; and retraction regimes. Furthermore, we investigated the effects of various parameters associated with the self-assembly, including polymer concentration, tilt angle, magnetic field, and evaporation temperature, thus achieving self-assembled microarchitectures with diverse dimensions ranging from dots to lines and networks. The self-assembled microstructures were analyzed qualitatively and quantitatively by evaluating the fast Fourier transform image, surface coverage, fractal dimension and lacunarity of the micropatterns.
半导体聚合物的可控蒸发自组装大多是在二维平面基板上进行研究的。在本研究中，我们报道了通过三维圆柱体内的粘滑现象，将聚（3-己基噻吩-2,5-二亚基）（P3HT）进行毛细管辅助蒸发自组装，形成三维微环图案。我们通过使用高速相机对P3HT自组装过程进行原位监测，将著名的两步粘滑现象解卷积为三个阶段：钉扎与沉积；脱钉与滑动；以及回缩阶段。此外，我们研究了与自组装相关的各种参数的影响，包括聚合物浓度、倾斜角度、磁场和蒸发温度，从而实现了从点到线和网络等不同尺寸的自组装微结构。通过评估微图案的快速傅里叶变换图像、表面覆盖率、分形维数和空隙率，对自组装微结构进行了定性和定量分析。
