Serrano-Garcia William, Ramakrishna Seeram, Thomas Sylvia W
Advanced Materials Bio & Integration Research (AMBIR) Laboratory, Department of Electrical Engineering, University of South Florida, Tampa, FL 33620, USA.
Department of Mechanical Engineering, National University of Singapore, Singapore 117574, Singapore.
Polymers (Basel). 2022 Nov 22;14(23):5073. doi: 10.3390/polym14235073.
In this work, the electrospinning technique is used to fabricate a polymer-polymer coaxial structure nanofiber from the p-type regioregular polymer poly(3-hexylthiophene-2,5-diyl) (P3HT) and the n-type conjugated ladder polymer poly(benzimidazobenzophenanthroline) (BBL) of orthogonal solvents. Generally, the fabrication of polymeric coaxial nanostructures tends to be troublesome. Using the electrospinning technique, P3HT was successfully used as the core, and the BBL as the shell, thus conceptually forming a p-n junction that is cylindrical in form with diameters in a range from 280 nm to 2.8 µm. The UV-VIS of P3HT/PS blend solution showed no evidence of separation or precipitation, while the combined solutions of P3HT/PS and BBL were heterogeneous. TEM images show a well-formed coaxial structure that is normally not expected due to rapid reaction and solidification when mixed in vials in response to orthogonal solubility. For this reason, extruding it by using electrostatic forces promoted a quick elongation of the polymers while forming a concise interface. Single nanofiber electrical characterization demonstrated the conductivity of the coaxial surface of ~1.4 × 10 S/m. Furthermore, electrospinning has proven to be a viable method for the fabrication of pure semiconducting coaxial nanofibers that can lead to the desired fabrication of fiber-based electronic devices.
在这项工作中，采用静电纺丝技术，由p型区域规整聚合物聚（3-己基噻吩-2,5-二亚基）（P3HT）和n型共轭梯形聚合物聚（苯并咪唑并苯并菲咯啉）（BBL）在互不相溶的溶剂中制备了一种聚合物-聚合物同轴结构纳米纤维。一般来说，制备聚合物同轴纳米结构往往比较麻烦。利用静电纺丝技术，成功地以P3HT为芯、BBL为壳，从概念上形成了一种直径范围为280 nm至2.8 µm的圆柱形p-n结。P3HT/PS混合溶液的紫外-可见光谱没有显示出分离或沉淀的迹象，而P3HT/PS与BBL的混合溶液是不均匀的。透射电子显微镜图像显示出一种结构良好的同轴结构，由于在小瓶中混合时因互不相溶的溶解性而快速反应和固化，通常不会预期会形成这种结构。因此，利用静电力将其挤出促进了聚合物的快速伸长，同时形成了一个简洁的界面。单根纳米纤维的电学表征表明同轴表面的电导率约为1.4×10 S/m。此外，静电纺丝已被证明是一种可行的方法，用于制备纯半导体同轴纳米纤维，这可以实现基于纤维的电子器件的理想制造。
