Fig. 1: Scalable production of UFPFs.
From: Scalable production of ultrafine polyaniline fibres for tactile organic electrochemical transistors
a Schematic of the good solvent exchange strategy to prepare UFPFs in a modified wet spinning protocol. In the case of poor solvent exchange (light orange region, upper panel), PAni molecules are rapidly solidified into thick gels and protofibres with rough crystallized particles. In the case of good solvent exchange (light blue region, lower panel), the formed gels with low viscosity occur an impressive gel extension and are slenderized into ultrafine fibers. b Schematic of the modified wet spinning process. c Scanning electron microscope (SEM) image of the marked region in (b), showing the sharp necking behavior of gel PAni fibers. The close observation of region 1 (d), region 2 (e), and region 3 (f) in the marked zone of (c), illustrating the sharply necking process of PAni gels. g Photograph of a 5.4-kilometers-long UFPF collected in two hours. Scale bars: c 20 µm, d 2 µm, e 10 µm, g 150 mm.
