fig4

Figure 4. (A) Schematic of the fabrication of as-printed fiber; (B) Photo image of 3D-printed fiber cooling in methanol; (C) Photo image showing DMSO/BNNSs dispersion and PVA/DMSO/BNNSs dispersion after standing for one week^[146]. Reprinted with permission. Copyright 2017, American Chemical Society; (D) Schematic of the 3D printing process of coaxial functional fiber^[147]. Reprinted with permission. Copyright 2021, Elsevier; (E) 3D printing procedure of different functional fibers for a sensor^[148]. Reprinted with permission. Copyright 2017, John Wiley and Sons. DMSO: Dimethylsulfoxide; BNNSs: boron nitride nanofibers; PVA: polyvinyl alcohol.