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摘要

Abstract: Scalability and device integration have been prevailing issues limiting the ability to harness the potential of small-diameter conducting fibers. The authors report inflight fiber printing (iFP), a one-step process that integrates conducting fiber production and fiber-to-circuit connection. Inorganic (silver) or organic {PEDOT:PSS [poly(3,4-ethylenedioxythiophene) polystyrene sulfonate]} fibers with 1- to 3-um diameters are fabricated, with the fiber arrays exhibiting more than 95% transmittance (350 to 750nm). The high surface area-to-volume ratio, permissiveness, and transparency of the fiber arrays were exploited to construct sensing and optoelectronic architectures. The authors show the PEDOT:PSS fibers as a cell-interfaced impedimetric sensor, a 3-D moisture flow sensor, and noncontact, wearable/portable respiratory sensors. The capability to design suspended fibers, networks of homo cross-junctions and hetero cross-junctions, and coupling iFP fibers with 3-D-printed parts paves the way to additive manufacturing of fiber-based 3-D devices with multi-latitude functions and superior spatiotemporal resolution, beyond conventional film-based device architectures. (Science Advances, September 2020, https:// advances.sciencemag.org/content/6/40/eaba0931)