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(A) Scanning electron microscopy (SEM) image of coaxial polypyrrole (PPy)-coated polyacrylonitrile (PAN) nanofiber yarn; (B) Field emission scanning electron microscopy (FESEM) image of aligned PPy–PAN nanofibers; (C) Transmission electron microscopy (TEM) image of PPy–PAN nanofiber.
