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(A, B) SEM images of PLA nanofibers and PPy nanotubes, respectively; and (C, D) TEM images of the PPy nanotubes. The PPy nanotubes were produced by soaking the PLA-PPy core-sheath nanofibers in DCM to selectively remove the PLA cores. The polymerization was conducted with Fe3+ as an oxidant and Cl− as a dopant.
