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Optical microscopic images of PAN nanofiber mats after 3D printing and being peeled off the printed polymer: (a) PAN on aluminum (electrospun with 80 kV)—average situation; (b) PAN on aluminum (electrospun with 80 kV)—thinnest nanofiber “coating” found on all samples; (c) stabilized PAN (electrospun with 80 kV); and (d) carbonized PAN (electrospun with 50 kV).
