Carbonization of Electrospun PAN Nanofibers

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Carbonization of Electrospun PAN Nanofibers ( carbonization-electrospun-pan-nanofibers )

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Polymers 2022, 14, 721 4 of 8 Polymers 2022, 14, x FOR PEER REVIEW 4 of 9 Figure 2. HIM images of CNF mats, stabilized and carbonized at different temperatures, sand‐ Figure 2. HIM images of CNF mats, stabilized and carbonized at different temperatures, sandwiched wiched between titanium (Ti), copper (Cu), stainless steel (StS) sheets and silicon (Si) wafers, respec‐ between titanium (Ti), copper (Cu), stainless steel (StS) sheets and silicon (Si) wafers, respectively. tively. Scale bars define 5 μm in the large images and 2 μm in the insets. Scale bars define 5 μm in the large images and 2 μm in the insets. There is no general trend visible regarding the increase or decrease of the number of broken nanofibers with increasing treatment temperature. For the titanium substrates, the broken ends clearly increase with higher carbonization temperatures; however, the opposite trend is visible for the copper substrates. This is presumably due to the statistical variance between different sample regions in connection with the limited size of the HIM images, thus no generalizing conclusions can be drawn here [24]. Overall, the highest numbers of broken ends are reached with the stainless steel substrate, while the Si wafer seems to be, in this regard, ideally suited for stabilization and incipient carbonization at 500 ◦C.

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