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1350 – 1380 cm-1, and 1220 – 1270 cm-1, the strong band at 1732 cm-1 is the C=O stretching and the band at 1684 cm-1 is due to the amide group. After stabilization, the most prominent structural changes were the reduction of the 2241 – 2243 cm-1 peak intensity which is attributed to the CN nitrile group, the reduction of the intensity of the aliphatic CH groups and the reduction of the intensity peak of amide group. The appearance of the peak at 1590 cm-1 is due to a mixture of C=N, C=C, and N-H groups. The CN nitrile is converted into C=N which results from cyclization and cross-linking and prepares the chemical structure for high temperature carbonization. Also the appearance of the C=C group results from dehydrogenation. The FTIR spectra of the carbonized fibers do not contain any structural information because the dark carbon nanofibers have very high absorbance. Figure 3.4. FTIR spectra of as-spun PAN nanofibers, 300°C stabilized nanofibers and nanofibers carbonized at 800°C. Figures 3.5 show SEM and TEM images of carbon nanofibers, which have homogeneous structure, smooth surfaces and uniform diameter along their length. The diameter between different fibers could vary though, as shown in Figure 3.5(b). The 27PDF Image | HIGH STRENGTH CARBON NANOFIBERS DERIVED FROM ELECTROSPUN POLYACRYLONITRILE
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