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SEM images of SF and SF-MWCNT samples: (a–c) SF fiber surface; (d–f) cross-sectional view of SF fibers; (g–i) SF-MWCNT micro-/nanofiber composite with a surface-coating of MWCNTs throughout the fiber and (j–l) cross-sectional view of the SF-MWCNT micro-/nanofiber composite.
