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Raman spectra of pristine and functionalized MWCNTs. The ratio of integrated intensities of the D and G peaks reflects the amount of defects in the CNT structure, with larger ratio values corresponding to higher defect densities (Refs. 23 and 24).
High resolution TEM images showing (a) quasiperfect microstructure of pristine MWCNTs; [(b) and (c)] defects and structural distortion in functionalized MWCNTs (arrows); CNT pull-out from fracture surfaces of: (d) p-MWCNT/PMMA electrospun fibers; (e) COOH-MWCNT/PMMA; (f) f-MWCNT/PMMA. Scale bars are 10 nm in (a)–(c) and 100 nm in (d)–(f).
Tensile test data and theoretical predictions for all types of electrospun fibers tested in this study.
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