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(a) SEM image of a coiled single nanofiber (average diameter: ~480 nm, length: ~1.32 mm). (b) SEM image of a representative 390-nm diameter straight nanofiber. Inset: close-up view of the nanofiber. (c) HR-SEM image of a 280-nm diameter nanofiber. (d) Intensity-normalized absorption and PL spectra of reference films and nanofibers. Inset: transmission spectrum of PMMA.
