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SEM imaging revealing that the presence of GO led to the melting of the fiber structure when exposed to visible light with an intensity of 8.69 mW/mm2 for 5 min. (A–C) As-spun, heat-treated, and light-treated PCL fibers with 0% GO. (D–F) As-spun, heat-treated, and light-treated PCL fibers with 0.3% GO. (G–I) As-spun, heat-treated, and light-treated PCL fibers with 2% GO. GO (methacrylated graphene oxide) and PCL (poly(ε-caprolactone)). Scale bar: 10 μm.
