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. 2015 May 8;5:9866. doi: 10.1038/srep09866

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(a) Raman spectra for the bare PP (dark grey) and PLA (light grey) fibers and for the same fibers with graphene, PP + G (magenta) PLA + G (green), showing the characteristic graphene G band at ca. 1580 cm⁻¹. The D band is not visible on the spectra, evidencing the quality of the monolayer graphene used. Photographs of the PLA (b) and PP (c) fibers centered at the edge of the transferred graphene sheet, with graphene on the right. Widths of the fibers are 1.2 mm for the PLA fiber and 1.6 mm for the PP fiber. (d) Transmittance spectra of the PP fiber coated with graphene (PP + G, magenta) and without graphene (PP, dark grey) measured with non-polarized light at normal incidence. Graphene coating results in a 3% decrease in the mean transmittance of the fiber.