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(a) (b) 0.12 0.10 0.08 0.06 0.04 0.02 268 nm, 0.109 80 60 40 20 0 300 268 nm, 0.057 Bilayer T = 94.3% Monolayer T = 97.1% 200 400 600 Wavelength (nm) 800 400 500 600 700 800 Wavelength (nm) (a) The UV–vis absorption spectra of monolayer graphene and bilayer graphene; peaks are labeled with the wave- length of maximum absorption and the value of maximum absorption. The UV trans- mittance (T, %) is measured at 550nm. (Reproduced with permission from [81].) Figure 1.11 (b) UV–vis spectra of GO and graphene in water solution functionalized both with heparin (unfractioned heparin). (Repro- duced with permission from [82].)(c): UV–vis spectrum of graphene nanosheets in DMF. (Reproduced with permission from [44].) (c) 300 400 500 600 700 800 Wavelength (nm) 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 4.6% and a five-layer-thick flake near 11.5% [80]. The maximum of the absorption is at 268 nm (Figure 1.11a) [81]. UV – Vis spectrum of graphene/unfractioned heparin production after reduction exhibits remarkable lower transmittance compared to the initial graphite oxide/unfractioned heparin solution (Figure 1.11b). The UV–vis spectrum of graphene flakes dispersed in DMF looks very similar with a continuously rising curve from 700 to 300 nm (Figure 1.11c) [44]. Solid GO has a brownish color and dispersions of GO nanosheets also have a brownish tint. The color becomes darker and grayer as GO is reduced to rGO. Because of the different electronic structure, insulated GO has a much 1.3 Characterization of Graphene 15 GO/UFH Graphene/UFH Absorbance Absorption Transmittance (%)PDF Image | An Introduction to Graphene
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