Figure 2From: The production of concentrated dispersions of few-layer graphene by the direct exfoliation of graphite in organosilanesAbsorption coefficient α determination. Optical absorbance (660 nm) as a function of graphene concentration in PhTES and GPTMS. A Lambert-Beer behavior is shown, with an absorption coefficient α of 4,710 and 2,415 ml·mg−1·m−1, respectively.Back to article page