Extinction coefficient as a function of SWCNH concentration, for the whole investigated concentration range. The desired large range of optical densities was obtained applying the described dilution method for increasing the SWCNH original concentrations. For clarity reasons, only the points corresponding to the original concentrations are shown.
Mercatelli et al. Nanoscale Research Letters 2011 6:282 doi:10.1186/1556-276X-6-282