Fig. 4. Schematic representation of amorphous or graphitic CD structures obtained by the thermal decomposition of citric (a-CDs and g-CDs) or aspartic (g-N-CDs) acids. Picture of different fractions of fluorescent carbon under 365 nm UV irradiation and TEM images of short tubule carbon and purified SWNTs. Figure reproduced from ref. 148 with permission from Wiley, copyright 2017.
