| 초록 |
In this study, we report a method that can effectively sort GQDs with various dimensions. The method simply utilizes the addition of salts to a heterogeneous mixture of GQD solutions. The purification process is based on differences in dispersibility of individual GQDs as a function of salt concentrations. We found that a salt can distinguish tiny differences in physical properties of GQDs, resulting in the separation of GQDs with narrow windows of physicochemical properties of GQDs. Well-purified GQD subpopulations exhibited GQDs with average diameters of 2.7 ± 1.4 nm, 5.1 ± 1.9 nm, 13.3 ± 3.11 nm, and 18.7 ± 4.44 nm. Consequently, each of GQD subpopulations exhibited blue purple, blue, yellow green and orange emission properties in 325nm excitation condition. These results demonstrate that salts are effective additives in purifying size dependent GQD subpopulations which is entirely new way of spectral tuning. |
