| 초록 |
Carbon dots (C-dots) are a particular type of amorphous carbon nanostructures that feature several unique optical properties, especially their strong visible-to-near-infrared fluorescence. It has been reported that the graphitic cores and the surface chemical groups play crucial roles in the formation of the energy states related to fluorescence; however, the exact mechanism still remains unclear and controversial. In general, it has been believed that the synthesis temperature would determine the graphitization degree of the cores, whereas the precursor chemistry would affect the chemical structure of the surface. In this work, we report the synthesis of C-dots in a controlled process with citric acid (precursor) and benzyl alcohol (solvent), allowing the thorough investigation of correlation between the synthesis temperature and the chemical origin of the energy states. The thermal deformation of benzyl alcohol would result in oxidized benzyl alcohol derivatives (OBAs) that significantly induce the carbon-oxygen energy states in the C-dots, and their fluorescence colors could be tuned from blue to red. |
