The EDS result obtained from FESEM (Fig.1D) shows the presence of Ti, O,C, and N in
the CQDs/TiO2 composite nanofibers. In order to study the
distribution of the CQDs into nanofibers, the transmission electron
microscopy (TEM) observation was carried out and compared with
the pristine TiO2 nanofiber (Fig. 2A).