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. 2016 Jan 19;11:27. doi: 10.1186/s11671-016-1231-1

Fig. 2.

Fig. 2

a UV–vis spectra of NCDs and N-free CDs. Insets are the photographs of NCDs aqueous solution under day light (left) and UV lamp irradiation (right). b PL spectrum of NCDs with excitation of different wavelengths recorded from 300 to 500 nm