Fig. 2From: Tryptophan-sorbitol based carbon quantum dots for theranostics against hepatocellular carcinomaA FT-IR spectrum of B-WS-CQDs, G-WS-CQDs, and R-WS-CQDs. B High resolution X-ray photoelectron spectroscopy (XPS) spectrum of TC-WS-CQDs for O1s (left), N1s (medium), C1s (right)Back to article page