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Carbon dots (CDs) have attracted tremendous attention for their outstanding advantages in luminescence. Here, α-amino-substituted lysine derivatives with the determined chemical structure were employed as precursors to obtain bright and highly stable fluorescent CDs through a facile hydrothermal route. The relationships among the chemical structure of precursors, CD fluorescence, and particle size were investigated. The results indicated that increased numbers of functional groups in precursors could promote the degree of cross-linking and lead to a smaller size, better fluorescent properties, and stronger stability of CDs. The C-CDs that were prepared from lysine derivatives with most functional groups showed excitation-dependent dual excitation and dual emission (DE 2 ), high-stability luminescence, strong resistance to photobleaching, and high selectivity to Fe 3+ and could be used as a sensitive probe for Fe 3+ detection.

Cross-Linked Polyamide Chains Enhanced the Fluorescence of Polymer Carbon Dots