Nitrogen-doped carbon dots for sensitive detection of ferric ions and monohydrogen phosphate by the naked eye and imaging in living cells.

The K sv exhibits a decreasing trend from 2.95 × 10 4 M −1 to 9.12 × 10 3 M −1 with the increasing temperature from 298 K to 323 K; thus the quenching process induced by Fe 3+ may be due to the static quenching by the formation of the N/S-CDs–Fe 3+ non-fluorescent complex. 1 F 0 / F = 1 + K sv [Q] where K sv and [Q] are the Stern–Volmer quenching constant and the concentration of Fe 3+ , and F 0 and F are the fluorescence intensities of the N-CDs at 556 nm in the absence and presence of Fe 3+ , respectively.

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