Highly luminescent N-doped carbon dots as a fluorescence detecting platform for Fe3+ in solution and living cells
Iron ion (Fe3+) is one of the most essential elements in the human body; deficiency or overdose of Fe3+ may have adverse effects on human health and immunity. Hence, it is essential to establish a sensitive and selective method for ion detection. In this study, a kind of green fluorescent carbon dots (CDs) was prepared with caffeic acid as carbon source via a simple hydrothermal method. The solution of CDs exhibits 21.5% quantum yield, good salt stability, excellent water solubility, low cytotoxicity and good photobleaching resistance. The as-prepared CDs can be used as a fluorescent probe for the detection of Fe3+ ions in aqueous solution and bioimaging in living cells.