Nitrogen-doped carbon dots/Fe3+-based fluorescent probe for the 'off–on' sensing of As(<scp>v</scp>) in seafood

Based on the competition between the electron transfer effect of nitrogen-doped carbon dots (N–CDs)/Fe3+ and the complexation reaction of As(v)/Fe3+, an “off–on” fluorescence assay was developed to detect As(v) in complex food substrates.