Ultrasensitive ratiometric fluorescent probes for Hg(ii) and trypsin activity based on carbon dots and metalloporphyrin via a target recycling amplification strategy

A ultrasensitive ratiometric fluorescent probe was developed for Hg( ii ) and trypsin based on CDs and TPPS via a target recycling amplification strategy. The detection limits of Hg 2+ and trypsin were 0.086 nM and 0.013 ng mL −1 .