Dual-mode fluorimetric and colorimetric sensors based on iron and nitrogen co-doped carbon dots for the detection of dopamine

Determination of dopamine (DA) is crucial for its intimate relationship with clinical trials and biological environment. Herein, Fe, N co -doped carbon dots (AFC -CDs) were fabricated by optimizing precursors and reaction conditions for fluorimetric/colorimetric dual -mode sensing of DA. With synergistic influence of Fo center dot rster resonance energy transfer and static quenching effect, DA significantly quenched the blue luminescence of AFC -CDs at 442 nm, the production of recognizable tan -brown complex caused evident colorimetric response, achieved the dual -mode fluorimetric/colorimetric sensing for DA. The excellent selectivity and satisfied sensitivity can be confirmed with the limit of detection at 0.29 mu M and 2.31 mu M via fluorimetric/colorimetric mode respectively. The reliability and practicability were proved by recovery of 94.81-101.61% in real samples. Notably, the proposed electron transfer way between AFC -CDs and DA was hypothesized logically, indicated dual -mode probe provided a promising platform for the sensing of trace DA, and could be expanded in environment and food safety.