Ratiometric fluorescent nanoprobes based on Resonance Rayleigh Scattering and inner filter effect for detecting alizarin red and Pb.

A new ratiometric fluorescent strategy for detection of alizarin red (ARS) was designed based on the fluorescence of CDs and scattered light of scatterer. The CDs-ARS system can be used to detect Pb based on that the complexation between ARS and Pb. With the addition of ARS, the fluorescence of CDs was apparently quenched via inner filter effect (IFE).