The multistage amplifying effect: A novel approach to dramatically increase the sensitivity of chemodosimeter

- This sensor was designed according to a relay strategy with a multistage amplifying effect.
- Immediate color change from colorless to red purple could be observed via naked-eye.
- This sensor displayed high selectivity and sensitivity to Hg2+ ion.
- The detection limit of this probe was as low as 1 × 10−6 M by using as test strips.
- The mechanism of the sensing process was clearly revealed.