查看文章

In this work, the Fe-based metal-organic framework, NH₂-MIL-88(Fe), was used as the nanocarrier and signal enhancer for the enhancement of CdTe QDs-S₂O₈²⁻ system, an ultrasensitive electrochemiluminescence (ECL) aptasensor was constructed for the detection of malathion. NH₂-MIL-88(Fe) can immobilize abundant CdTe QDs on the interior framework and outer surface. Meanwhile, the mechanism of drastically increasing the ECL intensity of CdTe QDs has been established. Firstly, Fe(II) from NH₂-MIL-88(Fe) as the signal enhancer, could react with S₂O₈²⁻ to generate Fe(III) and SO₄radical dot^-. Then, the Fe(III) can be reduced under the electrochemical reaction. Thus, the cycle-type reaction was come true to produce amounts of SO₄radical dot^-, which could react with CdTe QDs to realize a relative stronger ECL signal. As a result, CdTe QDs@NH₂-MIL-88(Fe) derived novel ECL aptasensor for …