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In this work, we demonstrated that the quinone structure can quench the fluorescence of the carbon dots (CDs). The sensitive determination of dopamine (DA) was studied primarily based on this principle. DA would be transformed into DA quinone under alkaline conditions, which resulted in fluorescence quenching of the CDs. A good linear range from 5 nmol/L to 0.4 mmol/L was obtained and the detection...
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