Development of accurate, convenient and portable methods for monitoring 4-aminophenol (4-AP) is extremely important because of its strong toxicity. Here, a ratiometric fluorescence sensor based on Ag-enhanced luminescence of Tb-DNA complexes has been presented for the detection of 4-AP. The luminescence of Tb-DNA complexes is enhanced about 30 times by Ag, which can trigger energy transfer from DNA to Tb more efficiently. In the presence of 4-AP, Ag can be reduced into Ag owing to its strong reducibility, inducing the decrease of Tb-DNA complexes at 545 nm remarkably. Besides, 4-AP exhibits intrinsic fluorescence at 375 nm under the same conditions. Therefore, ratiometric detection of 4-AP can be achieved using F/F as readout with a detection limit of 0.4 μM. Real water samples have been tsted to evaluate this method in practical application and satisfactory results have been obtained. Furthermore, the addition of 4-AP into Tb-DNA-Ag system induces a visible color variation from green to bluish violet, enabling visual detection of 4-AP under the assistance of a smartphone.
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