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Contamination of food and drinking water by health-risk levels of Al 3+ calls for convenient assays. Here, we report a method to visibly detect Al 3+ at room temperature. Firstly, the chelating ligand of 5-mercaptomethyltetrazole (MMT) was synthesized and modified on the surface of AuNPs through the strong Au–S interaction to form a MMT–AuNP probe, which can remain well-dispersed and...
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