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This work described a new method for the detection of humic acid (HA) based on the poly(thymine) (polyT)-templated copper nanoparticles (CuNPs). Without the presence of HA, the formation of poly T-templated CuNPs could take place, resulting in strong fluorescence emission peaks at 610nm (upon excitation at 340nm). On the other hand, when HA was present, strong interaction between HA and Cu2+ took...
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