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A far-red fluorescence "off-on" sensing strategy is described for sequential ratiometric determination of Cu2+ and L-histidine (L-His) based on fluorescence resonance energy transfer (FRET) system. N,S,P co-doped carbon dots (N,S,P-CDs) and N-acetyl-L-cysteine functionalized gold nanoclusters (NAC-AuNCs) are used in the FRET system, which serve as energy donor and acceptor, respectively. After adding NAC-AuNCs into the solution of N,S,P-CDs, the fluorescence of N,S,P-CDs is effectively quenched, while the far-red fluorescence of NAC-AuNC
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