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A simple and eco‐friendly hydrothermal technique is used to prepare water soluble N‐ and S‐co‐doped carbon quantum dots probes (N,S‐CQDs) from thiosemicarbazide and citric acid. Several characterization techniques were performed to ensure the successful synthesis of highly luminescent N,S‐CQDs. The prepared probe exhibited analytical potential as an optical nanosensor for the spectrofluorimetric determination...
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