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An optical method is described for the ratiometric fluorometric determination of cyanide ions. It is based on the use of a mixture of aqueous solutions of blue-emitting carbon dots (CDs) and red-emitting gold nanoclusters (AuNCs). The presence of cyanide reduces the red fluorescence of the AuNCs through the formation of a stable complex [Au(CN)2−]. The blue emission of the CDs, in contrast, stays...
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