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The authors describe the preparation of gold nanoclusters (AuNCs) capped with kojic acid. The capped AuNCs exhibit bright green fluorescence (peaking at 500 nm upon excitation at 375 nm), a nanosecond lifetime (0.37 ns), and a quantum yield (QY) of 22% in aqueous solution. This is higher than most of the previously reported AuNCs. The QY increases to 58% due to aggregation-induced emission in ethanol...
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