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In the present work, a dual mode sensor, which was obtained by integrating B, N, S co-doped carbon dots and Fe3+ (BNS-CDs@Fe3+), was developed for sensing ascorbic acid (AA). The fluorescent signal of BNS-CDs@Fe3+ sensor could be enhanced by AA, and a good linear relationship was obtained in the range of 0.1–600 μM with a detection limit down to 0.05 μM. More fascinatingly, the color of the sensor...
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