Green synthesis of fluorescent carbon quantum dots for the detection of mercury(ii) and glutathione

Author(s): Daraksha Bano ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Vijay Kumar ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Vikas Kumar Singh ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Syed Hadi Hasan ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵

Publication date (Electronic): 2018

Journal: New Journal of Chemistry

Publisher: Royal Society of Chemistry (RSC)

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Abstract

On–off–on detection of Hg ²⁺ and GSH using green-synthesized CQDs from T. indica leaves for the first time.

Abstract

Herein, we report a green synthetic approach for the synthesis of water-soluble fluorescent CQDs via a simple one-step hydrothermal treatment using Tamarindus indica leaves for the first time. The prepared CQDs show an excitation-dependent behavior in the range from 260 to 400 nm with a high QY of approximately 46.6%. Further, the prepared CQDs serve as a very sensitive nanoprobe for the turn-off sensing of Hg ²⁺ with a minimum LOD as low as 6 nM in the dynamic range from 0 to 0.1 μM. The attractiveness of the present sensing system is that it further acts as a turn-on sensor for GSH detection with good selectivity. The feasibility of the present sensing system is also examined using pond water samples for the detection of Hg ²⁺. Thus, the present sensing system is reliable for sensing and several another analytical applications.