Synthesis of copper nanoclusters from Bacopa monnieri leaves for fluorescence sensing of dichlorvos.

In this work, a facile one-step green synthesis is developed for the fabrication of blue fluorescent copper nanocluster (Brahmi-CuNCs) from the extract of Bacopa monnieri (common name is Brahmi) via microwave method. The as-prepared Brahmi-CuNCs emit blue fluorescence at 452 nm when excited at 352 nm and show a quantum yield of 31.32%. Brahmi-derived blue fluorescent CuNCs acted as a probe for fluorescence sensing of dichlorvos. Upon the addition of dichlorvos, blue emission of Brahmi-CuNCs is gradually turned-off, favoring to establish calibration graph in the range of 0.5-100 μM with a detection limit of 0.23 μM, respectively. The as-synthesized Brahmi-CuNCs exhibited remarkable sensitivity and selectivity toward dichlorvos, offering to assay dichlorvos in various samples (cabbage, apple juice, and rice).