fig24

Figure 24. (A) Schematic illustration of Hg²⁺ detection based on N, S-CDs/Ru materials; (B) TEM image showing the detailed structure and size distribution of N, S-CDs/Ru nanocomposites. Additionally, an SEM image illustrates the morphology of N, S-CDs/Ru nanofibers after the introduction of Hg²⁺; (C) Fluorescence spectra of N, S-CDs/Ru in B-R buffer solution demonstrate changes in fluorescence intensity with varying amounts of Hg²⁺. The inset image provides a visual representation of how the fluorescence of N, S-CDs/Ru varies in the buffer at different concentrations of Hg²⁺; (D) Fluorescence spectra of N, S-CDs/Ru in the presence of different metal ions reveal its selectivity. The inset image offers a visual comparison of the fluorescence response of N, S-CDs/Ru to various metal ions^[144]. Copyright 2024, Elsevier B.V. TEM: Transmission electron microscopy; SEM: scanning electron microscope.