Silver Nanoparticles/N-Doped Carbon-Dots Nanocomposites Derived from <i>Siraitia Grosvenorii</i> and Its Logic Gate and Surface-Enhanced Raman Scattering Characteristics

Silver/carbon dots (CDs) nanocomposites receive significant attention for diverse applications owing to their unique physical and chemical properties. Herein, a green method is proposed for synthesizing silver nanoparticle/N-doped CDs (AgNPs/N-CDs) nanocomposites, wherein the AgNPs are grown on the surface of reduced N-CDs derived from Siraitia grosvenorii. The N-CDs were used as a reducing agent and stabilizer, no additional reducing agent and stabilizer were necessary. The as-synthesized AgNPs/N-CDs nanocomposites were characterized using ultraviolet–visible spectroscopy, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). An AND logic system based on the obtained N-CDs was proposed, which avoids complicated modifications and chemical labeling. The surface-enhanced Raman scattering (SERS) properties of the prepared AgNPs/N-CDs nanocomposites were also investigated, indicating the potential application for SERS detection