A multidisciplinary team led by Sriati Wahyudi—from the Department of Biotechnology, Graduate School, Universitas Padjadjaran—develop an eco-friendly method for synthesizing carbon nanodots (CNDs) using flavonoid extracts derived from Moringa oleifera leaves. By employing a simple hydrothermal process, the researchers produced nearly spherical CNDs averaging just 3.49 nm in diameter. These were co-doped with nitrogen and sulfur (NS–CNDs–Fla), endowing them with broad excitation-emission spectra, excitation-dependent photoluminescence, and exceptional fluorescence properties. The study reveals a scalable, sustainable route to generate highly fluorescent nanomaterials using natural, non-toxic precursors—not harsh chemicals—which opens new possibilities for developing accessible heavy metals sensors. The NS–CNDs–Fla demonstrated strong potential as sensitive fluorescence-based probes for detecting toxic heavy metal ions, leveraging both their intrinsic photoluminescent behavior and the metal-binding capability of flavonoid moieties. This innovation supports key Sustainable Development Goals (SDGs):

SDG 6 (Clean Water and Sanitation) – by enabling early detection of heavy metal pollutants in water systems using green-synthesized materials.

SDG 12 (Responsible Consumption and Production) – through the use of renewable Moringa biomass and mild synthesis methods, minimizing waste and hazardous byproducts.

SDG 3 (Good Health and Well-Being) – by offering safer environmental monitoring tools that help reduce exposure to toxic contaminants.