Hydrophobic Mn ‐Doped Solid‐State Red‐Emitting Carbon Nanodots with AIE Effect and Their Hydrogel Composites for Color‐Changing Anticounterfeiting

Hydrophobic solid-state red-light carbon nanodots (M-CDs) can be synthesized by a one-step hydrothermal method. Mn catalyzes the synthesis of M-CDs, which promotes the formation of the central graphitic carbon structure. The M-CDs/agar hydrogel composites can achieve fluorescence transition behavior because of the special fluorescence transition properties of M-CDs. This strategy enables fabrication of CDs/hydrogel composites for color-changing anticounterfeiting. AbstractThe aggregation-caused quenching has always limited the high concentration and solid-state applications of carbon nanodots. While the aggregation-induced emission effect, dominated by intramolecular motion, may be an effective means to solve this problem. Here, hydrophobic solid-state red-light carbon nanodots (M-CDs) with 95% yield are synthesized by a one-step hydrothermal method using 2,2'-dithiodibenzoic acid as the carbon source and manganese acetate as the dopant source. The disulfide bond of 2,2'-dithiodibenzoic acid serves as the symmetry center of molecular rotation and Mn catalyzes the synthesis of M-CDs, which promotes the formation of the central graphitic carbon structure. The M-CDs/agar hydrogel composites can achieve fluorescence transition behavior because of the special fluorescence transition properties of M-CDs. When this composite hydrogel is placed in water, water molecules contact with M-CDs through the network structure of the hydrogels, making the aggregated hydrogels of M-CDs fluores...
Source: Small - Category: Nanotechnology Authors: Tags: Research Article Source Type: research