Green Synthesis of Carbon Dots toward Anti-Counterfeiting

By Jiazhuang Guo, He Li, Luting Ling, Ge Li, Rui Cheng, Xuan Lu, Anran Xie, Qing Li, Cai‐Feng Wang, Su Chen. 2020

147 citations recorded by the source corpus.

The synthesis of carbon dots (CDs) from green precursors has received considerable attention recently. However, most of the natural biomass-derived products without further surface treatment usually have quite low quantum yield (QY) varying in the range of 2–30%. Herein, we report the sustainable fabrication of highly fluorescent CDs from food waste, turtle shells, and demonstrate their applications in the fields of multisignal coding and anti-counterfeiting with a combination of colloidal photonic crystals (CPCs). We utilized turtle shells as precursors to synthesize fluorescent CDs via a simple pyrolysis method. The resultant CDs without further surface treatment have an absolute photoluminescence (PL) QY of 45% and high dispersibility in various solvents. Then, we realized collective optical properties with a combination of CDs and CPCs, including diffractive light abilities and fluorescence. CPC/CD bead codes with a structural color and fluorescence were prepared via a microfluidic device. CPC/CD patt...

Subfields: Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/1a238974d2a7c0ad8c50d811f1300027821d9c3a