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Carbon quantum dots (CQDs) in lignin were synthesized by hydrothermal method using lignin as precursor material. These CQDs were employed as fluorescent materials, using water as the solvent and polyvinyl alcohol (PVA) as the supporting medium, to prepare fluorescent ink. Through screen printing, fluorescent labels were printed to explore the anti-counterfeiting potential of lignin CQDs in packaging applications. The potential application of CQDs fluorescent ink in anti-counterfeit packaging was investigated. The results showed that CQDs aqueous solutions exhibited bright green fluorescence under 365 nm UV light, but this fluorescence diminished when the solution dried. Adding PVA to the CQDs solution effectively prevented fluorescence quenching. The CQDs ink containing PVA is printed on substrates such as paper and nonwovens, which is light brown in visible light and green four-leaf clover fluorescence in 365 nm ultraviolet light, demonstrating that lignin CQDs have excellent fluorescence properties and the anti-counterfeiting label produced by the invention has good application potential in the field of fluorescence anti-counterfeiting.

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Preparation of Lignin Carbon Quantum Dots and Their Application in Anti-counterfeiting Printing

  • 会议论文

  • 发表日期：

    2025年

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  • Liancang Zhou,
  • Sijia Zhang,
  • Zeyang Yu,
  • Chenyang Li,
  • Bowen Cheng

摘要

Carbon quantum dots (CQDs) in lignin were synthesized by hydrothermal method using lignin as precursor material. These CQDs were employed as fluorescent materials, using water as the solvent and polyvinyl alcohol (PVA) as the supporting medium, to prepare fluorescent ink. Through screen printing, fluorescent labels were printed to explore the anti-counterfeiting potential of lignin CQDs in packaging applications. The potential application of CQDs fluorescent ink in anti-counterfeit packaging was investigated. The results showed that CQDs aqueous solutions exhibited bright green fluorescence under 365 nm UV light, but this fluorescence diminished when the solution dried. Adding PVA to the CQDs solution effectively prevented fluorescence quenching. The CQDs ink containing PVA is printed on substrates such as paper and nonwovens, which is light brown in visible light and green four-leaf clover fluorescence in 365 nm ultraviolet light, demonstrating that lignin CQDs have excellent fluorescence properties and the anti-counterfeiting label produced by the invention has good application potential in the field of fluorescence anti-counterfeiting.