Photoluminescence properties of l-cysteine-derived carbon dots prepared in non-aqueous and aqueous solvents

carbon dots formation via intermolecular dehydration reactions between l-cysteine molecules and the formation of sulfonic acid groups were facilitated in a non-aqueous solvent than in an aqueous solvent, leading to enhanced PL properties of CDs-NA

Taishu Yoshinaga; Moeka Akiu; Yoshiki Iso; Tetsuhiko Isobe

2020

Scholarcy highlights

  • carbon dots formation via intermolecular dehydration reactions between l-cysteine molecules and the formation of sulfonic acid groups were facilitated in a non-aqueous solvent than in an aqueous solvent, leading to enhanced PL properties of CDs-NA
  • Fluorescent carbon dots can be produced from amino acids such as l-cysteine by an intermolecular dehydration reaction between NH2 and COOH groups, followed by carbonization. This dehydration reaction may be hindered in aqueous media because the amino acid molecules are surrounded by water; we used a non-aqueous reaction media to facilitate the dehydration reaction
  • The rapid particle growth and formation of the additional functional groups might contribute to the increased PL intensity and absolute PLQY of CDs-NA
  • Through the optimization of the synthesis conditions in a non-aqueous solvent, the absolute PLQY of CDs-NA was increased from 4.2% to 10.2%
  • CD formation via intermolecular dehydration reactions between l-cysteine molecules and the formation of sulfonic acid groups were facilitated in a non-aqueous solvent than in an aqueous solvent, leading to enhanced PL properties of CDs-NA
  • Through the optimization of the synthesis conditions in a non-aqueous solvent, the absolute PLQY of carbon dots-NA was increased from 4.2% to 10.2%

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