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Formation and Band Gap Tuning Mechanism of Multicolor Emissive Carbon Dots from m-Hydroxybenzaldehyde.

Yan LiCan LiuHao SunMenglin ChenDefa HouYunwu ZhengHaijiao XieBei ZhouXu Lin
Published in: Advanced science (Weinheim, Baden-Wurttemberg, Germany) (2023)
Reported in 2004, carbon dots (CDs) have been widely used in various fields due to their excellent optical properties. However, the mechanism of their fluorescence modulation is still a controversial issue, which also seriously affects the further development of carbon dots. In this paper, m-hydroxybenzaldehyde is used as a raw material to obtain multicolor luminescent CDs by pyrolysis under different reaction conditions, thereby revealing the forbidden band tuning and formation mechanism of CDs. Different acid-base conditions lead to different reaction paths of the precursors, forming molecular fluorophores with different conjugated structures, which aggregate to eventually form CDs and further enhance the photoluminescence of the system by inhibiting the movement of the fluorescent centers.
Keyphrases
  • quantum dots
  • energy transfer
  • sensitive detection
  • flow cytometry
  • photodynamic therapy
  • single molecule
  • signaling pathway
  • mass spectrometry
  • light emitting