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Sustainable Silk-Derived Multimode Carbon Dots.

Shuo Li1, Huimin Wang1, Haojie Lu1

  • 1Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|September 21, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed sustainable, silk-derived carbon dots (CDs) with unique multimode emission. These novel CDs overcome limitations of traditional carbon dots, enabling diverse applications.

Keywords:
encryption and anti-counterfeitingmultimode emittingsilk-derived carbon dotssustainabilitywhite-light-emitting diodes

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomaterials

Background:

  • Carbon dots (CDs) exhibit valuable luminescent properties but face challenges like aggregation-caused quenching and limited emission modes.
  • Unsustainable preparation methods also restrict the practical applications of conventional carbon dots.

Purpose of the Study:

  • To synthesize sustainable, silk-derived carbon dots with multimode emission.
  • To investigate the structure, luminescent properties, and emission mechanisms of these novel carbon dots.
  • To demonstrate the potential applications of these multimode emitting carbon dots.

Main Methods:

  • Facile synthesis of silk-derived carbon dots using sericin proteins irradiated in a household microwave oven (800 W, 2.5 min).
  • Structural and luminescent characterization of the synthesized carbon dots.
  • Investigation of the mechanisms behind dispersed-state fluorescence (DSF), aggregation-induced fluorescence (AIF), and aggregation-induced room temperature phosphorescence (AIRTP).

Main Results:

  • Successfully synthesized sustainable silk-derived carbon dots exhibiting DSF, AIF, and AIRTP.
  • Characterized CDs with graphitized cores and heteroatom-cluster-rich surfaces.
  • Elucidated emission mechanisms: DSF from graphitized cores, AIF from aggregation-induced surface states, and AIRTP from hydrogen bonds and small singlet-triplet gaps.

Conclusions:

  • The developed silk-derived carbon dots offer a sustainable and versatile alternative to conventional CDs.
  • Their unique multimode emission properties enable applications in white-light-emitting diodes, information encryption, anti-counterfeiting, and visual humidity sensing.