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Liquid and solid-state tunable fluorescent carbon dots for trace water detection.

Nan Li1,2, Xuezhe Dong1,2, Xugui Lv1,2

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Researchers developed sulfur and nitrogen co-doped carbon dots with tunable fluorescence. These novel carbon dots can detect trace water in organic solvents, demonstrating high sensitivity for acetone detection.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Carbon dots (CDs) are versatile nanomaterials with unique optical properties.
  • Surface states significantly influence the photoluminescence of carbon dots.
  • Developing sensitive and selective methods for trace water detection in organic solvents remains a challenge.

Purpose of the Study:

  • To synthesize sulfur and nitrogen co-doped carbon dots (S,N-CDs).
  • To investigate the tunable fluorescence properties of S,N-CDs in solutions and solid matrices.
  • To explore the application of S,N-CDs for trace water detection in organic solvents.

Main Methods:

  • Synthesis of sulfur and nitrogen co-doped carbon dots.
  • Characterization of photoluminescence properties.
  • Development of a sensing platform for trace water detection.

Main Results:

  • Achieved tunable fluorescence in both solutions and solid matrices, primarily governed by surface states.
  • Demonstrated successful detection of trace water in various organic solvents.
  • Attained a low limit of detection (LOD) of 0.042% for water in acetone.

Conclusions:

  • Sulfur and nitrogen co-doping provides a method to tune the fluorescence of carbon dots.
  • The developed S,N-CDs are effective fluorescent probes for trace water detection.
  • The high sensitivity in acetone highlights the potential for practical applications.