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Acid-Base Responsive Carbon Nanodots Enabling Reversible Write-Erase Fluorescence Switching for Multilevel

Zin Mar Oo1, Jiurong Li1, Wenxuan Sun1

  • 1State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, P. R. China.

ACS Applied Materials & Interfaces
|May 26, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed green-emitting carbon nanodots (G-CDs) that change color with pH. These stable, responsive G-CDs enable dynamic anticounterfeiting and secure optical encryption through reversible fluorescence switching.

Keywords:
acid–base vapor sensingcarbon nanodotsoptical anticounterfeitingpH-responsive fluorescenceprotonation–deprotonation switching

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Stimuli-responsive luminescent materials are crucial for anticounterfeiting and optical encryption.
  • Developing stable, rapidly responsive luminescent systems across various conditions is a significant challenge.

Purpose of the Study:

  • To synthesize and characterize green-emitting carbon nanodots (G-CDs) with reversible optical switching capabilities.
  • To explore the potential of G-CDs in dynamic anticounterfeiting and secure optical encryption applications.

Main Methods:

  • Solvothermal synthesis of green-emitting carbon nanodots (G-CDs).
  • Photoluminescence spectroscopy to analyze emission properties and pH-dependent switching.
  • Incorporation of G-CDs into polymer-based fluorescent inks for anticounterfeiting pattern fabrication.

Main Results:

  • Synthesized G-CDs exhibit bright green emission (508 nm) with a 27.10% photoluminescence quantum yield (PLQY).
  • G-CDs demonstrate three reversible optical states: nonemissive (acidic), green emission (neutral), and yellow-shifted emission (alkaline).
  • Rapid, noncontact optical modulation achieved in both liquid and vapor phases; stable performance across repeated acid-base cycles.

Conclusions:

  • G-CDs offer a robust platform for reversible write-erase fluorescence switching.
  • The developed G-CDs are suitable for multilevel optical anticounterfeiting and secure information encryption.
  • Surface-state engineering of carbon nanodots is key for tunable acid-base switchable luminescence.