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Cosolvent-Mediated Carbon Dots Aggregation in Microgel Microenvironments for Multicolor Dynamic Fluorescence

Hui Shang1,2, Shuangshuang Wu1,2, Yu Sun1,2

  • 1State Key Laboratory of Advanced Marine Materials, Zhejiang Key Laboratory of Extreme-environmental Material Surfaces and Interfaces, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Zhongguan Weat Road, Ningbo, 315201, China.

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|February 5, 2026
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Summary
This summary is machine-generated.

Researchers developed dynamic fluorescent materials using carbon dots (CDs) in microgels. This system offers tunable, programmable multicolor emissions through controlled aggregation and hydrogen-bonding, enabling advanced applications like information storage.

Keywords:
carbon dotscosolventsdynamic fluorescencehydrogen bondmicrogel

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Dynamic fluorescent materials offer tunable emission colors but often face limitations in switching states and modulation complexity.
  • Existing multicolor systems require intricate designs and have a restricted number of color transitions.

Purpose of the Study:

  • To design a novel composite system for tunable, dynamic multicolor fluorescence.
  • To overcome the limitations of few switching states and complex modulation in existing systems.
  • To explore the potential for programmable color evolution in advanced applications.

Main Methods:

  • Embedding aggregation-induced color-tuning carbon dots (CDs) into microgels to form the MG-CDs composite.
  • Utilizing differential swelling of MG-CDs in various solvents (H2O, EtOH, EG) to alter hydrogen-bonding networks and CDs aggregation.
  • Investigating thermo-responsive fluorescence transitions via heating-induced solvent volatilization and hydrogen-bond reorganization in a cosolvent system.

Main Results:

  • MG-CDs exhibited distinct fluorescence emissions based on solvent-induced hydrogen-bonding networks and CDs aggregation states.
  • A cosolvent system coupled with heating enabled complex hydrogen-bonding reorganization, leading to tunable dynamic fluorescence and multiple programmable emission states.
  • The system demonstrated programmable color evolution from monochromatic to polychromatic states when used as ink, suitable for information storage.

Conclusions:

  • Coupling solvent-responsive hydrogen-bond regulation within polymer microenvironments with emitter aggregation is a viable strategy for tunable dynamic fluorescence.
  • The developed MG-CDs system provides a unitary platform for diverse thermo-responsive fluorescence transitions and programmable emission.
  • The application of MG-CDs in inks showcases their potential for advanced information storage and display technologies.