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Carbon Dot-Based Mechanofluorescent Hydrogel with Tunable Fluorescence for Bioengineering Applications.

Elahe Masaeli1, Poushali Das1, Seshasai Srinivasan1,2

  • 1School of Biomedical Engineering, McMaster University, Hamilton, ON, Canada.

Small (Weinheim an Der Bergstrasse, Germany)
|January 14, 2026
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Summary
This summary is machine-generated.

This study introduces novel fluorescent hydrogels that quantitatively detect low mechanical stress using carbon-based quantum dots. These advanced materials offer sensitive, real-time monitoring for applications in soft robotics and tissue engineering.

Keywords:
carbon‐based quantum dotscysteinehydrogelmechanofluorescencesoft material

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Nanotechnology

Background:

  • Fluorescent hydrogels are key for tissue engineering and soft robotics, converting mechanical stress to optical signals.
  • Existing hydrogels struggle with sensitivity to low forces, fluorescence quenching, and lack of bioactivity.

Purpose of the Study:

  • To develop a stimuli-responsive hydrogel with enhanced mechano-responsive fluorescence for sensitive, quantitative detection of low mechanical stress.
  • To overcome limitations of existing systems, including fluorescence quenching and mechanical robustness.

Main Methods:

  • Synthesized hydrogels from gelatin methacryloyl (GelMA), acrylamide (AM), and polyethylene glycol diacrylate (PEGDA).
  • Incorporated carbon-based quantum dots (CQDs) derived from citric acid (GAPC) and cysteine-modified citric acid (GAPCys).
  • Investigated hydrogel response to low compressive forces (250-1250 Pa) and correlated photoluminescence changes with applied stress.

Main Results:

  • Demonstrated a concentration-dependent, linear decrease in photoluminescence with increasing compressive stress.
  • Established a quantitative correlation between fluorescence intensity and applied mechanical stress within the operating range of soft grippers.
  • Achieved robust mechanics, pH sensitivity, biocompatibility, and mitigated fluorescence quenching through CQD integration.

Conclusions:

  • Developed advanced mechanofluorescent hydrogels capable of sensitive and quantitative readout of low mechanical stress.
  • The integrated CQDs and tunable hydrogel matrices overcome fluorescence quenching while maintaining mechanical integrity and bioactivity.
  • These hydrogels provide a versatile platform for soft robotics, tissue engineering scaffolds, and implantable sensors for precise mechanical monitoring.