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This study introduces a new stretchable photonic-crystal hydrogel electrode for detecting neurotransmitters in sweat. This innovation enables accurate, flexible health monitoring for conditions like depression.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Analytical Chemistry

Background:

  • Neurotransmitter dysregulation is linked to depression, necessitating effective monitoring.
  • Current flexible electrochemiluminescence (ECL) platforms face limitations due to rigid electrodes or unstable luminescence.

Purpose of the Study:

  • To develop a stretchable conductive photonic-crystal hydrogel (PCH) electrode for ECL-based sweat neurotransmitter detection.
  • To enhance ECL signal amplification and optical discrimination for improved sensor performance.

Main Methods:

  • Integration of a porous hydrogel with a polymer latex-sphere nanomatrix to create a photonic crystal (PC) structure.
  • Loading of [Ru(bpy)3]2+ luminophore and leveraging mechanochromic properties for tunable band gap matching.
  • Utilizing the PCH platform for qualitative and quantitative analysis of neurotransmitters in buffer and artificial sweat.

Main Results:

  • The PCH platform demonstrated effective loading of luminophores, enhanced ion diffusion, and accelerated electron transfer.
  • Mechanochromic structural color properties allowed for tunable band gap matching, boosting ECL intensity.
  • The sensor achieved 100% accuracy in analyzing 11 neurotransmitters with a 7.5 μM limit of detection in artificial sweat.

Conclusions:

  • The developed PCH-ECL sensor offers a promising solution for flexible, skin-contact neurotransmitter monitoring.
  • This technology supports dynamic, point-of-care diagnostics for mental health conditions.
  • The findings provide a foundation for integrating PCH-ECL sensors into advanced wearable health devices.