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Related Experiment Video

Updated: Jan 13, 2026

Dual-mode Imaging of Cutaneous Tissue Oxygenation and Vascular Function
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Dual-Mode Sensor with Saturated Mechanochromic Structural Color Enhanced by Black Conductive Hydrogel for Interactive

Zhiyuan Sun1,2, Binhong Yu1,2, Chao Dong3

  • 1Macao Institute of Materials Science and Engineering (MIMSE), Faculty of Innovation Engineering, Macau University of Science and Technology, Taipa, Macao, 999078, People's Republic of China.

Nano-Micro Letters
|January 10, 2026
PubMed
Summary

This study introduces a novel dual-mode sensor for rehabilitation medicine, combining visual and electrical feedback. The black conductive polymer hydrogel enhances structural color for better interactivity and assessment accuracy.

Keywords:
Conductive hydrogelDual-mode sensorHydroxypropyl celluloseRehabilitation monitoringStructural color

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Wearable Technology

Background:

  • Flexible sensors for rehabilitation often lack visual feedback, limiting user interaction.
  • Existing sensors primarily rely on electrical signals, hindering real-time assessment.
  • Structural coloration in nature offers inspiration for novel sensor designs.

Purpose of the Study:

  • To develop a dual-mode sensor integrating visual and electrical feedback for enhanced rehabilitation.
  • To leverage black conductive polymer hydrogel (CPH) and structural coloration for improved sensor performance.
  • To create a sensor with vivid color perception and robust mechanical properties.

Main Methods:

  • Developed a dual-mode sensor using a hydroxypropyl cellulose (HPC)-based structural color interface on a CPH substrate.
  • Utilized CPH's light-absorbing properties (>88%) to enhance structural color saturation and contrast (4.92).
  • Characterized the CPH sensing component for tensile strength (867.1 kPa), strain sensitivity (gauge factor 4.24), and durability (>4400 cycles).

Main Results:

  • The HPC on CPH substrate exhibited vivid, highly perceptible structural colors and desirable mechanochromic behavior.
  • The CPH substrate significantly enhanced structural color saturation by absorbing scattered light.
  • The integrated sensor provided real-time visual and digital dual feedback, surpassing single-mode sensors.

Conclusions:

  • The developed dual-mode sensor offers enhanced accuracy and interactivity for rehabilitation assessments.
  • This technology, inspired by Cyanocitta stelleri feathers, advances wearable sensors for next-generation rehabilitation medicine.
  • The combination of enhanced structural color and flexible sensing properties holds significant promise for clinical applications.