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A wireless fluorescent flexible force sensor based on aggregation-induced emission doped liquid crystal elastomers.

Xiaoxue Du1,2, Yanjun Liu1, Dongyu Zhao3

  • 1Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, China. luod@sustech.edu.cn.

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This study introduces a novel fluorescent flexible force sensor using aggregation-induced emission (AIE) and liquid crystal elastomer (LCE). This compact, wireless sensor offers anti-electromagnetic interference capabilities for advanced human-friendly electronics.

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Biomedical Engineering

Background:

  • Flexible strain sensors face electromagnetic interference challenges.
  • Existing electronic-free force sensors are bulky and unsuitable for remote, power-free applications.
  • There is a need for compact, wireless, and robust flexible force sensors.

Purpose of the Study:

  • To develop a compact wireless flexible force sensor.
  • To overcome limitations of existing strain and force sensors.
  • To leverage aggregation-induced emission (AIE) and liquid crystal elastomer (LCE) for sensing.

Main Methods:

  • Fabrication of a fluorescent flexible force sensor film by doping liquid crystal elastomer (LCE) with aggregation-induced emission (AIE) molecules.
  • Utilizing the variation in fluorescent intensity, caused by changes in AIE molecule aggregation due to LCE extension/contraction, to measure force.
  • Experimental validation of the sensor's performance and characteristics.

Main Results:

  • Demonstrated a compact, wireless, and flexible force sensor.
  • The sensor exhibits anti-electromagnetic interference properties and passivity.
  • Achieved naked-eye observation of force detection through fluorescence changes.
  • Sensor is lightweight, low-cost, and highly flexible.

Conclusions:

  • The AIE-doped LCE fluorescent sensor offers a promising solution for compact wireless force sensing.
  • This technology has potential applications in human-friendly interactive electronics and remote-control systems.
  • Provides a new platform for non-contact detection methods.