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Flexible Electronics toward Wearable Sensing.

Wei Gao1, Hiroki Ota2, Daisuke Kiriya3

  • 1Division of Engineering and Applied Science , California Institute of Technology , Pasadena , California 91125 , United States.

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|February 16, 2019
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Summary
This summary is machine-generated.

Flexible wearable sensors offer personalized medicine by continuously monitoring health. Innovations in materials and design enable accurate physical and chemical sensing from the skin and sweat.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Nanotechnology

Background:

  • Wearable sensors are vital for personalized medicine, enabling continuous health monitoring and early intervention.
  • Conventional rigid sensors face challenges with motion artifacts and skin mismatch, leading to errors.
  • Flexible electronics offer a solution due to their conformability and natural interaction with the body.

Purpose of the Study:

  • To review recent advancements in flexible electronic devices and systems for physical and chemical monitoring.
  • To highlight material innovations, sensor designs, fabrication techniques, and system integration for wearable sensing.
  • To discuss the potential of flexible electronics in personalized healthcare through continuous, noninvasive monitoring.

Main Methods:

  • Utilizing inorganic nanomaterials for active sensor layers, prepared via physical transfer or solution processes.
  • Developing flexible sensors using printed and transferred materials, including nanowire transistor arrays and conductive pressure-sensitive rubber.
  • Employing liquid metals for conductivity and flexibility, and creating microfluidic systems for sweat analysis.
  • Implementing roll-to-roll printing for mass production of cost-effective flexible chemical sensors.

Main Results:

  • Demonstrated tactile pressure mapping and visualization using e-skin and organic light-emitting diodes.
  • Successfully monitored skin temperature, electrocardiograms, and human activities with wearable sensor patches.
  • Developed a flexible sweat-sensing platform for real-time multiplexed perspiration analysis, including autonomous sweat extraction.
  • Achieved promising results in dehydration monitoring, cystic fibrosis diagnosis, drug monitoring, and noninvasive glucose monitoring.

Conclusions:

  • Flexible electronics, particularly those using nanomaterials and liquid metals, show great promise for physical and chemical wearable sensing.
  • Wearable sweat sensors offer significant potential for noninvasive health diagnostics and monitoring.
  • Future research should focus on robust system design and large-scale human studies to translate these technologies into personalized healthcare.