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Related Experiment Video

Updated: Feb 17, 2026

Author Spotlight: Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing
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Crack-Enhanced Microfluidic Stretchable E-Skin Sensor.

Dong Hae Ho, Ryungeun Song, Qijun Sun1

  • 1Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences , Beijing 100083, P. R. China.

ACS Applied Materials & Interfaces
|December 6, 2017
PubMed
Summary
This summary is machine-generated.

A novel transparent, stretchable microfluidic sensor uses liquid-filled cracks to detect pressure for electronic skin (e-skin) applications. This crack-enhanced capacitive sensor array effectively captures human motion, offering a versatile platform for medical and electronic devices.

Keywords:
crackelectronic skinmicrofluidicpressuresensor

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Biomedical Engineering

Background:

  • Developing advanced electronic skin (e-skin) requires highly sensitive and durable pressure sensors.
  • Microfluidic devices offer unique advantages for sensing due to their controlled fluid dynamics.

Purpose of the Study:

  • To develop a transparent, stretchable, crack-enhanced microfluidic capacitive sensor array for e-skin applications.
  • To investigate the relationship between mechanical stimuli, fluid behavior within microcracks, and sensor capacitance.
  • To demonstrate the sensor's capability in detecting a wide range of pressures and human motions.

Main Methods:

  • Fabrication of a microfluidic sensor array using a lamination process with silver nanowire (AgNW)-embedded rubbery channels.
  • Optimization of sensing performance by testing various injected sensing liquids.
  • Utilizing finite element method (FEM) simulations to analyze fluid-interface dynamics and sensitivity.
  • Characterization of the sensor's response to external mechanical stimuli across a pressure range of 0.1-140 kPa.

Main Results:

  • The sensor demonstrated increased capacitance due to enhanced interfacial contact area between the liquid and AgNW electrodes upon mechanical deformation.
  • Device sensitivity was found to be strongly correlated with the initial fluid interface and changes in liquid-crack wall contact length.
  • The sensor successfully detected a broad spectrum of pressures (0.1-140 kPa) and ordinary human motions.
  • 2D color mappings of simultaneous external load sensing were successfully acquired.

Conclusions:

  • The developed crack-enhanced microfluidic capacitive sensor presents a promising sensing platform for e-skin.
  • The fabrication method is simple and compatible with large-scale production.
  • The sensor's transparency, stretchability, and sensitivity make it suitable for diverse emerging medical and electronic applications.