Parallel Microcracks-based Ultrasensitive and Highly Stretchable Strain Sensors

Morteza Amjadi, Mehmet Turan, Cameron P. Clementson, Metin Sitti

Research output: Contribution to journalArticle

139 Citations (Scopus)

Abstract

There is an increasing demand for flexible, skin-attachable, and wearable strain sensors due to their various potential applications. However, achieving strain sensors with both high sensitivity and high stretchability is still a grand challenge. Here, we propose highly sensitive and stretchable strain sensors based on the reversible microcrack formation in composite thin films. Controllable parallel microcracks are generated in graphite thin films coated on elastomer films. Sensors made of graphite thin films with short microcracks possess high gauge factors (maximum value of 522.6) and stretchability (ε ≥ 50%), whereas sensors with long microcracks show ultrahigh sensitivity (maximum value of 11 344) with limited stretchability (ε ≤ 50%). We demonstrate the high performance strain sensing of our sensors in both small and large strain sensing applications such as human physiological activity recognition, human body large motion capturing, vibration detection, pressure sensing, and soft robotics.

Original languageEnglish
Pages (from-to)5618-5626
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number8
DOIs
Publication statusPublished - 2 Mar 2016

Keywords

  • human motion detection
  • parallel microcracks
  • skin-attachable sensors
  • strain sensors
  • wearable sensors

ASJC Scopus subject areas

  • Materials Science(all)

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