Highly sensitive and ultrastable skin sensors for biopressure and bioforce measurements based on hierarchical microstructures

Qi-Jun Sun, Jiaqing Zhuang, Shishir Venkatesh, Ye Zhou, Suting Han, Wei Wu, Ka-Wai Kong, Wen-Jung Li, Xianfeng Chen, Robert KY Li, Vellaisamy AL Roy

Research output: Contribution to journalArticlepeer-review

Abstract

Piezoresistive microsensors are considered to be essential components of the future wearable electronic devices. However, the expensive cost, complex fabrication technology, poor stability, and low yield have limited their developments for practical applications. Here, we present a cost-effective, relatively simple, and high-yield fabrication approach to construct highly sensitive and ultrastable piezoresistive sensors using a bioinspired hierarchically structured graphite/polydimethylsiloxane composite as the active layer. In this fabrication, a commercially available sandpaper is employed as the mold to develop the hierarchical structure. Our devices exhibit fascinating performance including an ultrahigh sensitivity (64.3 kPa–1), fast response time (<8 ms), low limit of detection of 0.9 Pa, long-term durability (>100 000 cycles), and high ambient stability (>1 year). The applications of these devices in sensing radial artery pulses, acoustic vibrations, and human body motion are demonstrated, exhibiting their enormous potential use in real-time healthcare monitoring and robotic tactile sensing.
Original languageEnglish
Pages (from-to)4086-4094
JournalACS Applied Materials & Interfaces
Volume10
Issue number4
Early online date18 Jan 2018
DOIs
Publication statusPublished - 31 Jan 2018

Keywords

  • bioinspired; e-skin; healthcare monitoring; highly sensitive; phonation rehabilitation

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