A flexible and highly sensitive strain-gauge sensor using reversible interlocking of nanofibres
- A flexible and highly sensitive strain-gauge sensor using reversible interlocking of nanofibres
- 김홍남; Changhyun Pang; Gil-Yong Lee; Tae-il Kim; Sang Moon Kim; Sung-Hoon Ahn; Kahp-Yang Suh
- Issue Date
- Nature materials
- VOL 11, NO 9-801
- Flexible skin-attachable strain-gauge sensors are an essential component in the development of artificial systems that can mimic the complex characteristics of the human skin. In general, such sensors contain a number of circuits or complex layered matrix arrays. Here, we present a simple architecture for a flexible and highly sensitive strain sensor that enables the detection of pressure, shear and torsion. The device is based on two interlocked arrays of high-aspect-ratio Pt-coated polymeric nanofibres that are supported on thin polydimethylsiloxane layers. When different sensing stimuli are applied, the degree of interconnection and the electrical resistance of the sensor changes in a reversible, directional manner with specific, discernible strain-gauge factors. The sensor response is highly repeatable and reproducible up to 10,000 cycles with excellent on/off switching behaviour. We show that the sensor can be used to monitor signals ranging from human heartbeats to the impact of a bouncing water droplet on a superhydrophobic surface.
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