Journal
NATURE MATERIALS
Volume 11, Issue 9, Pages 795-801Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3380
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Funding
- National Research Foundation of Korea [20110017530, 20110029862]
- World Class University [R31-2008-000-10083-0]
- Basic Science Research Program [2010-0027955]
- Korea Research Foundation [KRF-J03003]
- Global Frontier R&D Program on Center for Multiscale Energy System
- National Research Foundation of Korea [R31-2012-000-10083-0, 2009-0094042, 2011-0017530] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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