Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 34, Pages 5427-5434Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201400712
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Funding
- National Science Scholarship
- Singapore-Stanford Biodesign Global Fellowship from the Agency for Science, Technology and Research (A*STAR)
- Singapore Economic Development Board (EDB)
- MSIP (Ministry of Science, ICT and Future Planning), Korea, under the IT Consilience Creative Program [NIPA-2014-H0201-14-1001]
- Air Force Office of Scientific Research [FA9550-12-1-0190]
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Pressure and touch sensitivity is crucial for intuitive human-machine interfaces. Here, we investigate the use of different microstructured elastomers for use as dielectric material in capacitive pressure sensors. We use finite element modeling to simulate how different microstructures can reduce the effective mechanical modulus. We found that pyramidal structures are optimal shapes that reduce the effective mechanical modulus of the elastomer by an order of magnitude. We also investigate the dependence of spacing of the pyramidal microstructures and how it impacts mechanical sensitivity. We further demonstrate the use of these elastomeric microstructures as the dielectric material on a variety of flexible and stretchable substrates to capture touch information in order to enable large area human-computer interfaces for next generation input devices, as well as continuous health-monitoring sensors.
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