Journal
RSC ADVANCES
Volume 9, Issue 68, Pages 39993-40002Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ra08461d
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Funding
- Global Research Laboratory Program of the National Research Foundation (NRF) - Ministry of Science, Information and Communication Technologies and Future Planning [NRF-2015K1A1A2029679]
- Nano.Material Technology Development Program through the National Research Foundation of Korea - Ministry of Science, Information and Communication Technologies and Future Planning [NRF-2015M3A7B4050306]
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2019M3D1A2103917]
- Kyung Hee University [KHU-20191040]
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In this study, we formulate three-dimensionally (3D) printable composite pastes employing electrostatically assembled-hybrid carbon and a polystyrene-polyisoprene-polystyrene tri-block copolymer elastomer for the fabrication of multi-stack printed piezoresistive pressure sensor arrays. To address a critical drawback of piezoresistive composite materials, we have developed a previously unrecognized strategy of incorporating a non-ionic amphiphilic surfactant, sorbitan trioleate, into composite materials. It is revealed that the surfactant with an appropriate amphiphilic property, represented by the hydrophilic-lipophilic balance (HLB) index of 1.8, allows for a reversible piezoresistive characteristic under a wide pressure range up to 30 kPa as well as a significant reduction of elastomer viscoelastic behavior. The 3D-printed pressure sensor arrays exhibit a sensitivity of 0.31 kPa(-1) in a linear trend, and it is demonstrated successfully that the position-addressable array device is capable of spatially detecting objects up to a pressure level of 22.1 kPa.
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