Journal
NANOSCALE
Volume 9, Issue 31, Pages 11035-11046Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr01865g
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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-2015 K1A1A2029679]
- Nano Material Technology Development Program through the National Research Foundation of Korea - Ministry of Science, Information and Communication Technologies and Future Planning [NRF-2015 M3A7B4050306]
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The recent development of strain sensor devices which can actively monitor human body motion has attracted tremendous attention, for application in various wearable electronics and human-machine interfaces. In this study, as materials for strain sensor devices, we exploit the low-cost, carbon-based, 3-dimensional (3D) printable composite dough. The dough is prepared via a chemical method based on the formation of electrostatic assemblies between 1-dimensional, amine-functionalized, multi-walled carbon nanotubes and 2-dimensional graphene oxides. The resulting composite dough has an extremely high storage modulus, which allows a vertically-stackable, 3D printing process for fabricating strain sensor devices on various dense, porous and structured substrates. The device performance parameters, including gauge factor, hysteresis, linearity, and overshooting behavior are found to be adjustable by controlling the printing process parameters. The fabricated strain sensor devices demonstrate the ability to distinguish actual human body motions. A high gauge factor of over 70 as well as other excellent device performance parameters are achievable for the printed sensor devices, and even small strains, below 1%, are also detectable by the fabricated sensor devices.
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