Electromechanical behavior of single-walled carbon nanotube thin films |
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Authors: | Won Seok Chang Sun-Ah Song Yun Hwangbo Jae-Hyun Kim Hak-Joo Lee |
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Institution: | 1. Department of Nanomechanics , Korea Institute of Machinery and Materials , 171 Jang-dong, Yuseong-gu, Daejeon 305-343 , Korea paul@kimm.re.kr;3. Department of Nanomechanics , Korea Institute of Machinery and Materials , 171 Jang-dong, Yuseong-gu, Daejeon 305-343 , Korea |
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Abstract: | Carbon nanotubes have been intensively studied owing to their great potential in nanoelectronics and nanomechanical devices. Recently, experimental results have shown that single-walled carbon nanotubes (SWCNTs) change their electronic properties when subjected to strain. In this study, the electromechanical characteristics of SWCNT networks were investigated for the application of printable strain sensors on flexible substrates. SWCNT films were formed on plastic substrates of poly(ethylene terephthalate) using a spray process. In this manner, we were able to control the transparency and obtain uniform electrical properties of the films. The films are isotropic on account of the random orientation of bundles of SWCNTs. Experimental results showed a nearly linear change in the resistance across a film when it was subjected to tensile strain, even in the inelastic range of the flexible substrate. The results demonstrate the potential use of SWCNT films for highly sensitive printable strain sensors on a macroscale. |
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Keywords: | SWCNT films strain sensor spray deposition electromechanical properties |
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