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Sensors 2018, 18(9), 2872; https://doi.org/10.3390/s18092872

Effect of Metal Thickness on the Sensitivity of Crack-Based Sensors

1
Department of Mechanical Engineering, Ajou University, San 5, Woncheon-dong, Yeongtong-gu, Suwon 443-749, Korea
2
Global Frontier Center for Multiscale Energy Systems, Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742, Korea
*
Authors to whom correspondence should be addressed.
Received: 30 June 2018 / Revised: 24 August 2018 / Accepted: 28 August 2018 / Published: 31 August 2018
(This article belongs to the Section Physical Sensors)
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Abstract

Among many attempts to make a decent human motion detector in various engineering fields, a mechanical crack-based sensor that deliberately generates and uses nano-scale cracks on a metal deposited thin film is gaining attention for its high sensitivity. While the metal layer of the sensor must be responsible for its high performance, its effects have not received much academic interest. In this paper, we studied the relationship between the thickness of the metal layer and the characteristics of the sensor by depositing a few nanometers of chromium (Cr) and gold (Au) on the PET film. We found that the sensitivity of the crack sensor improves/increases under the following conditions: (1) when Au is thin and Cr is thick; and (2) when the ratio of Au is lower than that of Cr, which also increases the transmittance of the sensor, along with its sensitivity. As we only need a small amount of Au to achieve high sensitivity of the sensor, we have suggested more efficient and economical fabrication methods. With this crack-based sensor, we were able to successfully detect finger motions and to distinguish various signs of American Sign Language (ASL). View Full-Text
Keywords: metal thickness; sensitivity; crack density; crack-based sensory system; motion detecting system; flexible sensing system metal thickness; sensitivity; crack density; crack-based sensory system; motion detecting system; flexible sensing system
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Lee, E.; Kim, T.; Suh, H.; Kim, M.; Pikhitsa, P.V.; Han, S.; Koh, J.-S.; Kang, D. Effect of Metal Thickness on the Sensitivity of Crack-Based Sensors. Sensors 2018, 18, 2872.

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