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Sensors 2018, 18(4), 1171; doi:10.3390/s18041171

Development of a Waterproof Crack-Based Stretchable Strain Sensor Based on PDMS Shielding

1
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, Korea
2
School of Mechanical Engineering, Chungnam National University (CNU), 99 Daehak-Ro, Yuseong-Gu, Daejeon 305-764, Korea
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 22 February 2018 / Revised: 1 April 2018 / Accepted: 9 April 2018 / Published: 12 April 2018
(This article belongs to the Special Issue Smart Sensing System for Real-Time Monitoring)
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Abstract

This paper details the design of a poly(dimethylsiloxane) (PDMS)-shielded waterproof crack-based stretchable strain sensor, in which the electrical characteristics and sensing performance are not influenced by changes in humidity. This results in a higher number of potential applications for the sensor. A previously developed omni-purpose stretchable strain (OPSS) sensor was used as the basis for this work, which utilizes a metal cracking structure and provides a wide sensing range and high sensitivity. Changes in the conductivity of the OPSS sensor, based on humidity conditions, were investigated along with the potential possibility of using the design as a humidity sensor. However, to prevent conductivity variation, which can decrease the reliability and sensing ability of the OPSS sensor, PDMS was utilized as a shielding layer over the OPSS sensor. The PDMS-shielded OPSS sensor showed approximately the same electrical characteristics as previous designs, including in a high humidity environment, while maintaining its strain sensing capabilities. The developed sensor shows promise for use under high humidity conditions and in underwater applications. Therefore, considering its unique features and reliable sensing performance, the developed PDMS-shielded waterproof OPSS sensor has potential utility in a wide range of applications, such as motion monitoring, medical robotics and wearable healthcare devices. View Full-Text
Keywords: crack-based stretchable strain sensor; waterproof sensor; PDMS shielding; underwater strain sensing crack-based stretchable strain sensor; waterproof sensor; PDMS shielding; underwater strain sensing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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    Description: Supplementary Information Supplementary Movie for Underwater Strain Sensing Test

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Hong, S.K.; Yang, S.; Cho, S.J.; Jeon, H.; Lim, G. Development of a Waterproof Crack-Based Stretchable Strain Sensor Based on PDMS Shielding. Sensors 2018, 18, 1171.

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