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Electrode connection to reduce the variation of electrical resistance owing to deformation of a flexible sensor

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Abstract

Recently, several sensors using conductive nanoparticles on flexible substrates have been developed for various healthcare wearable device applications. These sensors primarily use a change in electrical resistance or a change in electrical capacitance owing to deformation of the sensor structure (e.g., membrane) because of the external motion or force. In the flexible sensor development process, the change in the reference resistance, as well as the change owing to the deformation of the sensor during the measurement process, should be small. In this study, we introduced an electrode connection method using a contact probe that can reduce the resistance change owing to the deformation of the flexible membrane sensor and compared the change in reference resistance with the conventional large-area contact connection method. For the probe type, it was confirmed that the change in the reference resistance was reduced during the repeated process of attaching and detaching the sensor. The rate of change in the reference resistance before and after deformation by static vertical force was also reduced compared to the area type, and it was confirmed that it was maintained constant. Finally, the rate of change in the reference resistance of the probe type was confirmed to be reduced compared to the case of the area type owing to repeated impact force by a free-falling metal bead.

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Abbreviations

AgNW :

Silver nanowire

F v :

Applied vertical force

R ref_before :

Reference resistance before deformation

R ref_after :

Reference resistance after deformation

Δ R ref :

Change in reference resistance

Δ R ref/R ref_before :

Change rate of reference resistance

R 0 :

Initial resistance of senor

Δ R/R 0 :

Relative resistance change

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Acknowledgments

This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. NRF-2020R1F1A1050735) and Korea Basic Science Institute (National research Facilities and Equipment Center) grant funded by the Ministry of Education (No. 2019R1A6C1010045).

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Authors and Affiliations

  1. Division of Mechanical, Automotive and Robot Component Engineering, Dong-Eui University, 176 Eomgwang-Ro, Busanjin-Gu, Busan, 47340, Korea

    Dong Kwan Kang & Sangmin Lee

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  1. Dong Kwan Kang
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  2. Sangmin Lee
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Corresponding author

Correspondence to Sangmin Lee.

Additional information

Dong Kwan Kang is B.S. candidate in Division of Mechanical, Automotive, Robot Components Engineering, in Dong-Eui University. His research interest in MEMS and flexible sensors.

Sangmin Lee is Assistant Professor in Division of Mechanical, Automotive, Robot Components Engineering, Dong-Eui University. His research interest is MEMS and microfluidic system. He received his B.S. (2005) in Mechanical Engineering from Pusan National University and Ph.D. (2012) in Mechanical Engineering from Postech.

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Kang, D.K., Lee, S. Electrode connection to reduce the variation of electrical resistance owing to deformation of a flexible sensor. J Mech Sci Technol 36, 3097–3101 (2022). https://doi.org/10.1007/s12206-022-0540-9

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  • DOI: https://doi.org/10.1007/s12206-022-0540-9

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