A Polyimide Based Force Sensor Fabricated Using Additive Screen-Printing Process for Flexible Electronics

Dinesh Maddipatla; Xingzhe Zhang; Arnesh K. Bose; Simin Masihi; Binu B. Narakathu; Bradley J. Bazuin; John D. Williams; Michael F. Mitchell; Massood Z. Atashbar

doi:10.1109/ACCESS.2020.3037703

IEEE Access (Jan 2020)

A Polyimide Based Force Sensor Fabricated Using Additive Screen-Printing Process for Flexible Electronics

Dinesh Maddipatla,
Xingzhe Zhang,
Arnesh K. Bose,
Simin Masihi,
Binu B. Narakathu,
Bradley J. Bazuin,
John D. Williams,
Michael F. Mitchell,
Massood Z. Atashbar

Affiliations

Dinesh Maddipatla: ORCiD; Department of Electrical and Computer Engineering, Western Michigan University, Kalamazoo, MI, USA
Xingzhe Zhang: ORCiD; Department of Electrical and Computer Engineering, Western Michigan University, Kalamazoo, MI, USA
Arnesh K. Bose: ORCiD; Department of Electrical and Computer Engineering, Western Michigan University, Kalamazoo, MI, USA
Simin Masihi: ORCiD; Department of Electrical and Computer Engineering, Western Michigan University, Kalamazoo, MI, USA
Binu B. Narakathu: ORCiD; Department of Electrical and Computer Engineering, Western Michigan University, Kalamazoo, MI, USA
Bradley J. Bazuin: ORCiD; Department of Electrical and Computer Engineering, Western Michigan University, Kalamazoo, MI, USA
John D. Williams: Additive Electronics Technology (AET) Group, Boeing Research and Technology, The Boeing Company, Huntsville, AL, USA
Michael F. Mitchell: Additive Electronics Technology (AET) Group, Boeing Research and Technology, The Boeing Company, Huntsville, AL, USA
Massood Z. Atashbar: ORCiD; Additive Electronics Technology (AET) Group, Boeing Research and Technology, The Boeing Company, Huntsville, AL, USA

DOI: https://doi.org/10.1109/ACCESS.2020.3037703
Journal volume & issue: Vol. 8
pp. 207813 – 207821

Abstract

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A flexible capacitive force sensor was developed for force sensing applications. The force sensor consists of two electrodes and a dielectric layer. The electrodes were fabricated by depositing conductive silver (Ag) ink on a flexible polyimide platform using screen-printing process. The dielectric layer was prepared by mixing the contents of polydimethylsiloxane (PDMS) (pre-polymer and curing agent) in a 16:1 ratio. Then the PDMS dielectric layer was sandwiched between the screen-printed Ag electrodes. The capability of the fabricated force sensor was investigated by recording its capacitive response for varying applied forces of 100 N. It was observed that the capacitance increased from 5.83 pF to 6.36 pF as the force was increased from 0 N (no load) to 100 N. A sensitivity and correlation coefficient of 0.081%N-1 and 0.998 were calculated for the force sensor. In addition, a response time and recovery time of 3.7 seconds and 5.7 seconds was measured for the fabricated force sensor. The relative humidity (% RH) tests performed from 20% RH to 80% RH, in steps of 20% RH, revealed that there was a minimal effect of RH on the base capacitance of the force sensor at room temperature.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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