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Micromachines 2017, 8(12), 356; https://doi.org/10.3390/mi8120356

Arrayed Force Sensors Made of Paper, Elastomer, and Hydrogel Particles

Department of Mechanical and Aerospace Engineering, Rutgers University, 98 Brett Road, Piscataway, NJ 08854, USA
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Received: 6 September 2017 / Revised: 2 December 2017 / Accepted: 4 December 2017 / Published: 8 December 2017
(This article belongs to the Special Issue Paper-Based Transducers and Electronics)
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Abstract

This article presents a sensor for detecting the distribution of forces on a surface. The device with nine buttons consisted of an elastomer-based layer as a touch interface resting on a substrate of patterned metallized paper. The elastomer-based layer included a three-by-three array of deformable, hemispherical elements/reliefs, facing down toward an array of interdigitated capacitive sensing units on patterned metallized paper. Each hemispherical element is 20 mm in diameter and 8 mm in height. When a user applied pressure to the elastomer-based layer, the contact area between the hemispherical elements and the interdigitated capacitive sensing units increased with the deformation of the hemispherical elements. To enhance the sensitivity of the sensors, embedded particles of hydrogel in the elastomer-based layer increased the measured electrical responses. The measured capacitance increased because the effective dielectric permittivity of the hydrogel was greater than that of air. Electromechanical characterization verified that the hydrogel-filled elastomer was more sensitive to force at a low range of loads (23.4 pF/N) than elastomer alone without embedded hydrogel (3.4 pF/N), as the hydrogel reduced the effective elastic modulus of the composite material by a factor of seven. A simple demonstration suggests that the force-sensing array has the potential to contribute to wearable and soft robotic devices. View Full-Text
Keywords: electronic skin; paper-based electronics; force sensor; hydrogel; elastomer electronic skin; paper-based electronics; force sensor; hydrogel; elastomer
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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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Zou, X.; Liang, T.; Lopez, N.; Ahmed, M.; Ajayan, A.; Mazzeo, A.D. Arrayed Force Sensors Made of Paper, Elastomer, and Hydrogel Particles. Micromachines 2017, 8, 356.

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