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Article

A Pressure-Insensitive Self-Attachable Flexible Strain Sensor with Bioinspired Adhesive and Active CNT Layers

Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2020, 20(23), 6965; https://doi.org/10.3390/s20236965
Received: 9 November 2020 / Revised: 30 November 2020 / Accepted: 4 December 2020 / Published: 5 December 2020
(This article belongs to the Special Issue Carbon Nanotube and Graphene based Piezoresistive Sensors)
Flexible tactile sensors are required to maintain conformal contact with target objects and to differentiate different tactile stimuli such as strain and pressure to achieve high sensing performance. However, many existing tactile sensors do not have the ability to distinguish strain from pressure. Moreover, because they lack intrinsic adhesion capability, they require additional adhesive tapes for surface attachment. Herein, we present a self-attachable, pressure-insensitive strain sensor that can firmly adhere to target objects and selectively perceive tensile strain with high sensitivity. The proposed strain sensor is mainly composed of a bioinspired micropillar adhesive layer and a selectively coated active carbon nanotube (CNT) layer. We show that the bioinspired adhesive layer enables strong self-attachment of the sensor to diverse planar and nonplanar surfaces with a maximum adhesion strength of 257 kPa, while the thin film configuration of the patterned CNT layer enables high strain sensitivity (gauge factor (GF) of 2.26) and pressure insensitivity. View Full-Text
Keywords: adhesives; bioinspired microstructures; carbon nanotubes; flexible sensors; strain sensors adhesives; bioinspired microstructures; carbon nanotubes; flexible sensors; strain sensors
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MDPI and ACS Style

Seong, M.; Hwang, I.; Lee, J.; Jeong, H.E. A Pressure-Insensitive Self-Attachable Flexible Strain Sensor with Bioinspired Adhesive and Active CNT Layers. Sensors 2020, 20, 6965. https://doi.org/10.3390/s20236965

AMA Style

Seong M, Hwang I, Lee J, Jeong HE. A Pressure-Insensitive Self-Attachable Flexible Strain Sensor with Bioinspired Adhesive and Active CNT Layers. Sensors. 2020; 20(23):6965. https://doi.org/10.3390/s20236965

Chicago/Turabian Style

Seong, Minho, Insol Hwang, Joosung Lee, and Hoon E. Jeong. 2020. "A Pressure-Insensitive Self-Attachable Flexible Strain Sensor with Bioinspired Adhesive and Active CNT Layers" Sensors 20, no. 23: 6965. https://doi.org/10.3390/s20236965

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