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Article

Stretchable Strain Sensor with Controllable Negative Resistance Sensitivity Coefficient Based on Patterned Carbon Nanotubes/Silicone Rubber Composites

by 1 and 2,*
1
School of Mechatronic Engineering, Xi’an Technological University, Xi’an 710021, China
2
Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education, Northwestern Polytechnical University, Xi’an 710072, China
*
Author to whom correspondence should be addressed.
Academic Editor: Beatriz Jurado Sánchez
Micromachines 2021, 12(6), 716; https://doi.org/10.3390/mi12060716
Received: 15 May 2021 / Revised: 13 June 2021 / Accepted: 17 June 2021 / Published: 19 June 2021
(This article belongs to the Special Issue Smart Devices and Systems for Vibration Sensing and Energy Harvesting)
In this paper, stretchable strain sensors with a controllable negative resistance sensitivity coefficient are firstly proposed. In order to realize the sensor with a negative resistance sensitivity coefficient, a stretchable stress sensor with sandwich structure is designed in this paper. Carbon nanotubes are added between two layers of silica gel. When the sensor is stretched, carbon nanotubes will be squeezed at the same time, so the sensor will show a resistance sensitivity coefficient that the resistance becomes smaller after stretching. First, nanomaterials are coated on soft elastomer, then a layer of silica gel is wrapped on the outside of the nanomaterials. In this way, similar to sandwich biscuits, a stretchable strain sensor with controllable negative resistance sensitivity coefficient has been obtained. Because the carbon nanotubes are wrapped between two layers of silica gel, when the silica gel is stretched, the carbon nanotubes will be squeezed longitudinally, which increases their density and resistance. Thus, a stretchable strain sensor with negative resistance sensitivity coefficient can be realized, and the resistivity can be controlled and adjusted from 12.7 Ω·m to 403.2 Ω·m. The sensor can be used for various tensile testing such as human motion monitoring, which can effectively expand the application range of conventional tensile strain sensor. View Full-Text
Keywords: strain sensor; negative resistance sensitivity coefficient; carbon nanotubes (CNTs) strain sensor; negative resistance sensitivity coefficient; carbon nanotubes (CNTs)
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MDPI and ACS Style

Dong, R.; Xie, J. Stretchable Strain Sensor with Controllable Negative Resistance Sensitivity Coefficient Based on Patterned Carbon Nanotubes/Silicone Rubber Composites. Micromachines 2021, 12, 716. https://doi.org/10.3390/mi12060716

AMA Style

Dong R, Xie J. Stretchable Strain Sensor with Controllable Negative Resistance Sensitivity Coefficient Based on Patterned Carbon Nanotubes/Silicone Rubber Composites. Micromachines. 2021; 12(6):716. https://doi.org/10.3390/mi12060716

Chicago/Turabian Style

Dong, Rong, and Jianbing Xie. 2021. "Stretchable Strain Sensor with Controllable Negative Resistance Sensitivity Coefficient Based on Patterned Carbon Nanotubes/Silicone Rubber Composites" Micromachines 12, no. 6: 716. https://doi.org/10.3390/mi12060716

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