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Vertical CNT-Ecoflex Nanofins for Highly Linear Broad-Range-Detection Wearable Strain Sensor

Abstract

Strain sensors with broad sensing range, high sensitivity and linearity are highly desirable in health monitoring systems to detect both large strains and subtle strains. However, few strain sensors demonstrated the same high sensitivity at both large strain and subtle strain. In this work, we report a highly linear and broad-range-detection strain sensor by designing a fin-like microstructure, which combines the advantages of vertical carbon nanotubes (CNTs) and Ecoflex. In the proposed structure, most of the vertically grown CNTs are wrapped by polymer to form CNT-Ecoflex Nanofin (CEN) matrix, while some of the vertical CNTs at the edge of the CENs protrude, like spines on the fin. These exposed CNT spines can effectively improve the sensitivity, especially in small strain. In the CEN structure, the existence of Ecoflex resists the shifting and breaking of CNTs under cyclic strains, which ensure the stretchability and reliability. The unique CEN structure enables the sensor to obtain excellent linearity (R2 > 0.99) under the strain range of 0 to 250% and high sensitivities ( from 3 to 18) with a wide sensing range (from 0.1% to 500%). Most importantly, the specification of the strain sensors can be tuned by controlling the lengths and densities of CNTs. These virtues endow the sensor with great application prospects in wearable electronics and health monitoring.

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Publication details

The article was received on 04 Dec 2017, accepted on 11 Apr 2018 and first published on 16 Apr 2018


Article type: Paper
DOI: 10.1039/C7TC05571D
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Vertical CNT-Ecoflex Nanofins for Highly Linear Broad-Range-Detection Wearable Strain Sensor

    S. Zhang, L. Wen, H. Wang, K. Zhu and M. Zhang, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC05571D

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