Extremely Elastic Wearable Carbon Nanotube Fiber Strain Sensor for Monitoring of Human Motion
Abstract
The increasing demand for wearable electronic devices has made the development of highly elastic strain sensors that can monitor various physical parameters an essential factor for realizing next generation electronics. Here, we report an ultrahigh stretchable and wearable device fabricated from dry-spun carbon nanotube (CNT) fibers. Stretching the highly oriented CNT fibers grown on a flexible substrate (Ecoflex) induces a constant decrease in the conductive pathways and contact areas between nanotubes depending on the stretching distance; this enables CNT fibers to behave as highly sensitive strain sensors. Owing to its unique structure and mechanism, this device can be stretched by over 900% while retaining high sensitivity, responsiveness, and durability. Furthermore, the device with biaxially oriented CNT fiber arrays shows independent cross-sensitivity, which facilitates simultaneous measurement of strains along multiple axes. We demonstrated potential applications of the proposed device, such as strain gauge, single and multiaxial detecting motion sensors. These devices can be incorporated into various motion detecting systems where their applications are limited to their strain.
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Strain sensors fabricated by dry-spinning CNT fibers onto a prestrained (100%) Ecoflex substrate exhibited a GF of 0.54 for strain below 400% and 64 for strain between 400% and 960%.
“Strain sensors fabricated by dry-spinning CNT fibers onto a prestrained (100%) Ecoflex substrate exhibited a GF of 0.54 for strain below 400% and 64 for strain between 400% and 960% (Figure 4a).[53]”
From Nanomaterial-Enabled Wearable Sensors for Healthcare (2018) · cites this paper as [53]
Dry-spun CNT fibers were able to detect biaxial strain up to 200% with low cross-sensitivity between the two axes.
“A similar idea was applied for dry-spun CNT fibers, [53] which was able to detect biaxial strain up to 200% with a low cross-sensitivity between the two axes.”
From Nanomaterial-Enabled Wearable Sensors for Healthcare (2018) · cites this paper as [53]
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- Authors
- Ryu, S., Lee, P., Chou, J. B., Xu, R., Zhao, R., Hart, A. J., & Kim, S.-G.
- Affiliations
- Singapore University of Technology and Design (SG)
- Massachusetts Institute of Technology (US)
- Corresponding author
- Kim, Sang-Gook
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-06-09
- Volume
- 9
- Issue
- 6
- Pages
- 5929-5936
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2404934666
- Cited by
- 770
- References
- 39
- Citations by year
- 2026: 31 · 2025: 45 · 2024: 69 · 2023: 51 · 2022: 61 · 2021: 97 · 2020: 92 · 2019: 118 · 2018: 96 · 2017: 66 · 2016: 41 · 2015: 3
- FWCI
- 34.17
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- ACS Nano (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Massachusetts Institute of Technology
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Advanced Sensor and Energy Harvesting Materials
- Physical Sciences › Materials Science › Materials Chemistry › Carbon Nanotubes in Composites
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Nanomaterials and Printing Technologies
- Keywords
- carbon nanotube fibers, strain sensors, wearable electronics, stretchable sensors, human motion monitoring, cross-sensitivity, conductive pathways, motion sensors
- MeSH terms
- Clothing, Elasticity, Electronics, Humans, Monitoring, Physiologic, Movement, Nanotechnology, Nanotubes, Carbon
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