Stretchable and Highly Sensitive Optical Strain Sensors for Human-Activity Monitoring and Healthcare
Abstract
Flexible and stretchable strain sensors are essential to developing smart wearable devices for monitoring human activities. Such sensors have been extensively exploited with various conductive materials and structures, which, however, are normally in need of complex manufacturing processes and confronted with the challenge to achieve both large stretchability and high sensitivity. Here, we report a simple and low-cost optical strategy for the design of stretchable strain sensors which are capable of measuring large strains of 100% with a low detection limit (±0.09%), a fast responsivity (<12 ms), and high reproducibility (over 6000 cycles). The optical strain sensor (OS 2 ) is fabricated by assembling plasmonic gold nanoparticles (GNPs) in stretchable elastomer-based optical fibers, where a core/cladding structure with step-index configuration is adopted for light confinement. The stretchable, GNP-incorporated optical fiber shows strong localized surface plasmon resonance effects that enable sensitive and reversible detection of strain deformations with high linearity and negligible hysteresis. The unique mechanical and sensing properties of the OS 2 enable its assembling into clothing or mounting on skin surfaces for monitoring various human activities from physiological signals as subtle as wrist pulses to large motions of joint bending and hand gestures. We further apply the OS 2 for quantitative analysis of motor disorders such as Parkinson’s disease and demonstrate its compatibility in strong electromagnetic interference environments during functional magnetic resonance imaging, showing great promises for diagnostics and assessments of motor neuron diseases in clinics.
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Plasmonic gold nanoparticles assembled into stretchable elastomer-based optical fibers with a core/cladding step-index configuration can produce strain sensors that measure large strains with low detection limit, fast responsivity, and high reproducibility.
“One experiment is assembling plasmonic gold nanoparticles (GNPs) into stretchable elastomer-based optical fibers with a core/cladding structure with a step-index configuration. This configuration can obtain strong localized surface plasmon resonance effects and can produce strain sensors that can measure large strains with a low detection limit, fast responsivity, and high reproducibility [230].”
From The Current State of Optical Sensors in Medical Wearables (2022) · cites this paper as [230]
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- Authors
- Guo, J., Zhou, B., Zong, R., Pan, L., Li, X., Yu, X., Yang, C., Kong, L., & Dai, Q.
- Affiliations
- Tsinghua University (CN)
- Chinese PLA General Hospital (CN)
- Corresponding author
- Kong, Lingjie
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-08-29
- Volume
- 11
- Issue
- 37
- Pages
- 33589-33598
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W2972811458
- Cited by
- 170
- References
- 59
- Citations by year
- 2026: 7 · 2025: 32 · 2024: 40 · 2023: 42 · 2022: 20 · 2021: 18 · 2020: 11
- FWCI
- 4.30
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- ACS Applied Materials & Interfaces (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Natural Science Foundation of China (61805126)
- Central Committee of the Communist Party of China
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Advanced Sensor and Energy Harvesting Materials
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced Fiber Optic Sensors
- Physical Sciences › Engineering › Biomedical Engineering › Non-Invasive Vital Sign Monitoring
- Keywords
- optical strain sensors, stretchable sensors, gold nanoparticles, localized surface plasmon resonance, elastomers, human activity monitoring, wearable devices, Parkinson's disease, motor disorders, functional MRI, electromagnetic interference, physiological signals
- MeSH terms
- Wearable Electronic Devices, Female, Gold, Humans, Middle Aged, Monitoring, Physiologic, Movement, Parkinson Disease, Exercise, Metal Nanoparticles, Optics and Photonics
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