A highly sensitive and flexible pressure sensor with electrodes and elastomeric interlayer containing silver nanowires
Abstract
The next-generation application of pressure sensors is gradually being extended to include electronic artificial skin (e-skin), wearable devices, humanoid robotics and smart prosthetics. In these advanced applications, high sensing capability is an essential feature for high performance. Although surface patterning treatments and some special elastomeric interlayers have been applied to improve sensitivity, the process is complex and this inevitably raises the cost and is an obstacle to large-scale production. In the present study a simple printing process without complex patterning has been used for constructing the sensor, and an interlayer is employed comprising elastomeric composites filled with silver nanowires. By increasing the relative permittivity, εr, of the composite interlayer induced by compression at high nanowire concentration, it has been possible to achieve a maximum sensitivity of 5.54 kPa(-1). The improvement in sensitivity did not sacrifice or undermine the other features of the sensor. Thanks to the silver nanowire electrodes, the sensor is flexible and stable after 200 cycles at a bending radius of 2 mm, and exhibits outstanding reproducibility without hysteresis under similar pressure pulses. The sensor has been readily integrated onto an adhesive bandage and has been successful in detecting human movements. In addition to measuring pressure in direct contact, non-contact pressures such as air flow can also be detected.
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Adding conductive fillers into the dielectric just below the percolation threshold increases the effective dielectric constant, because compression shortens the distance between the fillers, leading to an increased dielectric constant under pressure.
“Another strategy to increase the effective dielectric constant is to add conductive fillers into the dielectric just below the percolation threshold.[153] Compression shortens the distance between the fillers, leading to an increased dielectric constant under pressure.”
From Nanomaterial-Enabled Wearable Sensors for Healthcare (2018) · cites this paper as [153]
Wearable strain sensors with a large strain detection range are widely used to monitor body motions, including finger bending, forearm muscle movements, and knee motions.
“Wearable strain sensors with a large strain detection range are widely used to monitor body motions, including finger bending, [41,52,120,123,126] forearm muscle movements, [21,44,52,103,120,123,153] and knee motions.[41,121,153]”
From Nanomaterial-Enabled Wearable Sensors for Healthcare (2018) · cites this paper as [153]
A multitude of pressure sensing arrays have been demonstrated to capture the spatial pressure distributions induced by different sources, such as a static object placed onto the sensing array, gas flow, bouncing of a water droplet, finger touch, and acoustic vibration.
“A multitude of pressure sensing arrays have been demonstrated to capture the spatial pressure distributions induced by different sources, such as a static object placed onto the sensing array, [57,139,141,158,203] gas flow, [141,144,153] bouncing of a water droplet (Figure 11a), [139] finger touch, [144,161] and acoustic vibration.[144,203]”
From Nanomaterial-Enabled Wearable Sensors for Healthcare (2018) · cites this paper as [153]
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- Authors
- Wang, J., Jiu, J., Nogi, M., Sugahara, T., Nagao, S., Koga, H., He, P., & Suganuma, K.
- Affiliations
- Harbin Institute of Technology (CN)
- The Institute of Scientific and Industrial Research, The University of Osaka (JP)
- Corresponding author
- Jiu, Jinting
- He, Peng
- ORCID
- Venue
- Nanoscale
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2015
- Volume
- 7
- Issue
- 7
- Pages
- 2926-2932
- ISSN
- 2040-3364 (ISSN-L)
- 2040-3372
- OpenAlex
- W1966066957
- Cited by
- 293
- References
- 28
- Citations by year
- 2026: 8 · 2025: 15 · 2024: 17 · 2023: 19 · 2022: 26 · 2021: 37 · 2020: 39 · 2019: 37 · 2018: 28 · 2017: 37 · 2016: 19 · 2015: 10
- FWCI
- 11.42
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Nanoscale (publishedVersion)
- PubMed (publishedVersion)
- Funders
- China Scholarship Council
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Advanced Sensor and Energy Harvesting Materials
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Nanomaterials and Printing Technologies
- Physical Sciences › Computer Science › Computer Networks and Communications › Sensor Technology and Measurement Systems
- Keywords
- pressure sensors, silver nanowires, printed electrodes, dielectric constant, sensor sensitivity, flexible electronics, electronic skin, wearable devices, human motion monitoring, bending stability
- MeSH terms
- Arm, Elasticity, Electrodes, Electronics, Equipment Design, Fingers, Humans, Leg, Materials Testing, Polyethylene Terephthalates, Pressure, Robotics, Sensitivity and Specificity, Silver, Surface Properties, Reproducibility of Results, Skin, Artificial, Monitoring, Ambulatory, Elastomers, Electric Capacitance, Nanotechnology, Metal Nanoparticles, Nanowires
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