A Wearable Hydration Sensor with Conformal Nanowire Electrodes
Abstract
A wearable skin hydration sensor in the form of a capacitor is demonstrated based on skin impedance measurement. The capacitor consists of two interdigitated or parallel electrodes that are made of silver nanowires (AgNWs) in a polydimethylsiloxane (PDMS) matrix. The flexible and stretchable nature of the AgNW/PDMS electrode allows conformal contact to the skin. The hydration sensor is insensitive to the external humidity change and is calibrated against a commercial skin hydration system on an artificial skin over a wide hydration range. The hydration sensor is packaged into a flexible wristband, together with a network analyzer chip, a button cell battery, and an ultralow power microprocessor with Bluetooth. In addition, a chest patch consisting of a strain sensor, three electrocardiography electrodes, and a skin hydration sensor is developed for multimodal sensing. The wearable wristband and chest patch may be used for low‐cost, wireless, and continuous monitoring of skin hydration and other health parameters.
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The authors' group has recently demonstrated monitoring of skin humidity using a compliant AgNW/PDMS based interdigitated electrode.
“our group has recently demonstrated the moni toring of skin humidity using a compliant AgNW/PDMS based interdigitated electrode.[42]”
From Nanomaterial-Enabled Wearable Sensors for Healthcare (2018) · cites this paper as [42]
The resulting skin hydration sensor is stretchable, low-cost and suitable for long-term hydration sensing.
“The resulting skin hydration sensor is stretchable, low-cost and suitable for long-term hydration sensing.”
From Nanomaterial-Enabled Wearable Sensors for Healthcare (2018) · cites this paper as [42]
Our group has recently demonstrated a wearable chest patch that integrated three AgNW/PDMS dry electrodes, a AgNW/Ecoflex/AgNW capacitive strain sensor, and a AgNW/PDMS based interdigitated skin hydration sensor.
“With the AgNW/PDMS stretchable conductors, [24] our group has recently demonstrated a wearable chest patch (Figure 8a) that integrated three AgNW/PDMS dry electrodes, a AgNW/ Ecoflex/AgNW capacitive strain sensor, and a AgNW/PDMS based interdigitated skin hydration sensor.[42]”
From Nanomaterial-Enabled Wearable Sensors for Healthcare (2018) · cites this paper as [42]
Wireless transmission capability can be enabled by integrating an antenna or a Bluetooth module.
“Wireless transmission capability can be enabled by integrating an antenna [169,175,176] or a Bluetooth module.[42,45,119,175]”
From Nanomaterial-Enabled Wearable Sensors for Healthcare (2018) · cites this paper as [42]
Other components including a battery, data processing units, and a Bluetooth module were also integrated with the patch to enable wireless and concurrent monitoring of ECG, body movements, and skin hydration.
“Other components including a battery, data processing units, and a Bluetooth module were also integrated with the patch to enable wireless and concurrent monitoring of ECG, body movements, and skin hydration.”
From Nanomaterial-Enabled Wearable Sensors for Healthcare (2018) · cites this paper as [42]
Cites
Kim, D.-H., Lu, N., Ma, R., Kim, Y.-S., Kim, R.-H., Wang, S., Wu, J., Won, S. M., Tao, H., Islam, A., et al. (2011) · Science · doi:10.1126/science.1206157 · Cited by 4,836 · see citing works
Medical Instrumentation-Application and Design
Webster, J. G. (1978) · Journal of Clinical Engineering · doi:10.1097/00004669-197807000-00017 · Cited by 1,849 · see citing works
Highly Conductive and Stretchable Silver Nanowire Conductors
Xu, F., & Zhu, Y. (2012) · Advanced Materials · doi:10.1002/adma.201201886 · Cited by 1,315 · see citing works
Self-citationUltrathin conformal devices for precise and continuous thermal characterization of human skin
Webb, R. C., Bonifas, A. P., Behnaz, A., Zhang, Y., Yu, K. J., Cheng, H., Shi, M., Bian, Z., Liu, Z., Kim, Y.-S., et al. (2013) · Nature Materials · doi:10.1038/nmat3755 · Cited by 1,229 · see citing works
Wearable multifunctional sensors using printed stretchable conductors made of silver nanowires
Yao, S., & Zhu, Y. (2014) · Nanoscale · doi:10.1039/c3nr05496a · Cited by 1,028 · see citing works
Self-citationFlexible transparent conductive materials based on silver nanowire networks: a review
Langley, D., Giusti, G., Mayousse, C., Celle, C., Bellet, D., & Simonato, J. (2013) · Nanotechnology · doi:10.1088/0957-4484/24/45/452001 · Cited by 711 · see citing works
Nanomaterial‐Enabled Stretchable Conductors: Strategies, Materials and Devices
Yao, S., & Zhu, Y. (2015) · Advanced Materials · doi:10.1002/adma.201404446 · Cited by 695 · see citing works
Self-citationImpermeable barrier films and protective coatings based on reduced graphene oxide
Su, Y., Kravets, V. G., Wong, S. L., Waters, J. P., Geim, A. K., & Nair, R. R. (2014) · Nature Communications · doi:10.1038/ncomms5843 · Cited by 655 · see citing works
EEMCO guidance for the assessment of stratum corneum hydration: electrical methods
Berardesca, E., & European Group for Efficacy Measurements on Cosmetics and Other Topical Products (EEMCO) (1997) · Skin Research and Technology · doi:10.1111/j.1600-0846.1997.tb00174.x · Cited by 493 · see citing works
Emotional sweating across the body: Comparing 16 different skin conductance measurement locations
van Dooren, M., de Vries, G.-J., & Janssen, J. H. (2012) · Physiology & Behavior · doi:10.1016/j.physbeh.2012.01.020 · Cited by 413 · see citing works
KLEINER, S. M. (1999) · Journal of the American Dietetic Association · doi:10.1016/s0002-8223(99)00048-6 · Cited by 333 · see citing works
Stretchable and Reversibly Deformable Radio Frequency Antennas Based on Silver Nanowires
Song, L., Myers, A. C., Adams, J. J., & Zhu, Y. (2014) · ACS Applied Materials & Interfaces · doi:10.1021/am405972e · Cited by 292 · see citing works
Self-citationStretch-Triggered Drug Delivery from Wearable Elastomer Films Containing Therapeutic Depots
Di, J., Yao, S., Ye, Y., Cui, Z., Yu, J., Ghosh, T. K., Zhu, Y., & Gu, Z. (2015) · ACS Nano · doi:10.1021/acsnano.5b03975 · Cited by 253 · see citing works
Self-citationFirst human experiments with a novel non-invasive, non-optical continuous glucose monitoring system
Caduff, A., Hirt, E., Feldman, Y. D., Ali, Z., & Heinemann, L. (2003) · Biosensors and Bioelectronics · doi:10.1016/s0956-5663(03)00196-9 · Cited by 248 · see citing works
Wearable silver nanowire dry electrodes for electrophysiological sensing
Myers, A. C., Huang, H., & Zhu, Y. (2015) · RSC Advances · doi:10.1039/c4ra15101a · Cited by 231 · see citing works
Self-citationDevelopment and characteristics of a biological tissue-equivalent phantom for microwaves
Ito, K., Furuya, K., Okano, Y., et al. (2000) · Electronics and Communications in Japan (Part I Communications) · doi:10.1002/1520-6424(200104)84:4 · Cited by 190 · see citing works
Validation of a new dielectric device to assess changes of tissue water in skin and subcutaneous fat
Nuutinen, J., Ikäheimo, R., & Lahtinen, T. (2004) · Physiological Measurement · doi:10.1088/0967-3334/25/2/004 · Cited by 167 · see citing works
Water, Other Fluids, and Fatal Coronary Heart Disease
Chan, J., Knutsen, S. F., Blix, G. G., Lee, J. W., & Fraser, G. E. (2002) · American Journal of Epidemiology · doi:10.1093/aje/155.9.827 · Cited by 165 · see citing works
Nanomaterial-Enabled Dry Electrodes for Electrophysiological Sensing: A Review
Yao, S., & Zhu, Y. (2016) · JOM · doi:10.1007/s11837-016-1818-0 · Cited by 165 · see citing works
Self-citationCaduff, A., Dewarrat, F., Talary, M., Stalder, G., Heinemann, L., & Feldman, Y. (2006) · Biosensors and Bioelectronics · doi:10.1016/j.bios.2006.01.031 · Cited by 155 · see citing works
The Clinical Value of the ECG in Noncardiac Conditions
van Mieghem, C. A. G., Sabbe, M. B., & Knockaert, D. C. (2004) · CHEST Journal · doi:10.1378/chest.125.4.1561 · Cited by 153 · see citing works
Epidermal Differential Impedance Sensor for Conformal Skin Hydration Monitoring
Huang, X. L., Yeo, W., Liu, Y., & Rogers, J. A. (2012) · Biointerphases · doi:10.1007/s13758-012-0052-8 · Cited by 146 · see citing works
Epidermal Impedance Sensing Sheets for Precision Hydration Assessment and Spatial Mapping
Huang, X. L., Cheng, H., Chen, K., Zhang, Y., Zhang, Y., Liu, Y., Zhu, C., Ouyang, S.-C., Kong, G., Yu, C., et al. (2013) · IEEE Transactions on Biomedical Engineering · doi:10.1109/tbme.2013.2264879 · Cited by 113 · see citing works
Effect of pressure and padding on motion artifact of textile electrodes
Cömert, A., Honkala, M., & Hyttinen, J. (2013) · BioMedical Engineering OnLine · doi:10.1186/1475-925x-12-26 · Cited by 111 · see citing works
Skin Membrane Electrical Impedance Properties under the Influence of a Varying Water Gradient
Björklund, S., Ruzgas, T. A., Nowacka, A., Dahi, I., Topgaard, D., Sparr, E., & Engblom, J. (2013) · Biophysical Journal · doi:10.1016/j.bpj.2013.05.008 · Cited by 93 · see citing works
Characteristics of skin admittance for dry electrodes and the measurement of skin moisturisation
Yamamoto, Y., & Yamamoto, T. (1986) · Medical & Biological Engineering & Computing · doi:10.1007/bf02441608 · Cited by 77 · see citing works
Dehydration: Biological Considerations, Age-Related Changes, and Risk Factors in Older Adults
Sheehy, C. M., Perry, P. A., & Cromwell, S. L. (1999) · Biological Research For Nursing · doi:10.1177/109980049900100105 · Cited by 57 · see citing works
Facts and Myths about Electrical Measurement of Stratum corneum Hydration State
Martinsen, Ø. G., & Grimnes, S. (2001) · Dermatology · doi:10.1159/000051604 · Cited by 50 · see citing works
Lymphedema: Presentation, Diagnosis, and Treatment
Kamali, P., & Lin, S. J. (2016) · Plastic & Reconstructive Surgery · doi:10.1097/prs.0000000000002136 · Cited by 45 · see citing works
Thin film non-symmetric microelectrode array for impedance monitoring of human skin
Ivanic, R., Novotny, I., Řeháček, V., et al. (2003) · Thin Solid Films · doi:10.1016/s0040-6090(03)00389-4 · Cited by 36 · see citing works
Understanding factors which influence permeability of silicones and their derivatives
Reeth, I. V., & Wilson, A. (1994) · Cosmetics and toiletries · Cited by 11 · see citing works
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Nanomaterial-Enabled Wearable Sensors for Healthcare
Yao, S., Swetha, P., & Zhu, Y. (2018) · Advanced Healthcare Materials · doi:10.1002/adhm.201700889 · Cited by 576 · see citing works
Self-citationThe emergence of AI-based wearable sensors for digital health technology: a review
Shajari, S., Kuruvinashetti, K., Komeili, A., & Sundararaj, U. (2023) · Sensors · doi:10.3390/s23239498 · Cited by 535 · see citing works
Wu, H., Yang, G., Zhu, K., Liu, S., Guo, W., Jiang, Z., & Li, Z. (2021) · Advanced Science · doi:10.1002/advs.202001938 · Cited by 395 · see citing works
Wearable and flexible sensors for user-interactive health-monitoring devices
Ha, M., Lim, S., & Ko, H. (2018) · Journal of Materials Chemistry B · doi:10.1039/c8tb01063c · Cited by 352 · see citing works
Flexible Carbon Nanotube-Based Polymer Electrode for Long-Term Electrocardiographic Recording
Chi, M., Zhao, J., Dong, Y., & Wang, X. (2019) · Materials · doi:10.3390/ma12060971 · Cited by 68 · see citing works
- Authors
- Yao, S., Myers, A., Malhotra, A., Lin, F., Bozkurt, A., Muth, J. F., & Zhu, Y.
- Affiliations
- North Carolina State University (US)
- Corresponding author
- Muth, John F.
- Zhu, Yong
- Venue
- Advanced Healthcare Materials
- Publisher
- Wiley
- Published
- 2017-01-27
- Volume
- 6
- Issue
- 6
- ISSN
- 2192-2640 (ISSN-L)
- 2192-2659
- OpenAlex
- W2582986071
- Cited by
- 213
- References
- 31
- Citations by year
- 2026: 10 · 2025: 13 · 2024: 14 · 2023: 24 · 2022: 37 · 2021: 30 · 2020: 24 · 2019: 36 · 2018: 17 · 2017: 8
- FWCI
- 10.46
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Advanced Healthcare Materials (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Foundation (EEC‐1160483)
- 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 › Engineering › Biomedical Engineering › Non-Invasive Vital Sign Monitoring
- Keywords
- wearable sensors, silver nanowires, skin impedance, interdigitated electrodes, flexible capacitive sensors, wireless health monitoring, multimodal sensing
- MeSH terms
- Organism Hydration Status, Wearable Electronic Devices, Electrodes, Humans, Silver, Nanowires, Wireless Technology
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