A body area sensor network (bodyNET) is a collection of networked sensors that can be used to monitor human physiological signals. For its application in next-generation personalized healthcare systems, seamless hybridization of stretchable on-skin sensors and rigid silicon readout circuits is required. Here, we report a bodyNET composed of chip-free and battery-free stretchable on-skin sensor tags that are wirelessly linked to flexible readout circuits attached to textiles. Our design offers a conformal skin-mimicking interface by removing all direct contacts between rigid components and the human body. Therefore, this design addresses the mechanical incompatibility issue between soft on-skin devices and rigid high-performance silicon electronics. Additionally, we introduce an unconventional radiofrequency identification technology where wireless sensors are deliberately detuned to increase the tolerance of strain-induced changes in electronic properties. Finally, we show that our soft bodyNET system can be used to simultaneously and continuously analyse a person’s pulse, breath and body movement.
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The data that support the plots within this paper and other findings of this study are available from the corresponding authors upon reasonable request.
Yang, G. Z. Body Sensor Networks 2nd edn (Springer, 2014).
Hanson, M. A. et al. Body area sensor networks: challenges and opportunities. Computer 42, 58–65 (2009).
Chu, B., Burnett, W., Chung, J. W. & Bao, Z. Bring on the bodyNET. Nature 549, 328–330 (2017).
Gao, W. et al. Fully integrated wearable sensor arrays for multiplexed in situ perspiration analysis. Nature 529, 509–514 (2016).
Mukhopadhyay, S. C. Wearable sensors for human activity monitoring: a review. IEEE Sens. J. 15, 1321–1330 (2015).
Lee, H. et al. A graphene-based electrochemical device with thermoresponsive microneedles for diabetes monitoring and therapy. Nat. Nanotechnol. 11, 566–572 (2016).
Son, D. et al. Multifunctional wearable devices for diagnosis and therapy of movement disorders. Nat. Nanotechnol. 9, 397–404 (2014).
Yang, S. X. et al. ‘Cut-and-paste’ manufacture of multiparametric epidermal sensor systems. Adv. Mater. 27, 6423–6430 (2015).
Liu, Z. Y. et al. Thickness-gradient films for high gauge factor stretchable strain sensors. Adv. Mater. 27, 6230–6237 (2015).
Kim, J., Kumar, R., Bandodkar, A. J. & Wang, J. Advanced materials for printed wearable electrochemical devices: a review. Adv. Electron. Mater. 3, 1600260 (2017).
Liu, W., Song, M. S., Kong, B. & Cui, Y. Flexible and stretchable energy storage: recent advances and future perspectives. Adv. Mater. 29, 1603436 (2017).
Zamarayeva, A. M. et al. Flexible and stretchable power sources for wearable electronics. Sci. Adv. 3, e1602051 (2017).
Yi, F. et al. A highly shape-adaptive, stretchable design based on conductive liquid for energy harvesting and self-powered biomechanical monitoring. Sci. Adv. 2, e1501624 (2016).
Kaltenbrunner, M. et al. Ultrathin and lightweight organic solar cells with high flexibility. Nat. Commun. 3, 770 (2012).
Wang, S. H. et al. Skin electronics from scalable fabrication of an intrinsically stretchable transistor array. Nature 555, 83–88 (2018).
Andrews, J. B. et al. Patterned liquid metal contacts for printed carbon nanotube transistors. ACS Nano 12, 5482–5488 (2018).
Park, M. et al. Highly stretchable electric circuits from a composite material of silver nanoparticles and elastomeric fibres. Nat. Nanotechnol. 7, 803–809 (2012).
Larson, C. et al. Highly stretchable electroluminescent skin for optical signaling and tactile sensing. Science 351, 1071–1074 (2016).
Liang, J. J., Li, L., Niu, X. F., Yu, Z. B. & Pei, Q. B. Elastomeric polymer light-emitting devices and displays. Nat. Photon. 7, 817–824 (2013).
Keplinger, C. et al. Stretchable, transparent, ionic conductors. Science 341, 984–987 (2013).
Matsuhisa, N. et al. Printable elastic conductors by in situ formation of silver nanoparticles from silver flakes. Nat. Mater. 16, 834–840 (2017).
Trung, T. Q. & Lee, N. E. Flexible and stretchable physical sensor integrated platforms for wearable human-activity monitoring and personal healthcare. Adv. Mater. 28, 4338–4372 (2016).
Hartmann, F., Drack, M. & Kaltenbrunner, M. Meant to merge: fabrication of stretchy electronics for robotics. Sci. Robot. 3, eaat9091 (2018).
Sekitani, T. et al. Stretchable active-matrix organic light-emitting diode display using printable elastic conductors. Nat. Mater. 8, 494–499 (2009).
Kim, D. H. et al. Epidermal electronics. Science 333, 838–843 (2011).
Valentine, A. D. et al. Hybrid 3D printing of soft electronics. Adv. Mater. 29, 1703817 (2017).
van den Brand, J. et al. Flexible and stretchable electronics for wearable health devices. Solid State Electron. 113, 116–120 (2015).
Xu, S. et al. Soft microfluidic assemblies of sensors, circuits, and radios for the skin. Science 344, 70–74 (2014).
Huang, Z. et al. Three-dimensional integrated stretchable electronics. Nat. Electron. 1, 473–480 (2018).
Graz, I. M., Cotton, D. P. J., Robinson, A. & Lacour, S. P. Silicone substrate with in situ strain relief for stretchable thin-film transistors. Appl. Phys. Lett. 98, 124101 (2011).
Vanfleteren, J. et al. Printed circuit board technology inspired stretchable circuits. MRS Bull. 37, 254–260 (2012).
Han, S. et al. Battery-free, wireless sensors for full-body pressure and temperature mapping. Sci. Transl. Med. 10, eaan4950 (2018).
Kim, J. et al. Battery-free, stretchable optoelectronic systems for wireless optical characterization of the skin. Sci. Adv. 2, e1600418 (2016).
Bandodkar, A. J. et al. Battery-free, skin-interfaced microfluidic/electronic systems for simultaneous electrochemical, colorimetric, and volumetric analysis of sweat. Sci. Adv. 5, eaav3294 (2019).
Kim, J. et al. Epidermal electronics with advanced capabilities in near-field communication. Small 11, 906–912 (2015).
Paret, D. Antenna Designs for NFC Devices (Wiley, 2016).
Huang, X. et al. Stretchable, wireless sensors and functional substrates for epidermal characterization of sweat. Small 10, 3083–3090 (2014).
Brink, M., Muller, C. H. & Schierz, C. Contact-free measurement of heart rate, respiration rate, and body movements during sleep. Behav. Res. Methods 38, 511–521 (2006).
Chen, W. X. et al. Unconstrained monitoring of long-term heart and breath rates during sleep. Physiol. Meas. 29, N1–N10 (2008).
Dong, J. G. The role of heart rate variability in sports physiology. Exp. Ther. Med. 11, 1531–1536 (2016).
Bunde, A. et al. Correlated and uncorrelated regions in heart-rate fluctuations during sleep. Phys. Rev. Lett. 85, 3736–3739 (2000).
Sallen, R. P. & Key, E. L. A practical method of designing RC active filters. IEEE Trans. Circuit Theory 2, 74–85 (1955).
This research was supported by Samsung Electronics. X.C. acknowledges financial support from the Agency for Science, Technology and Research (A*STAR) under its AME Programmatic Funding Scheme (project no. A18A1b0045). N.M. acknowledges funding support from an overseas fellowship from the Japan Society for the Promotion of Science (JSPS). A.S.Y.P., Z.B. and N.M. acknowledge support from Stanford Precision Health and Integrated Diagnosis Center for seed funding support. The authors thank S. Taheri, W. Wang, J. Kim, B. Chu, Y. Zheng, J. Kang, Y. Kim, H.-C. Wu, J. Xu, T. Lei, Y. Liu, Z. Liu, G. Chen, Y. Jiang and B. Murmann for experimental assistance and insightful discussions. The authors also thank Dupont for providing the stretchable conductor inks.
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Supplementary Figs. 1–16, Supplementary Tables 1–2 and Supplementary Notes 1–2.
Display of pulse waves measured from our bodyNET by an oscilloscope.
A demonstration of a bodyNET containing five sensing nodes, including one pulse node, one breathing node and three body movement nodes.
A demonstration of a sensor node with a built-in seven-segment display to measure respiration.
A demonstration of a sensor node located at the neck to measure head movement.
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Niu, S., Matsuhisa, N., Beker, L. et al. A wireless body area sensor network based on stretchable passive tags. Nat Electron 2, 361–368 (2019). https://doi.org/10.1038/s41928-019-0286-2
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