Triboelectric gait sensing analysis system for self-powered IoT-based human motion monitoring

Abstract

Quantitative analysis of gait parameters, such as stride frequency and step speed, is essential for optimizing physical exercise for the human body. However, the current electronic sensors used in human motion monitoring remain constrained by factors such as battery life and accuracy. This study developed a self-powered gait analysis system (SGAS) based on a triboelectric nanogenerator (TENG) fabricated electrospun composite nanofibers for motion monitoring and gait analysis for regulating exercise programs. The SGAS consists of a sensing module, a charging module, a data acquisition and processing module, and an Internet of Things (IoT) platform. Within the sensing module, two specialized sensing units, TENG-S1 and TENG-S2, are positioned at the forefoot and heel to generate synchronized signals in tandem with the user's footsteps. These signals are instrumental for real-time step count and step speed monitoring. The output of the two TENG units is significantly improved by systematically investigating and optimizing the electrospun composite nanofibers' composition, strength, and wear resistance. Additionally, a charge amplifier circuit is implemented to process the raw voltage signal, consequently bolstering the reliability of the sensing signal. This refined data is then ready for further reading and calculation by the micro-controller unit (MCU) during the signal transmission process. Finally, the well-conditioned signals are wirelessly transmitted to the IoT platform for data analysis, storage, and visualization, enhancing human motion monitoring.

Keywords

electrospun nanofiber / gait analysis / human motion monitoring / self-powered system / wearable triboelectric sensor

References

[1] Wang S, Fang Y, He H, Zhang L, Li C, Ouyang J. Wearable stretchable dry and self-adhesive strain sensors with conformal contact to skin for high-quality motion monitoring. Adv Funct Mater. 2021;31(5):2007495.

[2] Zhang Q, Li L, Wang T, et al. Self-sustainable flow-velocity detection via electromagnetic/triboelectric hybrid generator aiming at IoT-based environment monitoring. Nano Energy. 2021;90:106501.

[3] Tan C, Dong Z, Li Y, et al. A high performance wearable strain sensor with advanced thermal management for motion monitoring. Nat Commun. 2020;11(1):1-10.

[4] Zhang Q, Jin T, Cai J, et al. Wearable triboelectric sensors enabled gait analysis and waist motion capture for IoT- based smart healthcare applications. Adv Sci. 2022;9(4):2103694.

[5] Hernández-Santos C, Davizón YA, Said AR, Soto R, Félix-Herrán LC, Vargas-Martínez A. Development of a wearable finger exoskeleton for rehabilitation. Appl Sci. 2021;11(9):4145.

[6] Adans-Dester C, Hankov N, O'Brien A, et al. Enabling precision rehabilitation interventions using wearable sensors and machine learning to track motor recovery. NPJ Digit Med. 2020;3(1):1-10.

[7] Xu Q, Fang Y, Jing Q, et al. A portable triboelectric spirometer for wireless pulmonary function monitoring. Biosens Bioelectron. 2021;187:113329.

[8] Chittibabu SK, Chintagumpala K, Chandrasekhar A. A portable triboelectric spirometer for wireless pulmonary function monitoring. Mater Sci Semicond Process. 2022;151:106976.

[9] Yin R, Wang D, Zhao S, Lou Z, Shen G. Wearable sensors-enabled human–machine interaction systems: from design to application. Adv Funct Mater. 2021;31(11):2008936.

[10] An T, Anaya DV, Gong S, et al. Self-powered gold nanowire tattoo triboelectric sensors for soft wearable human-machine interface. Nano Energy. 2020;77:105295.

[11] Golparvar AJ, Yapici MK. Toward graphene textiles in wearable eye tracking systems for human–machine interaction. Beilstein J Nanotechnol. 2021;12(1):180-189.

[12] Zhu M, Sun Z, Zhang Z, et al. Haptic-feedback smart glove as a creative human-machine interface (HMI) for virtual/augmented reality applications. Sci Adv. 2020;6(19):eaaz8693.

[13] Zhang Z, He T, Zhu M, et al. Deep learning-enabled triboelectric smart socks for IoT-based gait analysis and VR applications. npj Flex Electron. 2020;4(1):29.

[14] Sukumaran C, Viswanathan P, Munirathinam P, Chandrasekhar A. A flexible and wearable joint motion sensor using triboelectric nanogenerators for hand gesture monitoring. Int J Nanotechnol. 2021;18(5–8):697-704.

[15] Rovini E, Maremmani C, Cavallo F. A wearable system to objectify assessment of motor tasks for supporting Parkinson's disease diagnosis. Sensors. 2020;20(9):2630.

[16] Chen G, Au C, Chen J. Textile triboelectric nanogenerators for wearable pulse wave monitoring. Trends Biotechnol. 2021;39(10):1078-1092.

[17] Wang Y, Chao M, Wan P, Zhang L. A wearable breathable pressure sensor from metal-organic framework derived nanocomposites for highly sensitive broad-range healthcare monitoring. Nano Energy. 2020;70:104560.

[18] Kwon KY, Shin YJ, Shin JH, et al. Stretchable, patch-type calorie-expenditure measurement device based on pop-up shaped nanoscale crack-based sensor. Adv Healthc Mater. 2019;8(19):1801593.

[19] Munirathinam P, Mathew AA, Shanmugasundaram V, et al. A comprehensive review on triboelectric nanogenerators based on real-time applications in energy harvesting and self-powered sensing. Mater Sci Eng B. 2023;297:116762.

[20] Liu L, Guo X, Lee C. Promoting smart cities into the 5G era with multi-field Internet of Things (IoT) applications powered with advanced mechanical energy harvesters. Nano Energy. 2021;88:106304.

[21] Chen P, An J, Shu S, et al. Super-durable, low-wear, and high-performance fur-brush triboelectric nanogenerator for wind and water energy harvesting for smart agriculture. Adv Energy Mater. 2021;11(9):2003066.

[22] Liu D, Yin X, Guo H, et al. A constant current triboelectric nanogenerator arising from electrostatic breakdown. Sci Adv. 2019;5(4):eaav6437.

[23] Basith SA, Chandrasekhar A. COVID-19 clinical waste reuse: a triboelectric touch sensor for IoT-cloud supported smart hand sanitizer dispenser. Nano Energy. 2023;108:108183.

[24] He T, Shi Q, Wang H, et al. Beyond energy harvesting-multi-functional triboelectric nanosensors on a textile. Nano Energy. 2019;57:338-352.

[25] Wu Z, Cheng T, Wang ZL. Self-powered sensors and systems based on nanogenerators. Sensors. 2020;20(10):2925.

[26] Sun Z, Zhu M, Zhang Z, et al. Artificial Intelligence of Things (AIoT) enabled virtual shop applications using self-powered sensor enhanced soft robotic manipulator. Adv Sci. 2021;8(14):2100230.

[27] Luo J, Wang Z, Xu L, et al. Flexible and durable wood-based triboelectric nanogenerators for self-powered sensing in athletic big data analytics. Nat Commun. 2019;10(1):5147.

[28] Wu C, Wang AC, Ding W, Guo H, Wang ZL. Triboelectric nanogenerator: a foundation of the energy for the new era. Adv Energy Mater. 2019;9(1):1802906.

[29] Jiang D, Ouyang H, Shi B, et al. A wearable noncontact free-rotating hybrid nanogenerator for self-powered electronics. InfoMat. 2020;2(6):1191-1200.

[30] Lin Z, Wu Z, Zhang B, et al. A triboelectric nanogenerator-based smart insole for multifunctional gait monitoring. Adv Mater Technol. 2019;4(2):1800360.

[31] Deng C, Tang W, Liu L, Chen B, Li M, Wang ZL. Self-powered insole plantar pressure mapping system. Adv Funct Mater. 2018;28(29):1801606.

[32] Zhu M, Shi Q, He T, et al. Self-powered and self-functional cotton sock using piezoelectric and triboelectric hybrid mechanism for healthcare and sports monitoring. ACS Nano. 2019;13(2):1940-1952.

[33] Tao K, Chen Z, Yi H, et al. Hierarchical honeycomb-structured electret/triboelectric nanogenerator for biomechanical and morphing wing energy harvesting. Nanomicro Lett. 2021;13(1):123.

[34] Zeng W, Tao XM, Chen S, Shang S, Chan HLW, Choy SH. Highly durable all-fiber nanogenerator for mechanical energy harvesting. Energ Environ Sci. 2013;6(9):2631-2638.

[35] Rasel MS, Maharjan P, Salauddin M, et al. An impedance tunable and highly efficient triboelectric nanogenerator for large-scale, ultra-sensitive pressure sensing applications. Nano Energy. 2018;49:603-613.

[36] Zhang Q, Xin C, Shen F, et al. Human body IoT systems based on the triboelectrification effect: energy harvesting, sensing, interfacing and communication. Energ Environ Sci. 2022;15(9):3688-3721.

[37] Guo H, Li T, Cao X, et al. Self-sterilized flexible single-electrode triboelectric nanogenerator for energy harvesting and dynamic force sensing. ACS Nano. 2017;11(1):856-864.

[38] Chen SW, Cao X, Wang N, et al. An ultrathin flexible single-electrode triboelectric-nanogenerator for mechanical energy harvesting and instantaneous force sensing. Adv Energy Mater. 2017;7(1):1601255.

[39] Wang X, Que M, Chen M, et al. Full dynamic-range pressure sensor matrix based on optical and electrical dual-mode sensing. Adv Mater. 2017;29(15):1605817.

[40] Lin Z, Yang J, Li X, et al. Large-scale and washable smart textiles based on triboelectric nanogenerator arrays for self-powered sleeping monitoring. Adv Funct Mater. 2018;28(1):1704112.

[41] Ha M, Lim S, Cho S, et al. Skin-inspired hierarchical polymer architectures with gradient stiffness for spacer-free, ultrathin, and highly sensitive triboelectric sensors. ACS Nano. 2018;12(4):3964-3974.

[42] Tao J, Bao R, Wang X, et al. Self-powered tactile sensor array systems based on the triboelectric effect. Adv Funct Mater. 2019;29(41):1806379.

[43] Chen S, Wu N, Ma L, et al. Noncontact heartbeat and respiration monitoring based on a hollow microstructured self-powered pressure sensor. ACS Appl Mater Interfaces. 2018;10(4):3660-3667.

[44] Yang P, Shi Y, Li S, et al. Monitoring the degree of comfort of shoes in-motion using triboelectric pressure sensors with an ultrawide detection range. ACS Nano. 2022;16(3):4654-4665.

[45] An J, Chen P, Wang Z, et al. Biomimetic hairy whiskers for robotic skin tactility. Adv Mater. 2021;33(24):2101891.

[46] Lai YC, Deng J, Zhang SL, Niu S, Guo H, Wang ZL. Single-thread-based wearable and highly stretchable triboelectric nanogenerators and their applications in cloth-based self-powered human-interactive and biomedical sensing. Adv Funct Mater. 2017;27(1):1604462.

[47] Wang H, Cheng J, Wang Z, Ji L, Wang ZL. Triboelectric nanogenerators for human-health care. Sci Bull. 2021;66(5):490-511.

[48] Liu M, Pu X, Jiang C, et al. Large-area all-textile pressure sensors for monitoring human motion and physiological signals. Adv Mater. 2017;29(41):1703700.

[49] Wei C, Cheng R, Ning C, et al. A self-powered body motion sensing network integrated with multiple triboelectric fabrics for biometric gait recognition and auxiliary rehabilitation training. Adv Funct Mater. 2023;33(35):2303562.

[50] Ma Z, Huang Q, Xu Q, et al. Permeable superelastic liquid-metal fibre mat enables biocompatible and monolithic stretchable electronics. Nat Mater. 2021;20(6):859-868.

[51] Gao H, Hu M, Ding J, et al. Investigation of contact electrification between 2D MXenes and MoS₂ through density functional theory and triboelectric probes. Adv Funct Mater. 2023;33(15):2213410.

[52] Yin X, Liu D, Zhou L, et al. A motion vector sensor via direct-current triboelectric nanogenerator. Adv Funct Mater. 2020;30(34):2002547.

[53] Sun N, Wang GG, Zhao HX, et al. Waterproof, breathable and washable triboelectric nanogenerator based on electrospun nanofiber films for wearable electronics. Nano Energy. 2021;90:106639.

[54] Zeng W, Shu L, Li Q, Chen S, Wang F, Tao XM. Fiber-based wearable electronics: a review of materials, fabrication, devices, and applications. Adv Mater. 2014;26(31):5310-5336.

[55] Dong K, Peng X, Wang ZL. Fiber/fabric-based piezoelectric and triboelectric nanogenerators for flexible/stretchable and wearable electronics and artificial intelligence. Adv Mater. 2020;32(5):1902549.

[56] Jiang J, Tu S, Fu R, et al. Flexible piezoelectric pressure tactile sensor based on electrospun BaTiO₃/poly (vinylidene fluoride) nanocomposite membrane. ACS Appl Mater Interfaces. 2020;12(30):33989-33998.

[57] Cheng Y, Zhu W, Lu X, Wang C. Mechanically robust, stretchable, autonomously adhesive, and environmentally tolerant triboelectric electronic skin for self-powered healthcare monitoring and tactile sensing. Nano Energy. 2022;102:107636.

[58] Zhang H, Chen Y, Xiao J, Song F, Wang C, Wang H. Fabrication of enhanced dielectric PVDF nanocomposite based on the conjugated synergistic effect of ionic liquid and graphene. Mater Today: Proc. 2019;16:1512-1517.

[59] Lu L, Yang B, Zhai Y, Liu J. Electrospinning core-sheath piezoelectric microfibers for self-powered stitchable sensor. Nano Energy. 2020;76:104966.

[60] Su Y, Li W, Cheng X, et al. High-performance piezoelectric composites via β phase programming. Nat Commun. 2022;13(1):4867.

[61] Jiang Y, Dong K, Li X, et al. Stretchable, washable, and ultrathin triboelectric nanogenerators as skin-like highly sensitive self-powered haptic sensors. Adv Funct Mater. 2021;31(1):2005584.

[62] Park Y, Shin YE, Park J, et al. Ferroelectric multilayer nanocomposites with polarization and stress concentration structures for enhanced triboelectric performances. ACS Nano. 2020;14(6):7101-7110.

[63] Xi B, Wang L, Yang B, Xia Y, Chen D, Wang X. Boosting output performance of triboelectric nanogenerator based on BaTiO₃: La embedded nanofiber membrane for energy harvesting and wireless power transmission. Nano Energy. 2023;110:108385.

[64] Ding S, Ouyang X, Li Z, Yang H. Proportion-based fuzzy gait phase detection using the smart insole. Sens Actuator A Phy. 2018;284:96-102.

[65] Ding S, Ouyang X, Liu T, Li Z, Yang H. Gait event detection of a lower extremity exoskeleton robot by an intelligent IMU. IEEE Sens J. 2018;18(23):9728-9735.

[66] Yang X, Liu G, Guo Q, et al. Triboelectric sensor array for internet of things based smart traffic monitoring and management system. Nano Energy. 2022;92:106757.

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