An Integrated Bifunctional Pressure‒Temperature Sensing System Fabricated on a Breathable Nanofiber and Powered by Rechargeable Zinc–Air Battery for Long-Term Comfortable Health Care Monitoring

Abstract

Bulky external power supplies largely limit the continuous long-term application and miniaturization development of smart sensing devices. Here, we fabricate a flexible and wearable integrated sensing system on an electrospun all-nanofiber platform. The three parts of the sensing system are all obtained by a facile ink-based direct writing method. The resistive pressure sensor is realized by decorating MXene sheets on TPU nanofiber. And, the resistive temperature sensor is prepared by compositing MXene sheets into poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). The thin-film zinc–air battery (ZAB) includes an interdigital zinc–air electrode that is bonded with a gel polymer electrolyte. It can supply a high open-circuit voltage of 1.39 V and a large areal capacity of 18.2 mAh cm⁻² for stable and reliable power-supplying sensing parts operation. Thanks to the hydrophobic nature of TPU and open-ended micropores in the TPU nanofiber, the sensing system is waterproof, self-cleaning, and air and moisture permeable. For application, the above-mentioned functional components are seamlessly integrated into an intelligent electronic wristband, which is comfortably worn on a human wrist to monitor pulse and body temperature in real time with continuous operation of up to 4 h. By the novel design and remarkable performance, the proposed integrated all-nanofiber sensing system presents a promising solution for developing advanced multifunctional wearable electronics.

We developed an integrated sensing system on a flexible and breathable thermoplastic polyurethane nanofiber platform. The sensing system is realized by a direct write technology and includes a pressure sensor, temperature sensor, and rechargeable zinc–air battery. The integrated sensing system was designed for wristbands and demonstrated to accurately detect pulse beating and skin temperature under different states for up to 4 hours of wearing.

Keywords

Pressure‒temperature sensor / Rechargeable zinc–air battery / Electrospun nanofibers / Permeable electronic / Integrated sensing system

References

[1] Bae GY, Pak SW, Kim D, Lee G, Kim DH, Chung Y, Cho K. Linearly and highly pressure-sensitive electronic skin based on a bioinspired hierarchical structural array. Adv Mater, 2016, 28: 5300-5306,

[2] Li Z, Zhu M, Shen J, Qiu Q, Yu J, Ding B. All-fiber structured electronic skin with high elasticity and breathability. Adv Funct Mater, 2020, 30: 1908411,

[3] Cao Y, Tan YJ, Li S, Lee WW, Guo H, Cai Y, Wang C, Tee BCK. Self-healing electronic skins for aquatic environments. Nat Electron, 2019, 2: 75-82,

[4] Sun G, Wang P, Jiang Y, Sun H, Liu T, Li G, Yu W, Meng C, Guo S. Bioinspired flexible, breathable, waterproof and self-cleaning iontronic tactile sensors for special underwater sensing applications. Nano Energy, 2023, 110,

[5] Wang P, Li G, Liu J, Hou Z, Meng C, Guo S. Flexible, freestanding, ultrasensitive, and iontronic tactile sensing textile. ACS Appl Electron Mater, 2021, 3: 2195-2202,

[6] Libanori A, Chen G, Zhao X, Zhou Y, Chen J. Smart textiles for personalized healthcare. Nat Electro, 2022, 5: 142-156,

[7] Wang Y, Jin J, Lu Y, Mei D. 3D printing of liquid metal based tactile sensor for simultaneously sensing of temperature and forces. Int J Smart Nano Mater, 2021, 12: 269-285,

[8] Yan T, Wu Y, Tang J, Pan Z. Flexible strain sensors fabricated using aligned carbon nanofiber membranes with cross-stacked structure for extensive applications. Int J Smart Nano Mater, 2022, 13: 432-446,

[9] Min J, Demchyshyn S, Sempionatto JR, Song Y, Hailegnaw B, Xu C, Yang Y, Solomon S, Putz C, Lehner LE, Schwarz JF, Schwarzinger C, Scharber MC, Shirzaei Sani E, Kaltenbrunner M, Gao W. An autonomous wearable biosensor powered by a perovskite solar cell. Nat. Electron. 2023; 6: 630–41.

[10] Zhang Y, Chen C, Qiu Y, Ma L, Qiu W, Yu R, Yu W, Liu XY. Meso-reconstruction of silk fibroin based on molecular and nano-templates for electronic skin in medical applications. Adv Funct Mater, 2021, 31: 2100150,

[11] Lei D, Zhang Q, Liu N, Su T, Wang L, Ren Z, Zhang Z, Su J, Gao Y. Self-powered graphene oxide humidity sensor based on potentiometric humidity transduction mechanism. Adv Funct Mater, 2022, 32: 2107330,

[12] Li X, Fan YJ, Li HY, Cao JW, Xiao YC, Wang Y, Liang F, Wang HL, Jiang Y, Wang ZL, Zhu G. Ultracomfortable hierarchical nanonetwork for highly sensitive pressure sensor. ACS Nano, 2020, 14: 9605-9612,

[13] Cao M, Su J, Fan S, Qiu H, Su D, Li L. Wearable piezoresistive pressure sensors based on 3D graphene. Chem Eng J, 2021, 406,

[14] Yan J, Ma Y, Li X, Zhang C, Cao M, Chen W, Luo S, Zhu M, Gao Y. Flexible and high-sensitivity piezoresistive sensor based on MXene composite with wrinkle structure. Ceram Int, 2020, 46: 23592-23598,

[15] Zhang W, Xiao Y, Duan Y, Li N, Wu L, Lou Y, Wang H, Peng Z. A high-performance flexible pressure sensor realized by overhanging cobweb-like structure on a micropost array. ACS Appl Mater Inter, 2020, 12: 48938-48947,

[16] Yin R, Li L, Wang L, Lou Z. Self-healing Au/PVDF-HFP composite ionic gel for flexible underwater pressure sensor. J Semicond, 2023, 44: 032602,

[17] Shi Y, Zhang Z, Huang Q, Lin Y, Zheng Z. Wearable sweat biosensors on textiles for health monitoring. J Semicond, 2023, 44: 021601,

[18] Lee J, Kwon H, Seo J, Shin S, Koo JH, Pang C, Son S, Kim JH, Jang YH, Kim DE, Lee T. Conductive fiber-based ultrasensitive textile pressure sensor for wearable electronics. Adv Mater, 2015, 27: 2433-2439,

[19] Durukan MB, Cicek MO, Doganay D, Gorur MC, Çınar S, Unalan HE. Multifunctional and physically transient supercapacitors, triboelectric nanogenerators, and capacitive sensors. Adv Funct Mater, 2022, 32: 2106066,

[20] Lv C, Tian C, Jiang J, Dang Y, Liu Y, Duan X, Li Q, Chen X, Xie M. Ultrasensitive linear capacitive pressure sensor with wrinkled microstructures for tactile perception. Adv Sci, 2023, 10: 2206807,

[21] Kim N-I, Chen J, Wang W, Moradnia M, Pouladi S, Kwon M-K, Kim J-Y, Li X, Ryou J-H. Highly-sensitive skin-attachable eye-movement sensor using flexible nonhazardous piezoelectric thin film. Adv Funct Mater, 2021, 31: 2008242,

[22] Chorsi MT, Curry EJ, Chorsi HT, Das R, Baroody J, Purohit PK, Ilies H, Nguyen TD. Piezoelectric biomaterials for sensors and actuators. Adv Mater, 2019, 31: 1802084,

[23] Maurya D, Khaleghian S, Sriramdas R, Kumar P, Kishore RA, Kang MG, Kumar V, Song H-C, Lee S-Y, Yan Y, Park J-M, Taheri S, Priya S. 3D printed graphene-based self-powered strain sensors for smart tires in autonomous vehicles. Nat Comm, 2020, 11: 5392,

[24] Lu D, Liu T, Meng X, Luo B, Yuan J, Liu Y, Zhang S, Cai C, Gao C, Wang J, Wang S, Nie S. Wearable triboelectric visual sensors for tactile perception. Adv Mater, 2023, 35: 2209117,

[25] Niu F, Qin Z, Min L, Zhao B, Lv Y, Fang X, Pan K. Ultralight and hyperelastic nanofiber-reinforced MXene–graphene aerogel for high-performance piezoresistive sensor. Adv Mater Technol-us, 2021, 6: 2100394,

[26] Yang Z, Li H, Zhang S, Lai X, Zeng X. Superhydrophobic MXene@carboxylated carbon nanotubes/carboxymethyl chitosan aerogel for piezoresistive pressure sensor. Chem Eng J, 2021, 425,

[27] Wang C, Xia K, Wang H, Liang X, Yin Z, Zhang Y. Advanced carbon for flexible and wearable electronics. Adv Mater, 2019, 31: 1801072,

[28] Li J, Yin J, Wee MGV, Chinnappan A, Ramakrishna S. A self-powered piezoelectric nanofibrous membrane as wearable tactile sensor for human body motion monitoring and recognition. Adv Fiber Mater, 2023, 5: 1417-1430,

[29] Ma J, Cui Z, Du Y, Zhang J, Sun C, Hou C, Zhu N. Wearable fiber-based supercapacitors enabled by additive-free aqueous MXene inks for self-powering healthcare sensors. Adv Fiber Mater, 2022, 4: 1535-1544,

[30] Liu S, Zhang W, He J, Lu Y, Wu Q, Xing M. Fabrication techniques and sensing mechanisms of textile-based strain sensors: from spatial 1D and 2D perspectives. Adv. Fiber Mater. 2024; 6: 36–67.

[31] Liu Z, Zhu T, Wang J, Zheng Z, Li Y, Li J, Lai Y. Functionalized fiber-based strain sensors: pathway to next-generation wearable electronics. Nano-Micro Lett, 2022, 14: 61,

[32] Salvo P, Calisi N, Melai B, Cortigiani B, Mannini M, Caneschi A, Lorenzetti G, Paoletti C, Lomonaco T, Paolicchi A, Scataglini I, Dini V, Romanelli M, Fuoco R, Di Francesco F. Temperature and pH sensors based on graphenic materials. Biosens Bioelectron, 2017, 91: 870-877,

[33] Gu Y, Hao J, Wu T, Zhang Z, Zhang Z, Li Q. Bimetallic MoNi/WNi nanoalloys for ultra-sensitive wearable temperature sensors. J Mater Chem A, 2022, 10: 5402-5409,

[34] Daus A, Jaikissoon M, Khan AI, Kumar A, Grady RW, Saraswat KC, Pop E. Fast-response flexible temperature sensors with atomically thin molybdenum disulfide. Nano Lett, 2022, 22: 6135-6140,

[35] Taroni PJ, Santagiuliana G, Wan K, Calado P, Qiu M, Zhang H, Pugno NM, Palma M, Stingelin-Stutzman N, Heeney M, Fenwick O, Baxendale M, Bilotti E. Toward stretchable self-powered sensors based on the thermoelectric response of PEDOT:PSS/Polyurethane blends. Adv Funct Mater, 2018, 28: 1704285,

[36] Cao Z, Yang Y, Zheng Y, Wu W, Xu F, Wang R, Sun J. Highly flexible and sensitive temperature sensors based on Ti3C2Tx (MXene) for electronic skin. J Mater Chem A, 2019, 7: 25314-25323,

[37] Lin Y, Chen J, Tavakoli MM, Gao Y, Zhu Y, Zhang D, Kam M, He Z, Fan Z. Printable fabrication of a fully integrated and self-powered sensor system on plastic substrates. Adv Mater, 2019, 31: 1804285,

[38] Zhang Q, Lei D, Liu N, Liu Z, Ren Z, Yin J, Jia P, Lu W, Gao Y. A zinc-ion battery-type self-powered pressure sensor with long service life. Adv Mater, 2022, 34: 2205369,

[39] Park H, Song C, Jin SW, Lee H, Keum K, Lee YH, Lee G, Jeong YR, Ha JS. High performance flexible micro-supercapacitor for powering a vertically integrated skin-attachable strain sensor on a bio-inspired adhesive. Nano Energy, 2021, 83,

[40] Song Y, Chen H, Chen X, Wu H, Guo H, Cheng X, Meng B, Zhang H. All-in-one piezoresistive-sensing patch integrated with micro-supercapacitor. Nano Energy, 2018, 53: 189-197,

[41] Chen X, Hou Z, Li G, Yu W, Xue Y, Niu G, Xin M, Yang L, Meng C, Guo S. A laser-scribed wearable strain sensing system powered by an integrated rechargeable thin-film zinc–air battery for a long-time continuous healthcare monitoring. Nano Energy, 2022, 101,

[42] Yu Y, Nassar J, Xu C, Min J, Yang Y, Dai A, Doshi R, Huang A, Song Y, Gehlhar R, Ames AD, Gao W. Biofuel-powered soft electronic skin with multiplexed and wireless sensing for human-machine interfaces. Sci Robot, 2020, 5: eaaz7946,

[43] Song Y, Min J, Yu Y, Wang H, Yang Y, Zhang H, Gao W. Wireless battery-free wearable sweat sensor powered by human motion. Sci Adv, 2020, 6: eaay9842,

[44] Meng K, Zhao S, Zhou Y, Wu Y, Zhang S, He Q, Wang X, Zhou Z, Fan W, Tan X, Yang J, Chen J. A wireless textile-based sensor system for self-powered personalized health care. Matter, 2020, 2: 896-907,

[45] Xu F, Dong S, Liu G, Pan C, Guo ZH, Guo W, Li L, Liu Y, Zhang C, Pu X, Wang ZL. Scalable fabrication of stretchable and washable textile triboelectric nanogenerators as constant power sources for wearable electronics. Nano Energy, 2021, 88,

[46] Yin L, Kim KN, Lv J, Tehrani F, Lin M, Lin Z, Moon J-M, Ma J, Yu J, Xu S, Wang J. A self-sustainable wearable multi-modular E-textile bioenergy microgrid system. Nat Commun, 2021, 12: 1542,

[47] Manthiram A. A reflection on lithium-ion battery cathode chemistry. Nat Comm, 2020, 11: 1550,

[48] Kim T, Song W, Son D-Y, Ono LK, Qi Y. Lithium-ion batteries: outlook on present, future, and hybridized technologies. J Mater Chem A, 2019, 7: 2942-2964,

[49] Liu S, Ji H, Wang M, Sun H, Liu J, Yan C, Qian T. Atomic metal vacancy modulation of single-atom dispersed Co/N/C for highly efficient and stable air cathode. ACS Appl Mater Inter, 2020, 12: 15298-15304,

[50] Hou Z, Zhu B, Li G, Wang P, Meng C, Guo S, Liu C, Fan S. Nanostructured Co3O4 asymmetrically deposited on a single carbon cloth for an all-solid-state integrated hybrid device with reversible zinc–air high-energy conversion and asymmetric supercapacitive high-power delivery. Energ Fuel, 2021, 35: 12706-12717,

[51] Fang W, Zhao J, Zhang W, Chen P, Bai Z, Wu M. Recent progress and future perspectives of flexible Zn-Air batteries. J Alloy Compd, 2021, 869,

[52] Wang M, Ji H, Liu S, Sun H, Liu J, Yan C, Qian T. Single-atom scale metal vacancy engineering in heteroatom-doped carbon for rechargeable zinc–air battery with reduced overpotential. Chem Eng J, 2020, 393,

[53] Huang Y, Liu B, Zhang W, Qu G, Jin S, Li X, Nie Z, Zhou H. Highly sensitive active-powering pressure sensor enabled by integration of double-rough surface hydrogel and flexible batteries. Npj Flex Electron, 2022, 6: 92,

[54] Sun B, McCay RN, Goswami S, Xu Y, Zhang C, Ling Y, Lin J, Yan Z. Gas-permeable, multifunctional on-skin electronics based on laser-induced porous graphene and sugar-templated elastomer sponges. Chem Eng J, 2018, 30: 1804327

Funding

National Natural Science Foundation of China(62174068); Tianjin Municipal Science and Technology Program(22JCZDJC00630); China National Key Research and Development Program(2022YFC3601400); Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province(JZX2024024); Natural Science Foundation of Shandong Province(ZR2020ME120)