REFERENCES
1. Yeo WH, Kim YS, Lee J, et al. Multifunctional epidermal electronics printed directly onto the skin. Adv Mater 2013;25:2773-8.
2. Jeong JW, Yeo WH, Akhtar A, et al. Materials and optimized designs for human-machine interfaces via epidermal electronics. Adv Mater 2013;25:6839-46.
3. Zhu Z, Li R, Pan T. Imperceptible epidermal-iontronic interface for wearable sensing. Adv Mater 2018;30:1705122.
4. Liu Y, Norton JJ, Qazi R, et al. Epidermal mechano-acoustic sensing electronics for cardiovascular diagnostics and human-machine interfaces. Sci Adv 2016;2:e1601185.
5. Reeder JT, Choi J, Xue Y, et al. Waterproof, electronics-enabled, epidermal microfluidic devices for sweat collection, biomarker analysis, and thermography in aquatic settings. Sci Adv 2019;5:eaau6356.
6. Yu X, Xie Z, Yu Y, et al. Skin-integrated wireless haptic interfaces for virtual and augmented reality. Nature 2019;575:473-9.
7. Yeo JC, Lim CT. Emerging flexible and wearable physical sensing platforms for healthcare and biomedical applications. Microsyst Nanoeng 2016;2:16043.
8. Liu Y, Zhao L, Avila R, et al. Epidermal electronics for respiration monitoring via thermo-sensitive measuring. Materials Today Physics 2020;13:100199.
9. Kim CH, Lee DH, Youn J, Lee H, Jeong J. Simple and cost-effective microfabrication of flexible and stretchable electronics for wearable multi-functional electrophysiological monitoring. Sci Rep 2021;11:14823.
10. Guo J, Yu Y, Zhang D, Zhang H, Zhao Y. Morphological hydrogel microfibers with MXene encapsulation for electronic skin. Research (Wash D C) 2021;2021:7065907.
11. Liu Y, Zhao L, Wang L, et al. Skin-integrated graphene-embedded lead zirconate titanate rubber for energy harvesting and mechanical sensing. Adv Mater Technol 2019;4:1900744.
12. Tzou H, Tseng C. Distributed piezoelectric sensor/actuator design for dynamic measurement/control of distributed parameter systems: a piezoelectric finite element approach. J Sound Vib 1990;138:17-34.
13. Ng TH, Liao WH. Sensitivity analysis and energy harvesting for a self-powered piezoelectric sensor. J Intell Mater Syst Struct 2005;16:785-97.
14. Liu Y, Zheng H, Zhao L, et al. Electronic skin from high-throughput fabrication of intrinsically stretchable lead zirconate titanate elastomer. Research (Wash D C) 2020;2020:1085417.
15. Wang X, Zhang H, Dong L, et al. Self-powered high-resolution and pressure-sensitive triboelectric sensor matrix for real-time tactile mapping. Adv Mater 2016;28:2896-903.
16. 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.
17. Wu M, Gao Z, Yao K, et al. Thin, soft, skin-integrated foam-based triboelectric nanogenerators for tactile sensing and energy harvesting. Materials Today Energy 2021;20:100657.
18. Yiu C, Wong TH, Liu Y, et al. Skin-like strain sensors enabled by elastomer composites for human-machine interfaces. Coatings 2020;10:711.
19. Yan C, Wang J, Kang W, et al. Highly stretchable piezoresistive graphene-nanocellulose nanopaper for strain sensors. Adv Mater 2014;26:2022-7.
20. Pacelli M, Caldani L, Paradiso R. Textile piezoresistive sensors for biomechanical variables monitoring. Conf Proc IEEE Eng Med Biol Soc 2006;2006:5358-61.
21. Hu N, Fukunaga H, Atobe S, Liu Y, Li J. Piezoresistive strain sensors made from carbon nanotubes based polymer nanocomposites. Sensors (Basel) 2011;11:10691-723.
22. Zhu J, Zhou C, Zhang M. Recent progress in flexible tactile sensor systems: from design to application. Soft Sci 2021;1:3.
23. Liu Y, Wang L, Zhao L, Yu X, Zi Y. Recent progress on flexible nanogenerators toward self-powered systems. InfoMat 2020;2:318-40.
24. Wang L, Liu Y, Liu Q, et al. A metal-electrode-free, fully integrated, soft triboelectric sensor array for self-powered tactile sensing. Microsyst Nanoeng 2020;6:59.
25. Zhou Y, He J, Wang H, et al. Highly sensitive, self-powered and wearable electronic skin based on pressure-sensitive nanofiber woven fabric sensor. Sci Rep 2017;7:12949.
26. Lou Z, Li, Wang L, Shen G. Recent progress of self-powered sensing systems for wearable electronics. Small 2017;13:1701791.
27. Wang Y, Wang Y, Yang Y. Graphene-polymer nanocomposite-based redox-induced electricity for flexible self-powered strain sensors. Adv Energy Mater 2018;8:1800961.
28. Lu Y, Biswas MC, Guo Z, Jeon JW, Wujcik EK. Recent developments in bio-monitoring via advanced polymer nanocomposite-based wearable strain sensors. Biosens Bioelectron 2019;123:167-77.
29. Wang X, Zhang Y, Zhang X, et al. A highly stretchable transparent self-powered triboelectric tactile sensor with metallized nanofibers for wearable electronics. Adv Mater 2018;30:e1706738.
30. Zhao G, Zhang Y, Shi N, et al. Transparent and stretchable triboelectric nanogenerator for self-powered tactile sensing. Nano Energy 2019;59:302-10.
31. Yang M, Liu J, Liu D, et al. A Fully Self-healing piezoelectric nanogenerator for self-powered pressure sensing electronic skin. Research (Wash D C) 2021;2021:9793458.
32. Shu YC, Lien IC. Analysis of power output for piezoelectric energy harvesting systems. Smart Mater Struct 2006;15:1499-512.
33. Feng W, Zheng W, Gao F, et al. Sensitive electronic-skin strain sensor array based on the patterned two-dimensional α-In2Se3. Chem Mater 2016;28:4278-83.
34. Park J, Lee Y, Hong J, et al. Tactile-direction-sensitive and stretchable electronic skins based on human-skin-inspired interlocked microstructures. ACS Nano 2014;8:12020-9.
35. Lipomi DJ, Vosgueritchian M, Tee BC, et al. Skin-like pressure and strain sensors based on transparent elastic films of carbon nanotubes. Nat Nanotechnol 2011;6:788-92.
36. Cheng Y, Wang R, Zhai H, Sun J. Stretchable electronic skin based on silver nanowire composite fiber electrodes for sensing pressure, proximity, and multidirectional strain. Nanoscale 2017;9:3834-42.
37. Kanao K, Harada S, Yamamoto Y, et al. Highly selective flexible tactile strain and temperature sensors against substrate bending for an artificial skin. RSC Adv 2015;5:30170-4.
38. Gong S, Lai DTH, Su B, et al. Highly stretchy black gold e-skin nanopatches as highly sensitive wearable biomedical sensors. Adv Electron Mater 2015;1:1400063.
39. Luo N, Huang Y, Liu J, Chen SC, Wong CP, Zhao N. Hollow-structured graphene-silicone-composite-based piezoresistive sensors: decoupled property tuning and bending reliability. Adv Mater 2017;29:1702675.
40. Chen H, Miao L, Su Z, et al. Fingertip-inspired electronic skin based on triboelectric sliding sensing and porous piezoresistive pressure detection. Nano Energy 2017;40:65-72.
41. Niu D, Jiang W, Ye G, et al. Graphene-elastomer nanocomposites based flexible piezoresistive sensors for strain and pressure detection. Materials Research Bulletin 2018;102:92-9.
42. Canavese G, Lombardi M, Stassi S, Pirri CF. Comprehensive characterization of large piezoresistive variation of Ni-PDMS composites. AMM 2011;110-116:1336-44.
43. Cai G, Wang J, Qian K, Chen J, Li S, Lee PS. Extremely stretchable strain sensors based on conductive self-healing dynamic cross-links hydrogels for human-motion detection. Adv Sci (Weinh) 2017;4:1600190.
44. Jing X, Mi H, Peng X, Turng L. Biocompatible, self-healing, highly stretchable polyacrylic acid/reduced graphene oxide nanocomposite hydrogel sensors via mussel-inspired chemistry. Carbon 2018;136:63-72.
45. Liu S, Li L. Ultrastretchable and self-healing double-network hydrogel for 3D printing and strain sensor. ACS Appl Mater Interfaces 2017;9:26429-37.
46. Yin F, Yang J, Peng H, Yuan W. Flexible and highly sensitive artificial electronic skin based on graphene/polyamide interlocking fabric. J Mater Chem C 2018;6:6840-6.
47. Zhao L, Qiang F, Dai SW, et al. Construction of sandwich-like porous structure of graphene-coated foam composites for ultrasensitive and flexible pressure sensors. Nanoscale 2019;11:10229-38.
48. Nie P, Wang R, Xu X, et al. High-performance piezoresistive electronic skin with bionic hierarchical microstructure and microcracks. ACS Appl Mater Interfaces 2017;9:14911-9.
49. Hsu MS, Chen YL, Lee CY, Chiu HT. Gold nanostructures on flexible substrates as electrochemical dopamine sensors. ACS Appl Mater Interfaces 2012;4:5570-5.
50. Zhu Y, Moran-mirabal J. Highly bendable and stretchable electrodes based on micro/nanostructured gold films for flexible sensors and electronics. Adv Electron Mater 2016;2:1500345.
51. Li YQ, Huang P, Zhu WB, Fu SY, Hu N, Liao K. Flexible wire-shaped strain sensor from cotton thread for human health and motion detection. Sci Rep 2017;7:45013.
52. Sankar V, Nambi A, Bhat VN, et al. Waterproof flexible polymer-functionalized graphene-based piezoresistive strain sensor for structural health monitoring and wearable devices. ACS Omega 2020;5:12682-91.
53. Wang X, Li J, Song H, Huang H, Gou J. Highly Stretchable And Wearable Strain Sensor Based On Printable Carbon Nanotube Layers/Polydimethylsiloxane Composites With Adjustable Sensitivity. ACS Appl Mater Interfaces 2018;10:7371-80.
54. Zheng Y, Li Y, Zhou Y, et al. High-performance wearable strain sensor based on graphene/cotton fabric with high durability and low detection limit. ACS Appl Mater Interfaces 2020;12:1474-85.
55. Zheng S, Wu X, Huang Y, et al. Highly sensitive and multifunctional piezoresistive sensor based on polyaniline foam for wearable Human-Activity monitoring. Composites Part A: Applied Science and Manufacturing 2019;121:510-6.