REFERENCES
1. Li, Y.; Wang, Y.; Wang, X.; et al. Linear range enhancement in flexible piezoresistive sensors enabled by double-layer corrugated structure. Adv. Funct. Mater. 2025, e13480.
2. Gao, L.; Zhu, C.; Li, L.; et al. All paper-based flexible and wearable piezoresistive pressure sensor. ACS. Appl. Mater. Interfaces. 2019, 11, 25034-42.
3. Li, Y.; Wang, X.; Wang, Y.; et al. Ultrawide sensing range and high-sensitivity capacitive pressure sensor based on skeleton dilution strategies for human motion and correction of poor body posture. IEEE. Sensors. J. 2024, 24, 11270-8.
4. Han, R.; Liu, Y.; Mo, Y.; et al. High anti-jamming flexible capacitive pressure sensors based on core-shell structured AgNWs@TiO2. Adv. Funct. Mater. 2023, 33, 2305531.
5. Cheng, T.; Shao, J.; Wang, Z. L. Triboelectric nanogenerators. Nat. Rev. Methods. Primers. 2023, 3, 39.
6. Niu, S.; Wang, Z. L. Theoretical systems of triboelectric nanogenerators. Nano. Energy. 2015, 14, 161-92.
7. Chen, Z.; Wang, Z.; Li, X.; et al. Flexible piezoelectric-induced pressure sensors for static measurements based on nanowires/graphene heterostructures. ACS. Nano. 2017, 11, 4507-13.
8. Jung, Y. H.; Hong, S. K.; Wang, H. S.; et al. Flexible piezoelectric acoustic sensors and machine learning for speech processing. Adv. Mater. 2020, 32, e1904020.
9. Qiu, Z.; Wan, Y.; Zhou, W.; et al. Ionic skin with biomimetic dielectric layer templated from Calathea Zebrine leaf. Adv. Funct. Mater. 2018, 28, 1802343.
10. Bai, N.; Wang, L.; Wang, Q.; et al. Graded intrafillable architecture-based iontronic pressure sensor with ultra-broad-range high sensitivity. Nat. Commun. 2020, 11, 209.
11. Zhao, C.; Wang, Y.; Tang, G.; et al. Ionic flexible sensors: mechanisms, materials, structures, and applications. Adv. Funct. Mater. 2022, 32, 2110417.
12. Huang, Y.; Fan, X.; Chen, S. C.; Zhao, N. Emerging technologies of flexible pressure sensors: materials, modeling, devices, and manufacturing. Adv. Funct. Mater. 2019, 29, 1808509.
13. Mishra, R. B.; El‐atab, N.; Hussain, A. M.; Hussain, M. M. Recent progress on flexible capacitive pressure sensors: from design and materials to applications. Adv. Mater. Technol. 2021, 6, 2001023.
14. Wang, J.; Chen, Y.; Tu, S.; Cui, X.; Chen, J.; Zhu, Y. Recent advances in flexible iontronic pressure sensors: materials, microstructure designs, applications, and opportunities. J. Mater. Chem. C. 2024, 12, 14202-21.
15. Li, Y.; Bai, N.; Chang, Y.; et al. Flexible iontronic sensing. Chem. Soc. Rev. 2025, 54, 4651-700.
16. Nie, B.; Xing, S.; Brandt, J. D.; Pan, T. Droplet-based interfacial capacitive sensing. Lab. Chip. 2012, 12, 1110-8.
17. Zhuo, F.; Ding, Z.; Yang, X.; et al. Advanced morphological and material engineering for high-performance interfacial iontronic pressure sensors. Adv. Sci. (Weinh). 2025, 12, e2413141.
18. Shi, J.; Dai, Y.; Cheng, Y.; et al. Embedment of sensing elements for robust, highly sensitive, and cross-talk-free iontronic skins for robotics applications. Sci. Adv. 2023, 9, eadf8831.
19. Bai, N.; Wang, L.; Xue, Y.; et al. Graded interlocks for iontronic pressure sensors with high sensitivity and high linearity over a broad range. ACS. Nano. 2022, 16, 4338-47.
20. Zhang, Y.; Yang, J.; Hou, X.; et al. Highly stable flexible pressure sensors with a quasi-homogeneous composition and interlinked interfaces. Nat. Commun. 2022, 13, 1317.
21. Wang, J.; Wei, X.; Shi, J.; et al. High-resolution flexible iontronic skins for both negative and positive pressure measurement in room temperature wind tunnel applications. Nat. Commun. 2024, 15, 7094.
22. Lu, P.; Wang, L.; Zhu, P.; et al. Iontronic pressure sensor with high sensitivity and linear response over a wide pressure range based on soft micropillared electrodes. Sci. Bull. (Beijing). 2021, 66, 1091-100.
23. Bai, N.; Xue, Y.; Chen, S.; et al. A robotic sensory system with high spatiotemporal resolution for texture recognition. Nat. Commun. 2023, 14, 7121.
24. Guo, H.; Bai, M.; Wen, C.; et al. A zwitterionic-aromatic motif-based ionic skin for highly biocompatible and glucose-responsive sensor. J. Colloid. Interface. Sci. 2021, 600, 561-71.
25. He, Y.; Cheng, Y.; Yang, C.; Guo, C. F. Creep-free polyelectrolyte elastomer for drift-free iontronic sensing. Nat. Mater. 2024, 23, 1107-14.
26. Wang, H. L.; Chen, T.; Zhang, B.; et al. A dual-responsive artificial skin for tactile and touchless interfaces. Small 2023, 19, e2206830.
27. Li, Q.; Liu, Z.; Zheng, S.; et al. Three-dimensional printable, highly conductive ionic elastomers for high-sensitivity iontronics. ACS. Appl. Mater. Interfaces. 2022, 14, 26068-76.
28. Chang, Y.; Wang, L.; Li, R.; et al. First decade of interfacial iontronic sensing: from droplet sensors to artificial skins. Adv. Mater. 2021, 33, e2003464.
29. Zhao, Y.; Wang, T.; Zhao, Z.; Wang, Q. Track-etch membranes as tools for template synthesis of highly sensitive pressure sensors. ACS. Appl. Mater. Interfaces. 2022, 14, 1791-9.
30. Yang, Z.; Wang, J.; Wan, X.; et al. Microbubble-based fabrication of resilient porous ionogels for high-sensitivity pressure sensors. Microsyst. Nanoeng. 2024, 10, 177.
31. Choi, K.; Lee, G.; Lee, M. G.; Hwang, H. J.; Lee, K.; Lee, Y. Bio-inspired ionic sensors: transforming natural mechanisms into sensory technologies. Nanomicro. Lett. 2025, 17, 180.
32. Ro, Y. G.; Na, S.; Kim, J.; et al. Iontronics: Neuromorphic sensing and energy harvesting. ACS. Nano. 2025, 19, 24425-507.
33. Lee, G.; Lee, D.; Im, G. B.; Lee, Y. A review on soft ionic touch point sensors. Energy. &. Environ. Mater. 2024, 7, e12794.
34. Zhao, Y.; Yang, N.; Chu, X.; et al. Wide-humidity range applicable, anti-freezing, and healable zwitterionic hydrogels for ion-leakage-free iontronic sensors. Adv. Mater. 2023, 35, e2211617.
35. Chang, K.; Zhang, C.; Liu, T. A comprehensive review on fabrication and structural design of polymer composites for wearable pressure sensors. Polym. Sci. Technol. 2025, 1, 3-24.
36. Gao, N.; Pan, C. Intelligent ion gels: design, performance, and applications. SmartMat 2023, 5, e1215.
37. Chen, Z.; Wang, Y. Ionic skin: from imitating natural skin to beyond. Ind. Chem. Mater. 2023, 1, 224-39.
38. Huang, F.; Sun, X.; Shi, Y.; Pan, L. Flexible ionic-gel synapse devices and their applications in neuromorphic system. FlexMat 2024, 2, 30-54.
39. Gao, J.; Zeb, A.; Li, H.; et al. Poly(ionic liquid)s-based ionogels for sensor applications. ACS. Appl. Polym. Mater. 2024, 6, 14260-72.
40. Wen, J.; Zhou, L.; Ye, T. Polymer ionogels and their application in flexible ionic devices. SmartMat 2024, 5, e1253.
41. Choi, S. G.; Kang, S. H.; Lee, J. Y.; Park, J. H.; Kang, S. K. Recent advances in wearable iontronic sensors for healthcare applications. Front. Bioeng. Biotechnol. 2023, 11, 1335188.
42. Li, R.; Zhou, Q.; Bi, Y.; et al. Research progress of flexible capacitive pressure sensor for sensitivity enhancement approaches. Sens. Actuat. A-Phys. 2021, 321, 112425.
43. GRAHAME, D. C. The electrical double layer and the theory of electrocapillarity. Chem. Rev. 1947, 41, 441-501.
44. Li, C.; Cheng, J.; He, Y.; et al. Polyelectrolyte elastomer-based ionotronic sensors with multi-mode sensing capabilities via multi-material 3D printing. Nat. Commun. 2023, 14, 4853.
45. Choi, N. S.; Chen, Z.; Freunberger, S. A.; et al. Challenges facing lithium batteries and electrical double-layer capacitors. Angew. Chem. Int. Ed. Engl. 2012, 51, 9994-10024.
46. Gouy, M. Sur la constitution de la charge électrique à la surface d'un électrolyte. J. Phys. Theor. Appl. 1910, 9, 457-68.
47. Chapman, D. L. LI.A contribution to the theory of electrocapillarity. Lond. Edinb. Dubl. Philos. Mag. J. Sci. 2010, 25, 475-81.
48. Parsons, R. The electrical double layer: recent experimental and theoretical developments. Chem. Rev. 2002, 90, 813-26.
49. Torrie, G. M.; Valleau, J. P. Electrical double layers. I. Monte Carlo study of a uniformly charged surface. J. Chem. Phys. 1980, 73, 5807-16.
50. Carnie, S. L.; Chan, D. Y. C. The statistical mechanics of the electrical double layer: Stress tensor and contact conditions. J. Chem. Phys. 1981, 74, 1293-7.
51. Heikenfeld, J.; Jajack, A.; Rogers, J.; et al. Wearable sensors: modalities, challenges, and prospects. Lab. Chip. 2018, 18, 217-48.
52. Zhang, Y.; Rajamani, R.; Sezen, S. Novel supercapacitor-based force sensor insensitive to parasitic noise. IEEE. Sens. Lett. 2017, 1.
53. Greenwood, J. A.; Williamson, J. B. P. Contact of nominally flat surfaces. Proc. R. Soc. Lond. A. Math. Phys. Sci. 1966, 295, 300-19.
55. Mannsfeld, S. C.; Tee, B. C.; Stoltenberg, R. M.; et al. Highly sensitive flexible pressure sensors with microstructured rubber dielectric layers. Nat. Mater. 2010, 9, 859-64.
56. Nie, B.; Li, R.; Brandt, J. D.; Pan, T. Iontronic microdroplet array for flexible ultrasensitive tactile sensing. Lab. Chip. 2014, 14, 1107-16.
57. Wang, X.; Li, Y.; Wang, Y.; et al. Fabrication method and various application scenarios of flexible capacitive pressure sensor based on direct formation of conical structure. Chem. Eng. J. 2024, 496, 153957.
58. Tang, Y.; Wang, P.; Li, G.; et al. Flexible and ultra-sensitive planar supercapacitive pressure sensor based on porous ionic foam. Adv. Eng. Mater. 2022, 25, 2200814.
59. Liu, Q.; Liu, Y.; Shi, J.; Liu, Z.; Wang, Q.; Guo, C. F. High-porosity foam-based iontronic pressure sensor with superhigh sensitivity of 9280 kPa-1. Nanomicro. Lett. 2021, 14, 21.
60. Xu, R.; She, M.; Liu, J.; et al. Breathable kirigami-shaped ionotronic e-textile with touch/strain sensing for friendly epidermal electronics. Adv. Fiber. Mater. 2022, 4, 1525-34.
61. Wang, Z.; Si, Y.; Zhao, C.; Yu, D.; Wang, W.; Sun, G. Flexible and washable poly(ionic liquid) nanofibrous membrane with moisture proof pressure sensing for real-life wearable electronics. ACS. Appl. Mater. Interfaces. 2019, 11, 27200-9.
62. Gou, X.; Yang, J.; Li, P.; et al. Biomimetic nanofiber-iongel composites for flexible pressure sensors with broad range and ultra-high sensitivity. Nano. Energy. 2024, 120, 109140.
63. Niu, H.; Li, H.; Zhang, Q.; Kim, E. S.; Kim, N. Y.; Li, Y. Intuition-and-tactile bimodal sensing based on artificial-intelligence-motivated all-fabric bionic electronic skin for intelligent material perception. Small 2024, 20, e2308127.
64. Zhang, J.; Wang, H.; Tian, W.; Li, D.; Zhang, J.; Song, Y. Compressive sponge electrodes enabled highly sensitive hybrid-iontronic pressure sensor. ACS. Appl. Mater. Interfaces. 2025, 17, 38635-47.
65. Luo, Y.; Chen, X.; Tian, H.; et al. Gecko-inspired slant hierarchical microstructure-based ultrasensitive iontronic pressure sensor for intelligent interaction. Research. (Wash. D. C). 2022, 2022, 9852138.
66. Chen, Z.; Zhang, Y.; Zhu, B.; et al. Laser-sculptured hierarchical spinous structures for ultra-high-sensitivity iontronic sensors with a broad operation range. ACS. Appl. Mater. Interfaces. 2022, 14, 19672-82.
67. Huang, Y.; Hu, S.; Li, Y.; et al. Programmable high-sensitivity iontronic pressure sensors support broad human-interactive perception and identification. npj. Flex. Electron. 2025, 9, 41.
68. Yuan, Y. M.; Liu, B.; Adibeig, M. R.; et al. Microstructured polyelectrolyte elastomer-based ionotronic sensors with high sensitivities and excellent stability for artificial skins. Adv. Mater. 2024, 36, e2310429.
69. Guo, Y.; Li, H.; Li, Y.; et al. Wearable hybrid device capable of interactive perception with pressure sensing and visualization. Adv. Funct. Mater. 2022, 32, 2203585.
70. Ding, Z.; Li, W.; Wang, W.; et al. Highly sensitive iontronic pressure sensor with side-by-side package based on alveoli and arch structure. Adv. Sci. (Weinh). 2024, 11, e2309407.
71. Qin, Y.; Wang, X.; Gao, B. Ionic Capacitive pressure sensor with enhanced sensitivity and broad detection range featuring hierarchical microridge design. ACS. Appl. Electron. Mater. 2025, 7, 2494-503.
72. Chen, H.; Shi, J.; Ji, C.; Fan, W.; Sui, K. Facile multiple graded wrinkle construction strategy for vastly boosting the sensing performance of ionic skins. ACS. Appl. Mater. Interfaces. 2024, 16, 25462-72.
73. Peng, W.; Zhao, J.; Li, Q.; et al. A strong and tough ion-gel enabled by hierarchical meshing and ion hybridizations collaboration. Adv. Funct. Mater. 2024, 35, 2414682.
74. Lan, R.; Zhang, J.; Chen, J.; et al. High-sensitivity flexible capacitive pressure sensors based on biomimetic hibiscus flower microstructures. ACS. Omega. 2024, 9, 13704-13.
75. Liu, Y.; Wang, J.; Chen, J.; Yuan, Q.; Zhu, Y. Ultrasensitive iontronic pressure sensor based on rose-structured ionogel dielectric layer and compressively porous electrodes. Adv. Compos. Hybrid. Mater. 2023, 6, 210.
76. Burns, D. W. Mems wet-etch processes and procedures. In: Ghodssi, R., Lin, P. Editors. Mems materials and processes handbook, Boston, MA: Springer: 2011; pp 457-665.
77. Pal, P.; Sato, K. Fabrication methods based on wet etching process for the realization of silicon MEMS structures with new shapes. Microsyst. Technol. 2010, 16, 1165-74.
78. Zou, Q.; Lei, Z.; Xue, T.; Li, S.; Ma, Z.; Su, Q. Highly sensitive flexible pressure sensor based on ionic dielectric layer with hierarchical ridge microstructure. Sens. Actuat. A-Phys. 2020, 313, 112218.
79. Chen, Y.; Qin, Y.; Zhang, X.; Zheng, A.; Xia, Q. Hierarchical arete architecture-enabled iontronic pressure sensor with high linearity and sensitivity. Adv. Mater. Technol. 2022, 7, 2200322.
80. Yoon, H.; Ko, S.; Chhetry, A.; et al. Ultra-sensitive and quick-responsive hybrid-supercapacitive iontronic pressure sensor for intuitive electronics and artificial tactile applications. Adv. Mater. Technol. 2022, 7, 2101743.
81. Song, J.; Yang, R.; Shi, J.; et al. Polyelectrolyte-based wireless and drift-free iontronic sensors for orthodontic sensing. Sci. Adv. 2025, 11, eadu6086.
82. Zou, Q.; Li, S.; Xue, T.; Ma, Z.; Lei, Z.; Su, Q. Highly sensitive ionic pressure sensor with broad sensing range based on interlaced ridge-like microstructure. Sens. Actuat. A-Phys. 2020, 313, 112173.
83. Li, G.; Qiu, Z.; Wang, Y.; et al. PEDOT:PSS/Grafted-PDMS electrodes for fully organic and intrinsically stretchable skin-like electronics. ACS. Appl. Mater. Interfaces. 2019, 11, 10373-9.
84. Kwon, J. H.; Kim, Y. M.; Moon, H. C. Porous Ion Gel: A versatile ionotronic sensory platform for high-performance, wearable ionoskins with electrical and optical dual output. ACS. Nano. 2021, 15, 15132-41.
85. Tian, H.; Jiang, Y.; Song, Y.; et al. Hierarchical synergetic strategy for iontronic pressure sensors with high sensitivity and broad linearity range. ACS. Sens. 2025, 10, 2030-7.
86. Sun, G.; Wang, P.; Jiang, Y.; Sun, H.; Meng, C. Intrinsically flexible and breathable supercapacitive pressure sensor based on MXene and ionic gel decorating textiles for comfortable and ultrasensitive wearable healthcare monitoring. ACS. Appl. Electron. Mater. 2022, 4, 1958-67.
87. Hilário, J.; Macucule, B. M.; Wang, P.; Yu, W.; Meng, C. Flexible iontronic tactile sensors based on silver nanowire electrode with sandpaper-roughened surface and ionic liquid gel electrolyte with porous foam structure for wearable sensing applications. ACS. Appl. Electron. Mater. 2024, 6, 4457-66.
88. Li, P.; Zhang, Y.; Zhou, Y.; et al. Epidermis inspired self-assembled iontronic foam with high sensitivity and broad range. Nano. Mater. Sci. 2025, 7, 383-91.
89. Liu, Q.; Liu, Z.; Li, C.; et al. Highly transparent and flexible iontronic pressure sensors based on an opaque to transparent transition. Adv. Sci. (Weinh). 2020, 7, 2000348.
90. Li, B.; Luo, Z.; Gong, L.; et al. Stretchable iontronic tactile sensing fabric. ACS. Appl. Mater. Interfaces. 2024, 16, 42905-16.
91. Sun, G.; Wang, P.; Jiang, Y.; et al. Bioinspired flexible, breathable, waterproof and self-cleaning iontronic tactile sensors for special underwater sensing applications. Nano. Energy. 2023, 110, 108367.
92. Yang, W.; Yang, C.; Jing, G.; et al. Preparation of polymer composites with electrostatic spinning promotes wound regeneration: a review. AIP. Advances. 2024, 14, 090701.
93. Lin, X.; Xue, H.; Li, F.; Mei, H.; Zhao, H.; Zhang, T. All-nanofibrous ionic capacitive pressure sensor for wearable applications. ACS. Appl. Mater. Interfaces. 2022, 14, 31385-95.
94. Wang, P.; Li, G.; Yu, W.; Meng, C.; Guo, S. Flexible pseudocapacitive iontronic tactile sensor based on microsphere-decorated electrode and microporous polymer electrolyte for ultrasensitive pressure detection. Adv. Elect. Mater. 2022, 8, 2101269.
95. Yang, Z.; Duan, Q.; Zang, J.; et al. Boron nitride-enabled printing of a highly sensitive and flexible iontronic pressure sensing system for spatial mapping. Microsyst. Nanoeng. 2023, 9, 68.
96. Wang, X.; Wu, G.; Zhang, X.; et al. Traditional Chinese medicine (TCM)-inspired fully printed soft pressure sensor array with self-adaptive pressurization for highly reliable individualized long-term pulse diagnostics. Adv. Mater. 2025, 37, e2410312.
97. Guan, T.; Li, H.; Liu, J.; et al. Preparation of ion composite photosensitive resin and its application in 3D-printing highly sensitive pressure sensor. Sensors. (Basel). 2025, 25, 1348.
98. Zheng, X.; Li, Y.; Zhou, Q.; et al. Biocompatible, biodegradable, and high-performance flexible pressure sensors for severity grading and rehabilitation assessment in Parkinson’s disease management. Nano. Energy. 2025, 140, 111030.
99. Yang, X.; Wang, Y.; Qing, X. Electrospun ionic nanofiber membrane-based fast and highly sensitive capacitive pressure sensor. IEEE. Access. 2019, 7, 139984-93.
100. Shukla, S. Freeze drying process: a review. Int. J. Pharm. Sci. Res. 2011, 2, 3061-8. Available from: https://pdfs.semanticscholar.org/d282/c74d09f5e6f0c007eb8cb6239e4f960358d3.pdf (accessed 31 December 2025).
101. Assegehegn, G.; Brito-de la Fuente, E.; Franco, J. M.; Gallegos, C. The importance of understanding the freezing step and its impact on freeze-drying process performance. J. Pharm. Sci. 2019, 108, 1378-95.
102. Ying, B.; Chen, R. Z.; Zuo, R.; Li, J.; Liu, X. An anti-freezing, ambient-stable and highly stretchable ionic skin with strong surface adhesion for wearable sensing and soft robotics. Adv. Funct. Mater. 2021, 31, 2104665.
103. Li, J.; Lu, J.; Zhang, K.; et al. Freeze-drying induced gradient microporous composite film with high ionic conductivity for ultrasensitive wearable iontronic pressure sensor. Chem. Eng. J. 2024, 493, 152450.
104. Ren, Y.; Liu, Z.; Jin, G.; et al. Electric-field-induced gradient ionogels for highly sensitive, broad-range-response, and freeze/heat-resistant ionic fingers. Adv. Mater. 2021, 33, e2008486.
105. Yang, Z.; Zhao, Y.; Lan, Y.; et al. Screen-printable iontronic pressure sensor with thermal expansion microspheres for pulse monitoring. ACS. Appl. Mater. Interfaces. 2024, 16, 39561-71.
106. Riemer, D. The theoretical fundamentals of the screen printing process. Hybrid. Circuits. 1989, 6, 8-17.
107. Ma, G.; Guo, F.; Li, Y.; et al. A novel 3D-printed self-healing, touchless, and tactile multifunctional flexible sensor inspired by cutaneous sensory organs. Compos. Commun. 2025, 54, 102287.
108. Zhang, Y.; Tan, C. M. J.; Toepfer, C. N.; Lu, X.; Bayley, H. Microscale droplet assembly enables biocompatible multifunctional modular iontronics. Science 2024, 386, 1024-30.
109. Wei, D.; Guo, J.; Qiu, Y.; et al. Monitoring the delicate operations of surgical robots via ultra-sensitive ionic electronic skin. Natl. Sci. Rev. 2022, 9, nwac227.
110. Huang, Y.; Zhou, Y.; Wieland, S.; Li, Y.; Zhao, N.; Zaumseil, J. Tunable tactile synapses enabled by erasable doping in iongel-gated nanotube network transistors. Adv. Funct. Mater. 2025, 35, 2423030.
111. You, J.; Lu, M.; Dazhen, L.; et al. Anti-motion artifacts iontronic sensor for long-term accurate fingertip pulse monitoring. Adv. Sci. (Weinh). 2025, 12, e2414425.
112. Yang, Q.; Ye, Z.; Wu, R.; et al. A highly sensitive iontronic bimodal sensor with pressure‐temperature discriminability for robot skin. Adv. Mater. Technol. 2023, 8, 2300561.
113. Guo, H.; Liu, J.; Liu, H.; Yang, M.; Zhao, J.; Lu, T. Iontronic dynamic sensor with broad bandwidth and flat frequency response using controlled preloading strategy. ACS. Nano. 2024, 18, 5599-608.
114. Lv, T.; Li, Z.; Lv, C.; Zhang, X.; Li, Y.; Xie, M. Highly sensitive multifunctional flexible capacitive ionogel sensor for proximity,pressure and temperature perception. IEEE. Sen. J. 2025, 25, 33756-64.
115. Niu, H.; Wei, X.; Li, H.; et al. Micropyramid array bimodal electronic skin for intelligent material and surface shape perception based on capacitive sensing. Adv. Sci. (Weinh). 2024, 11, e2305528.
116. Tang, J.; Zhao, C.; Luo, Q.; Chang, Y.; Yang, Z.; Pan, T. Ultrahigh-transparency and pressure-sensitive iontronic device for tactile intelligence. NPJ. Flex. Electron. 2022, 6, 54.
117. Liu, C.; Ma, F.; Sun, Q.; et al. Highly sensitive flexible capacitive pressure sensor based on a multicross-linked dual-network ionic hydrogel for blood pressure monitoring applications. ACS. Appl. Mater. Interfaces. 2024, 16, 34042-56.
118. Wang, J.; Xiong, Z.; Wu, L.; Chen, J.; Zhu, Y. Highly sensitive and wide-range iontronic pressure sensors with a wheat awn-like hierarchical structure. J. Colloid. Interface. Sci. 2024, 669, 190-7.
119. Su, Q.; Liu, C.; Xue, T.; Zou, Q. Sensitivity-photo-patternable ionic pressure sensor array with a wearable measurement unit. ACS. Appl. Mater. Interfaces. 2022, 14, 33641-9.
120. Zhao, J.; Guo, H.; Liu, H.; et al. Carbon nanotube network topology-enhanced iontronic capacitive pressure sensor with high linearity and ultrahigh sensitivity. ACS. Appl. Mater. Interfaces. 2023, 15, 47327-37.
121. He, Q.; Zhou, Z.; Swe, M. M.; Tang, C. G.; Wang, Y.; Leong, W. L. Skin-inspired flexible and printed iontronic sensor enables bimodal sensing of robot skin for machine-learning-assisted object recognition. Nano. Energy. 2025, 134, 110583.
122. Cho, S. H.; Lee, S. W.; Yu, S.; et al. Micropatterned pyramidal ionic gels for sensing broad-range pressures with high sensitivity. ACS. Appl. Mater. Interfaces. 2017, 9, 10128-35.
123. Xu, R.; Xu, T.; She, M.; et al. Skin-friendly large matrix iontronic sensing meta-fabric for spasticity visualization and rehabilitation training via piezo-ionic dynamics. Nanomicro. Lett. 2024, 17, 90.
124. Wu, B.; Wu, W.; Ma, R.; et al. High-sensitivity and wide-range flexible ionic piezocapacitive pressure sensors with porous hemisphere array electrodes. Sensors. (Basel). 2024, 24, 366.
125. Cheng, A. J.; Chang, W.; Qiao, Y.; et al. High-performance supercapacitive pressure sensors via height-grading micro-domes of ionic conductive elastomer. ACS. Appl. Mater. Interfaces. 2024, 16, 59614-25.
126. Wu, W.; Wang, H.; Peng, X.; Ni, F.; Qiu, L.; Wang, X. Pressure and temperature bimodal tactile sensor based on electrical double-layer effect of ionic liquids. Sens. Actuat. A-Phys. 2025, 387, 116377.
127. Liu, J.; Liu, H.; Guo, H.; Huang, L.; Lu, T. Self-powered iontronic capacitive sensing unit with high sensitivity in charge-output mode. Adv. Funct. Mater. 2024, 35, 2412377.
128. Jin, M. L.; Park, S.; Lee, Y.; et al. An ultrasensitive, visco-poroelastic artificial mechanotransducer skin inspired by Piezo2 protein in mammalian Merkel cells. Adv. Mater. 2017, 29, 1770086.
129. Wang, Y.; Xiang, M.; Li, J.; et al. Highly sensitive flexible iontronic pressure sensor for marine pressure monitoring. IEEE. Electron. Device. Lett. 2024, 45, 2530-3.
130. Su, Q.; Huang, X.; Lan, K.; Xue, T.; Gao, W.; Zou, Q. Highly sensitive ionic pressure sensor based on concave meniscus for electronic skin. J. Micromech. Microeng. 2019, 30, 015009.
131. Li, L.; Zhu, G.; Wang, J.; Chen, J.; Zhao, G.; Zhu, Y. A flexible and ultrasensitive interfacial iontronic multisensory sensor with an array of unique “cup-shaped” microcolumns for detecting pressure and temperature. Nano. Energy. 2023, 105, 108012.
132. Qiao, H.; Liu, X.; Zhang, X.; Zhang, J.; Yin, M.; Yang, Q. A highly sensitive and flexible capacitive pressure sensor based on an ionic hydrogel dielectric layer with a lateral-bending microstructure. J. Mater. Chem. C. 2024, 12, 13485-94.
133. Huang, Y.; Zhao, L.; Cai, M.; et al. Arteriosclerosis assessment based on single-point fingertip pulse monitoring using a wearable iontronic sensor. Adv. Healthc. Mater. 2023, 12, e2301838.
134. Yang, X.; Li, J.; Shu, K.; et al. Customized flexible iontronic pressure sensors: Multilevel microstructures by 3D-printing for enhanced sensitivity and broad pressure range. Chem. Eng. J. 2024, 501, 157291.
135. Wang, P.; Cao, J.; Li, Y.; Sun, G.; Shao, H.; Meng, C. Highly breathable and sensitive iontronic wearable sensor based on porous ionic electrolyte and microstructure for human movement sensing. Chem. Eng. J. 2024, 495, 153525.
136. Yang, X.; Wang, Y.; Sun, H.; Qing, X. A flexible ionic liquid-polyurethane sponge capacitive pressure sensor. Sens. Actuat. A-Phys. 2019, 285, 67-72.
137. Zhu, B.; Guo, J.; Li, W.; et al. Integrated electromechanical structure for iontronic pressure sensors with linear high-sensitivity response and robust sensing stability. Adv. Funct. Mater. 2024, 34, 2406762.
138. Cetin, O.; Cicek, M. O.; Cugunlular, M.; Bolukbasi, T.; Khan, Y.; Unalan, H. E. MXene-deposited melamine foam-based iontronic pressure sensors for wearable electronics and smart numpads. Small 2024, 20, e2403202.
139. Li, B.; Ge, R.; Du, W.; et al. iWood: An intelligent iontronic device for human-wood interactions. Adv. Funct. Mater. 2024, 34, 2314190.
140. Sun, G.; Jiang, Y.; Sun, H.; Wang, P.; Meng, C.; Guo, S. Flexible, breathable, and hydrophobic iontronic tactile sensors based on a nonwoven fabric platform for permeable and waterproof wearable sensing applications. ACS. Appl. Electron. Mater. 2023, 5, 6477-89.
141. Li, Z.; Yang, J.; Zhang, Y.; et al. Ultrafast readout, crosstalk suppression iontronic array enabled by frequency-coding architecture. NPJ. Flex. Electron. 2024, 8, 9.
142. Li, J.; Ma, K.; Qin, B.; et al. An all-in-one wearable device integrating a solid-state zinc-ion battery and a capacitive pressure sensor for intelligent health monitoring. Adv. Funct. Mater. 2024, 34, 2403788.
143. Wu, X.; Liu, Q.; Zheng, L.; et al. Innervate commercial fabrics with spirally-layered iontronic fibrous sensors toward dual-functional smart garments. Adv. Sci. (Weinh). 2024, 11, e2402767.
144. Wang, H.; Zhou, S.; Chang, Y.; et al. Electrospinning fibrous membrane matrix ionic capacitive sensor for pressure value and distribution detection. Sens. Actuat. A-Phys. 2024, 366, 114952.
145. Wang, G.; Duan, J.; Sun, G.; et al. Biomimetic breathable nanofiber electronic skins with temperature-controlled self-adhesive and directional moisture-wicking properties for bifunctional pressure and non-contact sensing. Nano. Energy. 2024, 128, 109779.
146. Li, S.; Chu, J.; Li, B.; Chang, Y.; Pan, T. Handwriting iontronic pressure sensing origami. ACS. Appl. Mater. Interfaces. 2019, 11, 46157-64.
147. Zhao, X.; Yang, M.; Li, F.; et al. A “rigid-flexible” iontronic pressure sensor with high sensitivity and wide response range for hand dysfunction rehabilitation training. Chem. Eng. J. 2025, 507, 160539.
148. Zhang, X.; Lu, Q.; Zhou, L.; Zhang, W.; Zhang, X.; Hu, F. Flexible wearable iontronic pressure sensors based on an array of semiellipsoids with micropillars for health and motion monitoring. ACS. Appl. Electron. Mater. 2025, 7, 1820-8.
149. Wang, D.; Zhao, N.; Yang, Z.; et al. Iontronic capacitance-enhanced flexible three-dimensional force sensor with ultrahigh sensitivity for machine-sensing interface. IEEE. Electron. Device. Lett. 2023, 44, 2023-6.
150. Su, D.; Shen, G.; Ma, K.; et al. Enhanced sensitivity and linear-response in iontronic pressure sensors for non-contact, high-frequency vibration recognition. J. Colloid. Interface. Sci. 2024, 659, 1042-51.
151. Ma, K.; Su, D.; Qin, B.; et al. Ultra-sensitive and stable All-Fiber iontronic tactile sensors under high pressure for human movement monitoring and rehabilitation assessment. Chem. Eng. J. 2024, 486, 150017.
152. Chen, J.; Peng, K.; Yang, Y.; Dai, Y.; Huang, B.; Chen, X. Hierarchical iontronic flexible sensor with high sensitivity over ultrabroad range enabled by equilibration of microstructural compressibility and stability. ACS. Sens. 2025, 10, 921-31.
153. Xia, Y.; Zhi, X.; Guo, M.; Zhang, Y.; Ma, S.; Wang, X. Multimodal, ultrasensitive, and biomimetic electronic skin based on gradient micro-frustum ionogel for imaginary keyboard and haptic cognition. Adv. Funct. Mater. 2024, 35, 2414936.
154. Zhang, J. H.; Li, Z.; Xu, J.; et al. Versatile self-assembled electrospun micropyramid arrays for high-performance on-skin devices with minimal sensory interference. Nat. Commun. 2022, 13, 5839.
155. Wang, Z.; Li, T.; Chen, Y.; et al. Photodimerization induced hierarchical and asymmetric iontronic micropatterns. Nat. Commun. 2022, 13, 6487.
156. Zhang, H.; Yang, D.; Long, Q.; et al. An iontronic flexible pressure sensor based on a multistage gradient micro-dome structure with a broad sensing range for wearable devices. J. Mater. Chem. C. 2024, 12, 17829-40.
157. Cicek, M. O.; Durukan, M. B.; Yıldız, B.; et al. Ultra-sensitive bio-polymer iontronic sensors for object recognition from tactile feedback. Adv. Mater. Technol. 2023, 8, 2300322.
158. Chhetry, A.; Kim, J.; Yoon, H.; Park, J. Y. Ultrasensitive interfacial capacitive pressure sensor based on a randomly distributed microstructured iontronic film for wearable applications. ACS. Appl. Mater. Interfaces. 2019, 11, 3438-49.
159. Shao, B.; Zhang, S.; Hu, Y.; et al. Color-shifting iontronic skin for on-site, nonpixelated pressure mapping visualization. Nano. Lett. 2024.
160. Zheng, Y.; Lin, T.; Zhao, N.; et al. Highly sensitive electronic skin with a linear response based on the strategy of controlling the contact area. Nano. Energy. 2021, 85, 106013.
161. Cho, C.; Kim, D.; Lee, C.; Oh, J. H. Ultrasensitive ionic liquid polymer composites with a convex and wrinkled microstructure and their application as wearable pressure sensors. ACS. Appl. Mater. Interfaces. 2023, 15, 13625-36.
162. Bai, L.; Jin, Y.; Shang, X.; Jin, H.; Zhou, Y.; Shi, L. Highly synergistic, electromechanical and mechanochromic dual-sensing ionic skin with multiple monitoring, antibacterial, self-healing, and anti-freezing functions. J. Mater. Chem. A. 2021, 9, 23916-28.
163. Bi, X.; Yao, M.; Huang, Z.; et al. Biomimetic electronic skin based on a stretchable ionogel mechanoreceptor composed of crumpled conductive rubber electrodes for synchronous strain, pressure, and temperature detection. ACS. Appl. Mater. Interfaces. 2024, 16, 21341-55.
164. Yuan, H.; Zhang, Q.; Cheng, Y.; et al. Double-sided microstructured flexible iontronic pressure sensor with wide linear sensing range. J. Colloid. Interface. Sci. 2024, 670, 41-9.
165. Kou, H.; Pang, Y.; Yang, L.; et al. Ultrasensitive iontronic pressure sensor based on microstructure ionogel dielectric layer for wearable electronics. Nanotechnol. Precis. Eng. 2025, 8, 023010.
166. Niu, H.; Li, H.; Gao, S.; et al. Perception-to-cognition tactile sensing based on artificial-intelligence-motivated human full-skin bionic electronic skin. Adv. Mater. 2022, 34, e2202622.
167. Niu, H.; Li, H.; Li, N.; et al. Intelligent robotic sensory system with epidermis-dermis bionic electronic skin for autonomous hardness/softness-based material perception. Adv. Funct. Mater. 2025, 35, 2500511.
168. Xiao, Y.; Duan, Y.; Li, N.; et al. Multilayer double-sided microstructured flexible iontronic pressure sensor with a record-wide linear working range. ACS. Sens. 2021, 6, 1785-95.
169. Liu, X.; Li, Y.; Li, Y.; et al. Bionic fingerprint tactile sensor with deep learning-decoupled multimodal perception for simultaneous pressure-friction mapping. Adv. Funct. Mater. 2025, 35, e06158.
170. Lin, Q.; Huang, J.; Yang, J.; et al. Highly sensitive flexible iontronic pressure sensor for fingertip pulse monitoring. Adv. Healthc. Mater. 2020, 9, e2001023.
171. Xu, R.; She, M.; Liu, J.; et al. Skin-friendly and wearable iontronic touch panel for virtual-real handwriting interaction. ACS. Nano. 2023, 17, 8293-302.
172. Zhang, M.; Gu, M.; Shao, L.; et al. Flexible wearable capacitive sensors based on ionic gel with full-pressure ranges. ACS. Appl. Mater. Interfaces. 2023, 15, 15884-92.
173. Xu, H.; Gao, L.; Zhao, H.; et al. Stretchable and anti-impact iontronic pressure sensor with an ultrabroad linear range for biophysical monitoring and deep learning-aided knee rehabilitation. Microsyst. Nanoeng. 2021, 7, 92.
174. Wang, D.; Li, B.; Niu, S.; Han, Z.; Ren, L. Novel iontronic pressure sensor coupling high sensitivity and wide-range for stiffness identification and long-distance precise motion control. Adv. Funct. Mater. 2024, 35, 2413551.
175. Jiang, D.; Wang, T.; Wang, E.; et al. Triboelectric and iontronic dual-responsive bioinspired ionic skin for human-like dexterous robotic manipulation. Nano. Energy. 2024, 131, 110257.
176. Li, Q.; Chen, G.; Cui, Y.; et al. Highly thermal-wet comfortable and conformal silk-based electrodes for on-skin sensors with sweat tolerance. ACS. Nano. 2021, 15, 9955-66.
