Self-assembled aqueous liquid metal inks for stretchable conductors and circuits
Source abstract
Abstract
Liquid metals (LMs) characterized with high conductivity and inherent deformability are potential materials for stretchable electronics and circuits. However, technological challenges associated with facile and efficient patterning of LMs currently impede their widespread implementation. Here, we present an environmentally friendly approach for the facile fabrication of stretchable conductors and circuits through the self-assembly of aqueous LM inks. This process leverages the anisotropic surface characteristics that drive the movement of the ink from hydrophobic to hydrophilic regions. Simultaneously, the ink with a stabilizer mitigated the premature deposition of LM particles. This culminated in the precise deposition of LM particles in accordance with the desired patterns on the substrate. The resulting LM patterns exhibit high resolution (<100 μm line width), high conductivity (2.0 × 10⁵ S m−1), and excellent electromechanical durability. Further demonstrated applications including stretchable displays, three-dimensional touch sensors and soft actuators showcase the versatility of this fabrication for stretchable electronics.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced Sensor and Energy Harvesting Materials · Advanced Materials and Mechanics · Nanomaterials and Printing Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (48)
Show source-provided references
1. Zhong, D. et al. High-speed and large-scale intrinsically stretchable integrated circuits. Nature 627, 313–320 (2024).10.1038/s41586-024-07096-7 ↗
2. Li, J. et al. High-fidelity, low-hysteresis bionic flexible strain sensors for soft machines. ACS Nano 18, 2520–2530 (2024).10.1021/acsnano.3c11711 ↗
3. Gul, O. et al. Bioinspired interfacial engineering for highly stretchable electronics. Nat. Commun. 16, 1337 (2025).10.1038/s41467-025-56502-9 ↗
4. Li, H. et al. E-tattoos: toward functional but imperceptible interfacing with human skin. Chem. Rev. 124, 3220–3283 (2024).10.1021/acs.chemrev.3c00626 ↗
5. Beltrão, M., Duarte, F. M., Viana, J. C. & Paulo, V. A review on in-mold electronics technology. Polym. Eng. Sci. 62, 967–990 (2022).10.1002/pen.25918 ↗
6. Lee, S. Y. et al. The development and investigation of highly stretchable conductive inks for 3-dimensional printed in-mold electronics. Org. Electron. 85, 105881 (2020).10.1016/j.orgel.2020.105881 ↗
7. Wang, C., Wang, C., Huang, Z. & Xu, S. Materials and structures toward soft electronics. Adv. Mater. 30, 1801368 (2018).10.1002/adma.201801368 ↗
8. Callens, S. J. P. & Zadpoor, A. A. From flat sheets to curved geometries: origami and kirigami approaches. Mater. Today 21, 241–264 (2018).10.1016/j.mattod.2017.10.004 ↗
9. Kim, D. C., Shim, H. J., Lee, W., Koo, J. H. & Kim, D. H. Material-based approaches for the fabrication of stretchable electronics. Adv. Mater. 32, 1902743 (2020).10.1002/adma.201902743 ↗
10. Li, Y. et al. Boosting the performance of pedot:Pss based electronics via ionic liquids. Adv. Mater. 36, 2310973 (2024).10.1002/adma.202310973 ↗
11. Yao, X. et al. Super stretchable, self-healing, adhesive ionic conductive hydrogels based on tailor-made ionic liquid for high-performance strain sensors. Adv. Funct. Mater. 32, 2204565 (2022).10.1002/adfm.202204565 ↗
12. Jung, D. et al. Highly conductive and elastic nanomembrane for skin electronics. Science 373, 1022–1026 (2021).10.1126/science.abh4357 ↗
13. Kim, Y. et al. Stretchable nanoparticle conductors with self-organized conductive pathways. Nature 500, 59–63 (2013).10.1038/nature12401 ↗
14. Gu, C. et al. Highly conductive, super-stretchable and stable stretchable conductor with cnt and liquid metal alternating layered structure. Chem. Eng. J. 487, 150589 (2024).10.1016/j.cej.2024.150589 ↗
15. Kim, M., Lim, H. & Ko, S. H. Liquid metal patterning and unique properties for next-generation soft electronics. Adv. Sci. 10, 2205795 (2023).10.1002/advs.202205795 ↗
16. Lee, W. et al. Universal assembly of liquid metal particles in polymers enables elastic printed circuit board. Science 378, 637–641 (2022).10.1126/science.abo6631 ↗
17. Lin, R. et al. Digitally-embroidered liquid metal electronic textiles for wearable wireless systems. Nat. Commun. 13, 2190 (2022).10.1038/s41467-022-29859-4 ↗
18. Liu, S., Shah, D. S. & Kramer-Bottiglio, R. Highly stretchable multilayer electronic circuits using biphasic gallium-indium. Nat. Mater. 20, 851–858 (2021).10.1038/s41563-021-00921-8 ↗
19. Ma, J. et al. Shaping a soft future: patterning liquid metals. Adv. Mater. 35, 2205196 (2023).10.1002/adma.202205196 ↗
20. Tang, S.-Y., Tabor, C., Kalantar-Zadeh, K. & Dickey, M. D. Gallium liquid metal: the devil’s elixir. Annu. Rev. Mater. Res. 51, 381–408 (2021).10.1146/annurev-matsci-080819-125403 ↗
21. Zhu, H. et al. Fully solution processed liquid metal features as highly conductive and ultrastretchable conductors. npj flex. electron. 5, 25 (2021).10.1038/s41528-021-00123-x ↗
22. Rahman, M. S., Agnew, S. A., Ong, S. W. & Scheideler, W. J. Kinetic liquid metal synthesis of flexible 2d conductive oxides for multimodal wearable sensing. npj flex. electron. 8, 80 (2024).10.1038/s41528-024-00371-7 ↗
23. Kim, M. et al. Nanowire-assisted freestanding liquid metal thin-film patterns for highly stretchable electrodes on 3d surfaces. npj flex. electron. 6, 99 (2022).10.1038/s41528-022-00232-1 ↗
24. Sun, Y.-C., Boero, G. & Brugger, J. Stretchable conductors fabricated by stencil lithography and centrifugal force-assisted patterning of liquid metal. ACS Appl. Electron. Mater. 3, 5423–5432 (2021).10.1021/acsaelm.1c00884 ↗
25. Hu, G. et al. A facile and scalable patterning approach for ultrastretchable liquid metal features. Lab Chip 22, 4933–4940 (2022).10.1039/D2LC00872F ↗
26. Tang, L., Mou, L., Zhang, W. & Jiang, X. Large-scale fabrication of highly elastic conductors on a broad range of surfaces. ACS Appl. Mater. Interfaces 11, 7138–7147 (2019).10.1021/acsami.8b20460 ↗
27. Rahim, M. A. et al. Polyphenol-induced adhesive liquid metal inks for substrate-independent direct pen writing. Adv. Funct. Mater. 31, 2007336 (2020).10.1002/adfm.202007336 ↗
28. Lee, G.-H. et al. Rapid meniscus-guided printing of stable semi-solid-state liquid metal microgranular-particle for soft electronics. Nat. Commun. 13, 2643 (2022).10.1038/s41467-022-30427-z ↗
29. Chen, W. et al. Directly printable and adhesive liquid metal ink for wearable devices. Adv. Funct. Mater. 35, 2411647 (2024).10.1002/adfm.202411647 ↗
30. Xu, P., Zhu, L. & Chang, B. Liquid metal/sodium alginate composites for direct-ink-writing functional soft components of a variable-stiffness soft robot. ACS Appl. Electron. Mater. 6, 8838–8848 (2024).10.1021/acsaelm.4c01546 ↗
31. Lee, S. et al. Connecting the dots: sintering of liquid metal particles for soft and stretchable conductors. Chem. Rev. 125, 3551–3585 (2025).10.1021/acs.chemrev.4c00850 ↗
32. Li, X. et al. Evaporation-induced sintering of liquid metal droplets with biological nanofibrils for flexible conductivity and responsive actuation. Nat. Commun. 10, 3514 (2019).10.1038/s41467-019-11466-5 ↗
33. Lee, S. et al. Phase-change metal ink with ph-controlled chemical sintering for versatile and scalable fabrication of variable stiffness electronics. Sci. Adv. 11, eadv4921 (2025).10.1126/sciadv.adv4921 ↗
34. Zhu, Z. et al. Ultrafast impact superspreading on superamphiphilic silicon surfaces for effective thermal management. J. Am. Chem. Soc. 145, 15128–15136 (2023).10.1021/jacs.3c01394 ↗
35. Chaudhury, M. K., Chakrabarti, A. & Daniel, S. Generation of motion of drops with interfacial contact. Langmuir 31, 9266–9281 (2015).10.1021/la504925u ↗
36. Li, J. & Guo, Z. Spontaneous directional transportations of water droplets on surfaces driven by gradient structures. Nanoscale 10, 13814–13831 (2018).10.1039/C8NR04354J ↗
37. Zhang, M. et al. Bio-inspired differential capillary migration of aqueous liquid metal ink for rapid fabrication of high-precision monolayer and multilayer circuits. Adv. Funct. Mater. 33, 2215050 (2023).10.1002/adfm.202215050 ↗
38. Zhang, L., Guo, Z., Sarma, J., Zhao, W. & Dai, X. Gradient quasi-liquid surface enabled self-propulsion of highly wetting liquids. Adv. Funct. Mater. 31, 2008614 (2021).10.1002/adfm.202008614 ↗
39. Lin, Z. et al. High internal phase emulsions gel ink for direct-ink-writing 3d printing of liquid metal. Nat. Commun. 15, 4806 (2024).10.1038/s41467-024-48906-w ↗
40. Kamble, S. et al. Revisiting zeta potential, the key feature of interfacial phenomena, with applications and recent advancements. ChemistrySelect 7, e202103084 (2022).10.1002/slct.202103084 ↗
41. Rodriguez-Loya, J., Lerma, M. & Gardea-Torresdey, J. L. Dynamic light scattering and its application to control nanoparticle aggregation in colloidal systems: a review. Micromachines 15, 24 (2023).10.3390/mi15010024 ↗
42. Abka-khajouei, R. et al. Structures, properties and applications of alginates. Mar. Drugs 20, 364 (2022).10.3390/md20060364 ↗
43. Wei, Q. et al. Modification, 3d printing process and application of sodium alginate based hydrogels in soft tissue engineering: a review. Int. J. Biol. Macromol. 232, 123450 (2023).10.1016/j.ijbiomac.2023.123450 ↗
44. Sanchez-Botero, L., Shah, D. S. & Kramer-Bottiglio, R. Are liquid metals bulk conductors? Adv. Mater. 34, 2109427 (2022).10.1002/adma.202109427 ↗
45. Gong, Y., Cha, K. J. & Park, J. M. Deformation characteristics and resistance distribution in thermoforming of printed electrical circuits for in-mold electronics application. Int. J. Adv. Manuf. Technol. 108, 749–758 (2020).10.1007/s00170-020-05377-9 ↗
46. Choi, J. et al. Customizable, conformal, and stretchable 3d electronics via predistorted pattern generation and thermoforming. Sci. Adv. 7, eabj0694 (2021).10.1126/sciadv.abj0694 ↗
47. Ebrahimi, N. et al. Magnetic actuation methods in bio/soft robotics. Adv. Funct. Mater. 31, 2005137 (2020).10.1002/adfm.202005137 ↗
48. Mao, G. et al. Soft electromagnetic actuators. Sci. Adv. 6, eabc0251 (2020).10.1126/sciadv.abc0251 ↗