Journal
ACS NANO
Volume 16, Issue 1, Pages 1567-1577Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c10151
Keywords
Ti3C2Tx MXene; multibond network; super tough; intelligent; nanocomposite physical hydrogels
Categories
Funding
- National Natural Science Foundation of China [21774069, 51633003, 21474058]
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Stretchable and conductive hydrogels with excellent mechanical and electrical properties are prepared by a multibond network design, showing great potential for intelligent flexible electronic devices.
Stretchable and conductive hydrogels have emerged as promising candidates for intelligent and flexible electronic devices. Herein, based on a multibond network (MBN) design rationale, super tough and highly stretchable nanocomposite physical hydrogels are prepared, where 2D Ti3C2Tx MXene nanosheets serve as multifunctional cross-linkers and effective stress transfer centers. Further MXene-poly(acrylic acid) (PAA)-Fe3+ MBN physical hydrogels fabricated through controlled permeation of Fe3+ exhibit prominent and well-balanced mechanical properties (e.g., the tensile strength can reach 10.4 MPa and elongation at break can be as high as 3080%), attributed to the dual cross-linking network with dense Fe3+-mediated coordination cross-links between MXene nanosheets and PAA chains and sparse carboxy-Fe3+ cross-links between PAA chains. Moreover, both conductive MXene nanosheets and numerous ions endow the hydrogels with superior conductivity (up to 3.8 S m(-1)), strain sensitivity (high gauge factor of 10.09), and self-healing performance, showing great prospect as intelligent flexible electronics.
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