期刊
ADVANCED MATERIALS
卷 34, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202105996
关键词
3D printing; 3D tactile sensors; ionic conductors; solid-state ionoelastomers
类别
资金
- Research Grants Council of Hong Kong [11275216, 11218417]
- Innovation and Technology Fund [9440248]
- City University of Hong Kong [9680212, 9610375]
A fast photocurable, solid-state conductive ionoelastomer (SCIE) has been developed for high-resolution 3D printing of arbitrary architectures. The printed building blocks possess high-resolution architectures, good Young's modulus, stretchability, excellent conductivity tolerance in a wide range of temperatures, as well as fine elasticity and antifatigue ability even after long-term loading-unloading cycles. Additionally, the printed building blocks can be programmed into 3D flexible tactile sensors with significantly higher sensitivity than their bulky counterparts.
Shaping soft and conductive materials into preferential architectures via 3D printing is highly attractive for numerous applications ranging from tactile devices to bioelectronics. A landmark type of soft and conductive materials is hydrogels/ionogels. However, 3D-printed hydrogels/ionogels still suffer from a fundamental bottleneck: limited stability in their electrical-mechanical properties caused by the evaporation and leakage of liquid within hydrogels/ionogels. Although photocurable liquid-free ion-conducting elastomers can circumvent these limitations, the associated photocurable process is cumbersome and hence the printing quality is relatively poor. Herein, a fast photocurable, solid-state conductive ionoelastomer (SCIE) is developed that enables high-resolution 3D printing of arbitrary architectures. The printed building blocks possess many promising features over the conventional ion-conducting materials, including high resolution architectures (even approximate to 50 mu m overhanging lattices), good Young's modulus (up to approximate to 6.2 MPa), and stretchability (fracture strain of approximate to 292%), excellent conductivity tolerance in a wide range of temperatures (from -30 to 80 degrees C), as well as fine elasticity and antifatigue ability even after 10 000 loading-unloading cycles. It is further demonstrated that the printed building blocks can be programmed into 3D flexible tactile sensors such as gyroid-based piezoresistive sensor and gap-based capacitive sensor, both of which exhibit several times higher in sensitivity than their bulky counterparts.
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