Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 14, Pages 16822-16830Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c01794
Keywords
all-carbon aerogel; compressible; fatigue resistance; piezoresistive sensor; wearable electronics
Funding
- National Natural Science Foundation of China [81501521]
- Fundamental Research Funds for the Central Universities [18CX02037A, YCX2019091]
- National Key Technologies R&D Program of China
- Key Projects of Intergovernmental International Innovation Cooperation [2018YFE0118200]
- Shandong Key Research and Development Project [2019JZZY010506]
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Compressible and ultralight all-carbon materials are promising candidates for piezoresistive pressure sensors. Although several fabrication methods have been developed, the required elasticity and fatigue resistance of all-carbon materials are yet to be satisfied as a result of energy loss and structure-derived fatigue failure. Herein, we present a two-stage solvothermal freeze-casting approach to fabricate all-carbon aerogel [modified graphene aerogel (MGA)] with a multi-arched structure, which is enabled by the in-depth solvothermal reduction of graphene oxide and unidirectional ice-crystal growth. MGA exhibits supercompressibility and superelasticity, which can resist an extreme compressive strain of 99% and maintain 93.4% height retention after 100 000 cycles at the strain of 80%. Rebound experiments reveal that MGA can rebound the ball (367 times heavier than the aerogel) in 0.02 s with a very fast recovery speed (similar to 615 mm s(-1)). Even if the mass ratio between the ball and aerogel is increased to 1306, the ball can be rebound in a relatively short time (0.04 s) with a fast recovery speed (similar to 535 mm s(-1)). As a result of its excellent mechanical robustness and electrical conductivity, MGA presents a stable stress-current response (10 000 cycles), tunable linear sensitivity (9.13-7.29 kPa(-1)), and low power consumption (4 mW). The MGA-based wearable pressure sensor can monitor human physiological signals, such as pulses, sound vibrations, and muscular movements, demonstrating its potential practicability as a wearable device.
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