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Multi-Arch-Structured All-Carbon Aerogels with Superelasticity and High Fatigue Resistance as Wearable Sensors
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-03-29 , DOI: 10.1021/acsami.0c01794
Jiankun Huang 1 , Jingbin Zeng 1 , Baoqiang Liang 2 , Junwei Wu 2 , Tongge Li 2 , Qing Li 1 , Fan Feng 2 , Qingwen Feng 2 , Mark J. Rood 3 , Zifeng Yan 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-03-29 , DOI: 10.1021/acsami.0c01794
Jiankun Huang 1 , Jingbin Zeng 1 , Baoqiang Liang 2 , Junwei Wu 2 , Tongge Li 2 , Qing Li 1 , Fan Feng 2 , Qingwen Feng 2 , Mark J. Rood 3 , Zifeng Yan 2
Affiliation
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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 (∼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 (∼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.
中文翻译：
具有超弹性和高抗疲劳性的多弧结构全碳气凝胶作为可穿戴传感器
可压缩且超轻的全碳材料是压阻式压力传感器的有希望的候选材料。尽管已经开发了几种制造方法，但是由于能量损失和源自结构的疲劳破坏，全碳材料所需的弹性和抗疲劳性尚未得到满足。本文中，我们提出了一种两阶段的溶剂热冷冻铸造方法，以制造具有多弓形结构的全碳气凝胶[改性石墨烯气凝胶（MGA）]，这可以通过对石墨烯氧化物和单向冰进行深度溶剂热还原来实现-晶体生长。MGA具有超压缩性和超弹性，可以抵抗99％的极端压缩应变，并在80％应变10万次循环后保持93.4％的高度保持力。–1）。即使球与气凝胶之间的质量比增加到1306，球也可以在相对较短的时间内（0.04 s）以快速恢复速度（〜535 mm s –1）反弹。由于其出色的机械强度和导电性，MGA表现出稳定的应力-电流响应（10000次循环），可调的线性灵敏度（9.13-7.29 kPa -1）和低功耗（4 mW）。基于MGA的可穿戴压力传感器可以监视人体生理信号，例如脉冲，声音振动和肌肉运动，从而证明了其作为可穿戴设备的潜在实用性。
更新日期：2020-03-30
中文翻译：
具有超弹性和高抗疲劳性的多弧结构全碳气凝胶作为可穿戴传感器
可压缩且超轻的全碳材料是压阻式压力传感器的有希望的候选材料。尽管已经开发了几种制造方法，但是由于能量损失和源自结构的疲劳破坏，全碳材料所需的弹性和抗疲劳性尚未得到满足。本文中，我们提出了一种两阶段的溶剂热冷冻铸造方法，以制造具有多弓形结构的全碳气凝胶[改性石墨烯气凝胶（MGA）]，这可以通过对石墨烯氧化物和单向冰进行深度溶剂热还原来实现-晶体生长。MGA具有超压缩性和超弹性，可以抵抗99％的极端压缩应变，并在80％应变10万次循环后保持93.4％的高度保持力。–1）。即使球与气凝胶之间的质量比增加到1306，球也可以在相对较短的时间内（0.04 s）以快速恢复速度（〜535 mm s –1）反弹。由于其出色的机械强度和导电性，MGA表现出稳定的应力-电流响应（10000次循环），可调的线性灵敏度（9.13-7.29 kPa -1）和低功耗（4 mW）。基于MGA的可穿戴压力传感器可以监视人体生理信号，例如脉冲，声音振动和肌肉运动，从而证明了其作为可穿戴设备的潜在实用性。
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