Sensitive, High-Strain, High-Rate Bodily Motion Sensors Based on Graphene-Rubber Composites
Sensitive, High-Strain, High-Rate Bodily Motion Sensors Based on Graphene-Rubber Composites
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DOI：
10.1021/nn503454h
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发表时间：
2014-09-01
期刊：
影响因子：
17.1
通讯作者：
Coleman, Jonathan N.
中科院分区：
文献类型：
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作者：
Boland, Conor S.;Khan, Umar;Coleman, Jonathan N.
监测人体运动需要可检测位置、速度和加速度的可穿戴传感器。它们应该便宜、重量轻、机械顺应性并且在高应变和应变率下表现出合理的灵敏度。没有报道材料同时证明了所有上述要求。在这里，我们描述了一种将液体剥离石墨烯注入天然橡胶中以制造导电复合材料的简单方法。这些材料是出色的应变传感器，电阻增加了 10(4) 倍，并且在超过 800% 的应变下工作。灵敏度相当高，观测到的规范因子高达 35。更重要的是，这些传感器可以有效跟踪动态应变，在至少 160 Hz 的振动频率下工作良好。在 60 Hz 频率下，我们可以在应变率超过 6000%/s 时监测至少 6% 的应变。我们使用这些复合材料作为身体运动传感器，有效监测关节和肌肉运动以及呼吸和脉搏。
Monitoring of human bodily motion requires wearable sensors that can detect position, velocity and acceleration. They should be cheap, lightweight, mechanically compliant and display reasonable sensitivity at high strains and strain rates. No reported material has simultaneously demonstrated all the above requirements. Here we describe a simple method to infuse liquid-exfoliated graphene into natural rubber to create conducting composites. These materials are excellent strain sensors displaying 10(4)-fold increases in resistance and working at strains exceeding 800%. The sensitivity is reasonably high, with gauge factors of up to 35 observed. More importantly, these sensors can effectively track dynamic strain, working well at vibration frequencies of at least 160 Hz. At 60 Hz, we could monitor strains of at least 6% at strain rates exceeding 6000%/s. We have used these composites as bodily motion sensors, effectively monitoring joint and muscle motion as well and breathing and pulse.