School of Physics, CRANN and AMBER, Trinity College Dublin , Dublin 2, Ireland.
ACS Nano. 2014 Sep 23;8(9):8819-30. doi: 10.1021/nn503454h. Epub 2014 Aug 19.
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.
人体运动监测需要能够检测位置、速度和加速度的可穿戴传感器。这些传感器应该便宜、轻便、机械顺应性好，并且在高应变和应变速率下具有合理的灵敏度。目前还没有报道的材料同时满足了所有上述要求。在这里，我们描述了一种将液体剥离的石墨烯注入天然橡胶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，其电阻增加了 10(4)倍，应变超过 800%。灵敏度相当高，观察到的灵敏系数高达 35。更重要的是，这些传感器可以有效地跟踪动态应变，在至少 160 Hz 的振动频率下工作良好。在 60 Hz 时，我们可以监测至少 6%的应变，应变率超过 6000%/s。我们已经将这些复合材料用作身体运动传感器，有效地监测关节和肌肉运动以及呼吸和脉搏。
