Sensitive, High-Strain, High-Rate Bodily Motion Sensors Based on Graphene鈥揜ubber Composites
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- 作者：Conor S. Boland ; Umar Khan ; Claudia Backes ; Arlene O鈥橬eill ; Joe McCauley ; Shane Duane ; Ravi Shanker ; Yang Liu ; Izabela Jurewicz ; Alan B. Dalton ; Jonathan N. Coleman
- 刊名：ACS Nano
- 出版年：2014
- 出版时间：September 23, 2014
- 年：2014
- 卷：8
- 期：9
- 页码：8819-8830
- 全文大小：691K
- ISSN：1936-086X
文摘
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 104-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.