Kim Soaram, Dong Yongchang, Hossain Md Maksudul, Gorman Sean, Towfeeq Itmenon, Gajula Durga, Childress Anthony, Rao Apparao M, Koley Goutam
Department of Electrical and Computer Engineering , University of Maryland , College Park , Maryland 20742 , United States.
ACS Appl Mater Interfaces. 2019 May 1;11(17):16006-16017. doi: 10.1021/acsami.9b01964. Epub 2019 Apr 18.
We report on a novel graphene/P(VDF-TrFE) heterostructure based highly sensitive, flexible, and biocompatible pressure/strain sensor developed through a facile and low-cost fabrication technique. The high piezoelectric coefficient of P(VDF-TrFE) coupled with outstanding electrical properties of graphene makes the sensor device highly sensitive, with an average sensitivity of 0.76 kPa, a gauge factor of 445, and signal-to-noise ratio of 60.8 dB in the range of pressure up to 45 mmHg. A model was proposed to explain the sensor operation, based on carrier density and mobility changes induced by the piezoelectric charge generated in response to strain, which was supported by Hall measurements and Raman spectroscopy. Potential applications in wearable sensing for human activity monitoring were also demonstrated.
我们报道了一种基于新型石墨烯/P（VDF-TrFE）异质结构的高灵敏度、柔性且生物相容的压力/应变传感器，该传感器是通过一种简便且低成本的制造技术开发的。P（VDF-TrFE）的高压电系数与石墨烯出色的电学性能相结合，使得该传感器器件具有高灵敏度，在高达45 mmHg的压力范围内，平均灵敏度为0.76 kPa，应变片系数为445，信噪比为60.8 dB。基于响应应变产生的压电电荷引起的载流子密度和迁移率变化，提出了一个模型来解释传感器的工作原理，霍尔测量和拉曼光谱对该模型提供了支持。还展示了其在用于人类活动监测的可穿戴传感方面的潜在应用。
