Ultra-Sensitive Aorta Pressure Sensor Based on Graphene

The graphene-based strain sensors have attracted much attention recently. Usually, there is a tradeoff between the sensitivity and resistance of such devices for larger resistance devices cost higher energy consumption. As the Aorta pressure sensor, smaller device is needed for less invasive to the human body. In this paper, we report an ultra-sensitive graphene-based pressure sensor whose sensitivity can be tuned by the original resistance in different growth condition. For a typical pressure sensor device, the gauge factor can be achieved <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\sim 10^{3}$</tex> while the sheet resistance <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\sim 100 \mathrm{K} \Omega/\square$</tex>. The flexible pressure sensor placed in vivo or in vitro can sense both various blood pressure and heart rate. Cardiac arrhythmias such as atrial fibrillation and ventricular premature contraction can be detected in real-time. After more than 10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> cycles test, the performance of the device remains basically unchanged with fast response time less than 50 ms. The highly sensitive, small volume graphene-based Aorta pressure sensor suggests a great potential in future healthcare industry.