Abstract
Flexible electronic devices offer the capability to integrate and adapt with human body. These devices are mountable on surfaces with various shapes, which allow us to attach them to clothes or directly onto the body. This paper suggests a facile fabrication strategy via electrospinning to develop a stretchable, and sensitive poly (vinylidene fluoride) nanofibrous strain sensor for human motion monitoring. A complete characterization on the single PVDF nano fiber has been performed. The charge generated by PVDF electrospun strain sensor changes was employed as a parameter to control the finger motion of the robotic arm. As a proof of concept, we developed a smart glove with five sensors integrated into it to detect the fingers motion and transfer it to a robotic hand. Our results shows that the proposed strain sensors are able to detect tiny motion of fingers and successfully run the robotic hand.
Highlights
IntroductionWhen strain sensors were initially used to detect to measure the level of fatigue in materials
When strain sensors were initially used to detect to measure the level of fatigue in materials.Recently, flexible and wearable strain sensors have found numerous applications in high-end devices [1,2]
Some more advanced application of flexible strain sensors are body integrated electronic systems, which can be attached to the skin or clothing to measure precise strain ranging from pulse rate [4,5], heartbeat to bending of joints [6,7,8]
Summary
When strain sensors were initially used to detect to measure the level of fatigue in materials. Piezoelectric flexible strain sensors convert dynamic mechanical deformation into electrical charge due to the piezoelectric properties of the sensing element. PVDF nano fibers show a very high piezoelectric coefficient directly after electrospinning allowing us to use them in sensor applications without requiring a further polling step. PVDF is a close chemical analogue to teflon (PTFE) and, has a good chemical and moisture resistivity [19] All of these interesting properties of PVDF nanofibers make it an attractive option for development of sensitive and flexible strain sensors for human motion detection and many other applications. If the fingers bend more, the charge generated in the associated sensor is higher, and vice versa Specifications such as low-cost, low-weight, flexibility, and electrical and mechanical properties of the piezoelectric device demonstrate the high capability of these devices for developing wearable devices
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