Hybrid nano-textured nanogenerator and self-powered sensor for on-skin triggered biomechanical motions

Abstract

Researchers have made a lot of effort for the lightweight and high flexibility of wearable electronic devices, which also requires the associated energy harvesting equipment to have ultra-thin thickness and high stretchability. Therefore, a piezoelectric-triboelectric hybrid self-powered sensor (PTHS) has been proposed which can be used as the second layer of the human body. This elastic PTHS can even work on a person’s fingers without disturbing the body’s movements. The open circuit voltage and short circuit current of devices with a projected area of 30 mm × 25 mm can reach 1.2 V and 30 nA, respectively. Two piezoelectrically-triboelectrically sensors with machine learning optimized identification strategies were experimentally proven as the potential applications of the PTHS. The PTHS’s ultra-thin thickness, high stretchability and superior geometry control features are promising in electronic skin, artificial muscle and soft robotics. The novelty of this work is that a smart mask integrated with PTHS can generate a signal of the hybrid sensor for the biomechanical motion classifier. After suitable training, an overall accuracy of 87.9% using long short-term memory can be achieved.

Progress inTENGtechnology—A journey from energy harvesting to nanoenergy and nanosystem

“…Polyvinylidene fluoride (PVDF), being a polymer with piezoelectric properties, is the most popular material for hybrid PE‐TENGs since it allows for flexibility, which is a desirable property for applications such as wearable sensors and energy harvesters. PE‐TENG motion sensors using PVDF fibers as only the piezoelectric layer or as both the piezoelectric layer and triboelectric contact surface have been reported, along with vibration sensors and nanogenerators made with polarized PVDF film and PVDF nanoparticles 275,289‐293 . One eloquent example of the polyvalence of PVDF is displayed in Figure 11B.…”

“…PE-TENG motion sensors using PVDF fibers as only the piezoelectric layer or as both the piezoelectric layer and triboelectric contact surface have been reported, along with vibration sensors and nanogenerators made with polarized PVDF film and PVDF nanoparticles. 275,[289][290][291][292][293] One eloquent example of the polyvalence of PVDF is displayed in Figure 11B. A flappingblade wind energy harvester with TENG integrated winglike outer frame oscillates up and down, following the vortices created by the wind perturbations.…”

Self‐Powered Gesture Recognition Wristband Enabled by Machine Learning for Full Keyboard and Multicommand Input

“…The second issue is the energy consumption of sensors. [35][36][37] Existing sensors often require an excitation voltage as power supply. The active sensors employed in the GRW do not require excitation voltage.…”

Flexible and environment-friendly regenerated cellulose/MoS2 nanosheet nanogenerators with high piezoelectricity and output performance

“…Besides, the converse piezoelectric effect is that the material deforms under electric stimulation (Wei et al 2018). Energy harvesting technology inspired by piezoelectric effect can be used in nanogenerator (Ye et al 2019), selfpowered sensor and so on (Fang et al 2019). The devices could convert mechanical energy from human daily life such as walking, bending at anytime and anywhere to achieve the purpose of energy utilization (Yang et al 2016;Xu et al 2010).…”