Magnetic Levitation Type Double Helix Self‐Powered Acceleration Sensor Based on ZnO‐RTV Film

Abstract

In recent years, TENG has been greatly developed due to its low cost and simple production method. [8] After many scholars' research, a variety of new self-powered sensors have been developed based on TENG. [9] For example, auditory sensor, [10] gas sensor, [11] tactile sensor, [12] acceleration sensor, [13] angle sensor, [14] mechanical sensor, [15] and so on. Dai, Wang, Yi, Jiang, Li, and You [16] developed an acceleration sensor for testing the external impact force, the sensor has a large range (1.76 × 10 5 m s −2 ), but its sensitivity is low (17.64 mv (m s −2 ) −1 ). Pang, Li, Chen, Han, Zhang, and Wang [17] used polytetrafluoroethylene (PTFE) and aluminum electrodes to design a selfpowered acceleration sensor, the sensor has excellent stability, but its application is relatively single, and it is only suitable for detecting mechanical vibration. Xiang, Liu, Hao, Wang, Che, and Zhou [18] designed a flexible acceleration sensor, the sensor has high impact resistance, but its energy harvesting performance is low. The maximum open-circuit voltage (V oc ) of this sensor is only 8 mV. In addition, some self-powered acceleration sensors are relatively large in size and not suitable for installation or carrying, which limits the development of TENG-based sensors.To this end, a magnetic levitation type double helix self-powered acceleration sensor (MDHAS) is designed. The sensor's frame is composed of two double helix bases and two neodymium iron boron permanent magnets, forming a magnetic suspension double helix structure. This structure can amplify weak vibration signals, making the sensor more sensitive to external vibrations. The room temperature vulcanized silicone rubber (RTV) film doped with a certain proportion of ZnO and conductive tape is chosen as the friction material. The electrical performance of TENG can be improved by doping ZnO, thereby improving the performance of the sensor. The traditional acceleration sensor is composed of masses, dampers, elastic components, sensitive components, and adjustment circuits. In this design, the large magnet at the top of the double helix is used as the mass. The elastic force of the double helix structure and the repulsive force between the magnets act as a damper and an elastic element at the same time. The ZnO-RTV film and the conductive tape are used as sensitive components, and the output of TENG can be used to characterize acceleration. The MDHAS can not only measure the vertical vibration Traditional accelerometers rely on batteries to provide energy, and the massive use of batteries caused great pressure on the natural environment. In this paper, a self-powered acceleration sensor is designed. To more easily harvest weak vibration signals and effectively improve the sensitivity, this sensor is built on a magnetic levitation type double helix structure and ZnO-doped triboelectric film. Experiments indicated that the open-circuit voltage and short circuit current of the triboelectric nanogenerator (TENG) doped with ZnO are increased by 2.51 times and 2.07 ti...

Triboelectric Nanogenerator with a Rotational Freestanding Mode for Multi-directional Vibration Energy Harvesting

“…HNTs are abundant and naturally available aluminosilicate clay nanotubes with high mechanical strength and biocompatibility . HNTs have unique micro-spatial structure and high dielectric constant. , In addition, RTV can be cured at room temperature without long time heating, and its simple production method is conducive to large-scale promotion . Based on the two materials, the RTV-HNTs composite film with a high performance was prepared with a simple production method.…”

“…Xu et al put forward a silicone rubber-spring helical structure TENG, which can harvest the vibration energy in both vertical and horizontal directions. However, these devices have the problems of narrow frequency bandwidth and poor flexibility, and the commonly used improvement methods include impacting enhancement nonlinearity, magnetic levitation structure, membrane structure, , or placing a removable mass in the shell. , For example, Vivekananthan et al proposed a hybrid energy harvester made of magnetic particles (MP-HG). Jin et al developed the maglev porous nanogenerator, a triboelectric nanogenerator and an electromagnetic generator that can be realized simultaneously by moving up and down the middle suspension magnet.…”

Recent Progress in Sensing Technology Based on Triboelectric Nanogenerators in Dynamic Behaviors

“…The first kind is to calibrate the linear relationship between the peak value of electrical signals and the index to be tested. In the acceleration sensors in Figure 13a [100] and Figure 13b [101], the acceleration stimulated by the shaker is obtained according to the voltage peak. However, using this kind of sensor, only the peak value of the acceleration could be obtained with most of the information in the real-time responses lost.…”

A Highly Sensitive Triboelectric Quasi‐Zero Stiffness Vibration Sensor with Ultrawide Frequency Response

“…Recently, triboelectric nanogenerators (TENGs) have proven to be a simple configuration, cost-effective fabrication, and lightweight way to detect vibration. [11][12][13] In addition, most ambient triboelectric vibration sensors (TVS) are limited to a low-frequency range (below several hundred hertz). [14][15][16][17] In the low-frequency band, these sensors exhibit much higher sensitivity than vibration sensors based on other principles such as electromagnetic induction, capacitive, and optical fiber.…”