scholarly journals An Effective Self-Powered Piezoelectric Sensor for Monitoring Basketball Skills

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5144
Author(s):  
Chongle Zhao ◽  
Changjun Jia ◽  
Yongsheng Zhu ◽  
Tianming Zhao
Keyword(s):  
Control Function ◽  
Mechanical Energy ◽  
Active Material ◽  
Piezoelectric Sensor ◽  
Human Motion ◽  
Flexible Sensors ◽  
External Power ◽  
Point Control ◽  
Self Powered

Self-powered piezoelectric sensor can achieve real-time and harmless monitoring of motion processes without external power supply, which can be attached on body skin or joints to detect human motion and powered by mechanical energy. Here, a sensor for monitoring emergent motion is developed using the PVDF as active material and piezoelectric output as sensing signal. The multi-point control function enables the sensor to monitor the sequence of force order, angle change, and motion frequency of the “elbow lift, arm extension, and wrist compression” during shooting basketball. In addition, the sensor shows can simultaneously charge the capacitor to provide more power for intelligence, typically Bluetooth transmission. The sensor shows good performance in other field, such as rehabilitation monitoring and speech input systems. Therefore, the emerging application of flexible sensors have huge long-term prospects in sport big data collection and Internet of Things (IoT).

scholarly journals Recent Advances in Self-Powered Electrochemical Systems

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Linglin Zhou ◽  
Di Liu ◽  
Li Liu ◽  
Lixia He ◽  
Xia Cao ◽  
...  
Keyword(s):  
Mechanical Energy ◽  
Power Source ◽  
Triboelectric Nanogenerator ◽  
Application Domain ◽  
Important Research ◽  
Electrochemical System ◽  
Electrochemical Systems ◽  
External Power Source ◽  
External Power ◽  
Self Powered

Electrochemistry, one of the most important research and production technology, has been widely applicated in various fields. However, the requirement of external power source is a major challenge to its development. To solve this issue, developing self-powered electrochemical system (SPES) that can work by collecting energy from the environment is highly desired. The invention of triboelectric nanogenerator (TENG), which can transform mechanical energy into electricity, is a promising approach to build SPES by integrating with electrochemistry. In this view, the latest representative achievements of SPES based on TENG are comprehensively reviewed. By harvesting various mechanical energy, five SPESs are built, including electrochemical pollutants treatment, electrochemical synthesis, electrochemical sensor, electrochromic reaction, and anticorrosion system, according to the application domain. Additionally, the perspective for promoting the development of SPES is discussed.

Human Motion Driven Self-Powered Photodynamic System for Long-Term Autonomous Cancer Therapy

ACS Nano ◽  
2020 ◽  
Vol 14 (7) ◽  
pp. 8074-8083 ◽  
Author(s):  
Zhuo Liu ◽  
Lingling Xu ◽  
Qiang Zheng ◽  
Yong Kang ◽  
Bojing Shi ◽  
...  
Keyword(s):  
Cancer Therapy ◽  
Human Motion ◽  
Self Powered

Triboelectric nanogenerators as new energy technology and self-powered sensors – Principles, problems and perspectives

2014 ◽  
Vol 176 ◽  
pp. 447-458 ◽  
Author(s):  
Zhong Lin Wang
Keyword(s):  
Energy Harvesting ◽  
Charge Density ◽  
Energy Conversion ◽  
Daily Life ◽  
Mechanical Energy ◽  
Ocean Waves ◽  
Human Motion ◽  
Triboelectric Nanogenerator ◽  
Standard Material ◽  
Self Powered

Triboelectrification is one of the most common effects in our daily life, but it is usually taken as a negative effect with very limited positive applications. Here, we invented a triboelectric nanogenerator (TENG) based on organic materials that is used to convert mechanical energy into electricity. The TENG is based on the conjunction of triboelectrification and electrostatic induction, and it utilizes the most common materials available in our daily life, such as papers, fabrics, PTFE, PDMS, Al, PVCetc.In this short review, we first introduce the four most fundamental modes of TENG, based on which a range of applications have been demonstrated. The area power density reaches 1200 W m−2, volume density reaches 490 kW m−3, and an energy conversion efficiency of ∼50–85% has been demonstrated. The TENG can be applied to harvest all kinds of mechanical energy that is available in our daily life, such as human motion, walking, vibration, mechanical triggering, rotation energy, wind, a moving automobile, flowing water, rain drops, tide and ocean waves. Therefore, it is a new paradigm for energy harvesting. Furthermore, TENG can be a sensor that directly converts a mechanical triggering into a self-generated electric signal for detection of motion, vibration, mechanical stimuli, physical touching, and biological movement. After a summary of TENG for micro-scale energy harvesting, mega-scale energy harvesting, and self-powered systems, we will present a set of questions that need to be discussed and explored for applications of the TENG. Lastly, since the energy conversion efficiencies for each mode can be different although the materials are the same, depending on the triggering conditions and design geometry. But one common factor that determines the performance of all the TENGs is the charge density on the two surfaces, the saturation value of which may independent of the triggering configurations of the TENG. Therefore, the triboelectric charge density or the relative charge density in reference to a standard material (such as polytetrafluoroethylene (PTFE)) can be taken as a measuring matrix for characterizing the performance of the material for the TENG.

scholarly journals A Self-Powered Portable Flexible Sensor of Monitoring Speed Skating Techniques

Biosensors ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 108
Author(s):  
Zhuo Lu ◽  
Yongsheng Zhu ◽  
Changjun Jia ◽  
Tianming Zhao ◽  
Meiyue Bian ◽  
...  
Keyword(s):  
Big Data ◽  
Polyvinylidene Fluoride ◽  
Flexible Sensors ◽  
Flexible Sensor ◽  
User Training ◽  
Speed Skating ◽  
Sport Industry ◽  
Sensor Signals ◽  
External Power ◽  
Self Powered

With the development of 5G technology, contemporary technologies such as Internet of Things (IoT) and Big Data analyses have been widely applied to the sport industry. This paper focuses on the design of a portable, self-powered, flexible sensor, which does not require an external power supply. The sensor is capable of monitoring speed skating techniques, thereby helping professional athletes to enhance their performance. This sensor mainly consists of Polyvinylidene Fluoride (PVDF) with polarization after a silvering electrode and a flexible polyester substrate. Flexible sensors are attached to the push-off joint part of speed skaters and the ice skate blade. During motion, it produces different piezoelectricity signals depending on the states of motion. The monitoring and analyzing of the real-time sensor signals will adjust the athlete’s skating angle, frequency, and push-off techniques, thus improving user training and enhancing performance. Moreover, the production of piezoelectric signals can charge the capacitor, provide power for small electronic equipment (e.g., wireless device), and extend the applications of wearable flexible sensors to the Big Data and IoT technologies in the sport industry.

Diffusion Controlled, Water-Powered Microactuator for Biomedical and Microfluidic Applications

2007 ◽  
Author(s):  
Asheesh Divetia ◽  
Baruch D. Kuppermann ◽  
Guann-Pyng Li ◽  
Mark Bachman
Keyword(s):  
Drug Delivery ◽  
Micro Electro Mechanical Systems ◽  
Permeable Membrane ◽  
Diffusion Controlled ◽  
External Power ◽  
Selective Diffusion ◽  
Self Powered ◽  
Implantable Biomedical Devices ◽  
Mechanical Actuation

Current and advanced microfluidic and implantable biomedical devices present an increasing need for controlled mechanical actuation at the micro-scale, without the use of batteries or external power. Implantable applications such as drug delivery microdevices require long term, battery free operation to perform their operation over the course of many months or years. In this paper, we present a micro-electro-mechanical systems (MEMS) microactuator which is water-powered and does not require any external power or control for its operation. Furthermore, we have demonstrated that by controlling the diffusion of water through a lithographically defined semi-permeable membrane, we can control the rate of this mechanical actuation. The microactuator uses a water-swellable polymer as the working agent and a thin membrane of PDMS (polydimethylsiloxane) as the semi-permeable membrane to allow selective diffusion of water into the actuator. The swelling of the polymer upon contact with water and the resulting pressure generated is used as the actuation mechanism. Self-powered microactuators that use this technology can be important for many microfluidic and biomedical applications such as pulsatile drug delivery.

scholarly journals Wearable Woven Triboelectric Nanogenerator Utilizing Electrospun PVDF Nanofibers for Mechanical Energy Harvesting

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 438 ◽  
Author(s):  
Muhammad Omar Shaikh ◽  
Yu-Bin Huang ◽  
Cheng-Chien Wang ◽  
Cheng-Hsin Chuang
Keyword(s):  
Polyvinylidene Fluoride ◽  
Mechanical Energy ◽  
Wearable Devices ◽  
Human Motion ◽  
Triboelectric Nanogenerator ◽  
Free Standing ◽  
Β Phase ◽  
Applied Forces ◽  
Self Powered ◽  
High Output Voltage

Several wearable devices have already been commercialized and are likely to open up a new life pattern for consumers. However, the limited energy capacity and lifetime have made batteries the bottleneck in wearable technology. Thus, there have been growing efforts in the area of self-powered wearables that harvest ambient mechanical energy directly from surroundings. Herein, we demonstrate a woven triboelectric nanogenerator (WTENG) utilizing electrospun Polyvinylidene fluoride (PVDF) nanofibers and commercial nylon cloth to effectively harvest mechanical energy from human motion. The PVDF nanofibers were fabricated using a highly scalable multi-nozzle far-field centrifugal electrospinning protocol. We have also doped the PVDF nanofibers with small amounts of multi-walled carbon nanotubes (MWCNT) to improve their triboelectric performance by facilitating the growth of crystalline β-phase with a high net dipole moment that results in enhanced surface charge density during contact electrification. The electrical output of the WTENG was characterized under a range of applied forces and frequencies. The WTENG can be triggered by various free-standing triboelectric layers and reaches a high output voltage and current of about 14 V and 0.7 µA, respectively, for the size dimensions 6 × 6 cm. To demonstrate the potential applications and feasibility for harvesting energy from human motion, we have integrated the WTENG into human clothing and as a floor mat (or potential energy generating shoe). The proposed triboelectric nanogenerator (TENG) shows promise for a range of power generation applications and self-powered wearable devices.

A high-output triboelectric nanogenerator based on nickel–copper bimetallic hydroxide nanowrinkles for self-powered wearable electronics

2020 ◽  
Vol 8 (48) ◽  
pp. 25995-26003
Author(s):  
Kequan Xia ◽  
Di Wu ◽  
Jiangming Fu ◽  
Nur Amin Hoque ◽  
Ying Ye ◽  
...  
Keyword(s):  
Mechanical Energy ◽  
Human Motion ◽  
Triboelectric Nanogenerator ◽  
Wearable Electronics ◽  
Nickel Copper ◽  
Self Powered ◽  
High Output

This study provides a novel wearable TENG based on nickel–copper bimetallic hydroxide nanowrinkles (NC-TENG) to harvest the mechanical energy from human motion.

A Compact Human-Powered Energy Harvesting System

2014 ◽  
Vol 1 (1-2) ◽  
Author(s):  
Yuan Rao ◽  
Kelly M. McEachern ◽  
David P. Arnold
Keyword(s):  
Energy Harvesting ◽  
Electrical Energy ◽  
Human Motion ◽  
Dc Voltage ◽  
External Power ◽  
Energy Harvesting System ◽  
Li Ion ◽  
Human Powered ◽  
Polymer Battery

AbstractA fully functional, self-sufficient body-worn energy harvesting system is presented in this paper. The system is designed for passively capturing energy from human motion, with the long-term vision of supplying power to portable, wearable, or even implanted electronic devices. Compared with state-of-the-art vibrational systems, the system requires no external power supplies and can bootstrap from zero-state-of-charge to generate electrical energy from walking, jogging, and cycling; convert the induced AC voltage to DC voltage; and then boost and regulate the DC voltage to charge a Li-ion-polymer battery. Measurements show that at open-load the system turns on when the input is above 1 V

scholarly journals A Tubular Flexible Triboelectric Nanogenerator with a Superhydrophobic Surface for Human Motion Detecting

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3634
Author(s):  
Jianwei Wang ◽  
Zhizhen Zhao ◽  
Xiangwen Zeng ◽  
Xiyu Liu ◽  
Youfan Hu
Keyword(s):  
Energy Harvesting ◽  
Flexible Electronics ◽  
Superhydrophobic Surface ◽  
Mechanical Energy ◽  
Construction Material ◽  
Human Motion ◽  
Triboelectric Nanogenerator ◽  
Free Standing ◽  
Self Powered ◽  
Human Motion Monitoring

The triboelectric nanogenerator (TENG) is a newly arisen technology for mechanical energy harvesting from the environment, such as raindrops, wind, tides, and so on. It has attracted widespread attention in flexible electronics to serve as self-powered sensors and energy-harvesting devices because of its flexibility, durability, adaptability, and multi-functionalities. In this work, we fabricated a tubular flexible triboelectric nanogenerator (TF-TENG) with energy harvesting and human motion monitoring capabilities by employing polydimethylsiloxane (PDMS) as construction material, and fluorinated ethylene propylene (FEP) films coated with Cu as the triboelectric layer and electrode, serving in a free-standing mode. The tube structure has excellent stretchability that can be stretched up to 400%. Modifying the FEP films to obtain a superhydrophobic surface, the output performance of TF-TENG was increased by at least 100% compared to an untreated one. Finally, as the output of TF-TENG is sensitive to swing angle and frequency, demonstration of real-time monitoring of human motion state was realized when a TF-TENG was worn on the wrist.

scholarly journals A Flexible Piezoelectric Energy Harvester-Based Single-Layer WS2 Nanometer 2D Material for Self-Powered Sensors

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2097
Author(s):  
Quan Wang ◽  
Kyung-Bum Kim ◽  
Sang Bum Woo ◽  
Yoo Seob Song ◽  
Tae Hyun Sung
Keyword(s):  
Signal To Noise Ratio ◽  
Single Layer ◽  
High Sensitivity ◽  
Human Movement ◽  
Piezoelectric Sensor ◽  
Human Motion ◽  
High Signal ◽  
Human Machine Interaction ◽  
Piezoelectric Energy ◽  
Self Powered

A piezoelectric sensor is a typical self-powered sensor. With the advantages of a high sensitivity, high frequency band, high signal-to-noise ratio, simple structure, light weight, and reliable operation, it has gradually been applied to the field of smart wearable devices. Here, we first report a flexible piezoelectric sensor (FPS) based on tungsten disulfide (WS2) monolayers that generate electricity when subjected to human movement. The generator maximum voltage was 2.26 V, and the produced energy was 55.45 μJ of the electrical charge on the capacitor (capacity: 220 μF) when applying periodic pressing by 13 kg. The generator demonstrated here can meet the requirements of human motion energy because it generates an average voltage of 7.74 V (a knee), 8.7 V (a sole), and 4.58 V (an elbow) when used on a running human (weight: 75 kg). Output voltages embody distinct patterns for different human parts, the movement-recognition capability of the cellphone application. This generator is quite promising for smart sensors in human–machine interaction detecting personal movement.

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