- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[Nanostructure Science and Technology] Nanowire Electronics || Nanowires for Triboelectric Nanogenerators
摘要： Currently, the personal portable electronics are powered by traditional batteries. However, as the electronic elements and power consumption increase, the power source has become an issue because it is impractical to frequently recharge or replace the batteries. Especially, for implanted and biomedical electronic systems, to replace the power sources is unrealistic. Moreover, list of the shortcomings of the conventional power sources includes not only the limited capacity but also environmental pollution and possible explosion and health hazards. Besides, the heavy and rigid boxy batteries hinder the further development of ?exible and wearable electronics and biomedical electronics. On the other way, most of the existing sensing technologies need to be pre-supported and pre-offered electrical or optical signals to sense environmental information, which inevitably requires foreign power sources. With the increased number and density of sensing networks, the sensors that can be of low-power consumption or even self-powered will be desired for future electronic modules [1–7]. TENG was ?rst invented by Zhong Lin Wang’s group in 2012 [8]. A more and deep study and discussion about TENGs can be found in another reference book [1]. Such devices utilize the conjunction of the triboelectri?cation and electrostatic induction to convert ubiquitous mechanical energy into electricity. The devices can act as ef?cient and sustainable energy converters and providers from harvesting environment low-frequency mechanical energy, such as wind, wave, river ?ow, rain drop, human body motions, and so forth [2–6, 9]. The collected energy can be converted to electric energy sources for continuously powering electronic devices and even systems [10]. Triboelectric effect is a contact-induced electri?cation in which a material turns into electrically charged after it is physically contacted with another different kind of materials. It is a natural phenomenon, and, probably, most of the people have been experiencing the triboelectric phenomena in our daily life. However, the mechanisms and availability of triboelectri?cation were seldom to be explored [11, 12].
关键词： Flexible Electronics,Nanowires,Triboelectric Nanogenerators,Energy Harvesting,Self-powered Sensors
更新于2025-09-10 09:29:36
-
Electrically Responsive Materials and Devices Directly Driven by the High Voltage of Triboelectric Nanogenerators
摘要： Smart materials with electrically responsive characteristics and devices relying on different electrostatic effects can be directly driven by triboelectric nanogenerators (TENGs). The open circuit voltage from a TENG can easily reach thousands of volts with a separation distance of a few millimeters and this high output voltage can be used to effectively drive or control some devices with high internal resistance. This kind of combination is the most straightforward way for achieving a self-powered smart system. Hence, a detailed survey of electrically responsive materials and devices that can be successfully combined with TENG is summarized, including dielectric elastomers, piezoelectric materials, ferroelectric materials, electrostatic manipulators, electrostatic air cleaners, and field emission and mass spectrometers. Moreover, key factors in determining suitable materials or devices to work with TENG are clarified and an in-depth discussion of the current challenges related to these combined systems is provided. With the cost-effectiveness and simple manufacturing process, these TENG-based composite systems have great application prospects in the field of smart mechanics, human–machine interaction systems, intelligent storage systems, self-powered microfluidic chips, portable mass spectrometers, and so on.
关键词： piezoelectric materials,mass spectrometers,electrostatic air cleaners,dielectric elastomers,electrically responsive materials,self-powered systems,field emission,electrostatic manipulators,triboelectric nanogenerators,ferroelectric materials
更新于2025-09-10 09:29:36
-
Transcatheter Self-Powered Ultrasensitive Endocardial Pressure Sensor
摘要： Changes in endocardial pressure (EP) have important clinical significance for heart failure patients with impaired cardiac function. As a vital parameter for evaluating cardiac function, EP is commonly monitored by invasive and expensive cardiac catheterization, which is not feasible for long-term and continuous data collection. In this work, a miniaturized, flexible, and self-powered endocardial pressure sensor (SEPS) based on triboelectric nanogenerator (TENG), which is integrated with a surgical catheter for minimally invasive implantation, is reported. In a porcine model, SEPS is implanted into the left ventricle and the left atrium. The SEPS has a good response both in low- and high-pressure environments. The SEPS achieves the ultrasensitivity, real-time monitoring, and mechanical stability in vivo. An excellent linearity (R2 = 0.997) with a sensitivity of 1.195 mV mmHg?1 is obtained. Furthermore, cardiac arrhythmias such as ventricular fibrillation and ventricular premature contraction can also be detected by SEPS. The device may promote the development of miniature implantable medical sensors for monitoring and diagnosis of cardiovascular diseases.
关键词： minimally invasive,cardiovascular disease,self-powered,triboelectric nanogenerator,endocardial pressure sensor
更新于2025-09-10 09:29:36
-
Printable Fabrication of a Fully Integrated and Self-Powered Sensor System on Plastic Substrates
摘要： Wearable and portable devices with desirable flexibility, operational safety, and long cruising time, are in urgent demand for applications in wireless communications, multifunctional entertainments, personal healthcare monitoring, etc. Herein, a monolithically integrated self-powered smart sensor system with printed interconnects, printed gas sensor for ethanol and acetone detection, and printable supercapacitors and embedded solar cells as energy sources, is successfully demonstrated in a wearable wristband fashion by utilizing inkjet printing as a proof-of-concept. In such a “wearable wristband”, the harvested solar energy can either directly drive the sensor and power up a light-emitting diode as a warning signal, or can be stored in the supercapacitors in a standby mode, and the energy released from supercapacitors can compensate the intermittency of light illumination. To the best of our knowledge, the demonstration of such a self-powered sensor system integrated onto a single piece of flexible substrate in a printable and additive manner has not previously been reported. Particularly, the printable supercapacitors deliver an areal capacitance of 12.9 mF cm?2 and the printed SnO2 gas sensor shows remarkable detection sensitivity under room temperature. The printable strategies for device fabrication and system integration developed here show great potency for scalable and facile fabrication of a variety of wearable devices.
关键词： wearable and flexible devices,printable supercapacitors,printable gas sensors,monolithically integrated self-powered systems,inkjet printing
更新于2025-09-09 09:28:46
-
Solution-synthesized chiral piezoelectric selenium nanowires for wearable self-powered human-integrated monitoring
摘要： Smart sensing devices with high stretchability and self-powered characteristics are essential in future generation wearable human-integrated applications. Here we report for the first time scalable synthesis and integration of selenium (Se) nanowires into wearable piezoelectric devices, and explore the feasibility of such devices for self-powered sensing applications, e.g., physiological monitoring. The ultrathin device can be conformably worn onto the human body, effectively converting the imperceptible time-variant mechanical vibration from the human body into distinguishable electrical signals, e.g., gesture, vocal movement, and radial artery pulse, through straining the piezoelectric Se nanowires. Our results suggest the potential of solution-synthesized Se nanowire a new class of piezoelectric nanomaterial for self-powered biomedical devices and opens doors to new technologies in energy, electronics, and sensor applications.
关键词： Self-powered sensor,Selenium nanowires,Wearable electronics,Human physiological monitoring,Piezoelectric device
更新于2025-09-09 09:28:46
-
Comprehensive Pyro‐Phototronic Effect Enhanced Ultraviolet Detector with ZnO/Ag Schottky Junction
摘要： As a coupling effect of pyroelectric and photoelectric effect, pyro-phototronic effect has demonstrated an excellent tuning role for fast response p–n junction photodetectors (PDs). Here, a comprehensive pyro-phototronic effect is utilized to design and fabricate a self-powered and flexible ultraviolet PD based on the ZnO/Ag Schottky junction. By using the primary pyroelectric effect, the maximal transient photoresponsivity of the self-powered PDs can reach up to 1.25 mA W?1 for 325 nm illumination, which is improved by 1465% relative to that obtained from the steady-state signal. The relative persistent secondary pyroelectric effect weakens the height of Schottky barrier, leading to a reduction of the steady-state photocurrent with an increase in the power density. When the power density is large enough, the steady-state photocurrent turns into a reverse direction. The corresponding tuning mechanisms of the comprehensive pyro-phototronic effect on transient and steady-state photocurrent are revealed based on the bandgap diagrams. The results may help us to further clarify the mechanism of the pyro-phototronic effect on the photocurrent and also provide a potential way to optimize the performance of self-powered PDs.
关键词： ultraviolet photodetector,Schottky junction,secondary pyroelectric effect,pyro-phototronic effect,self-powered
更新于2025-09-04 15:30:14
-
Simultaneous Wireless Strain Sensing and Energy Harvesting from Multiple Piezo-Patches for Structural Health Monitoring Applications
摘要： This paper presents a novel approach called simultaneous wireless strain sensing and energy harvesting (SWSSEH) from multiple piezo-patches, which is intended for self-powered structural health monitoring (SHM) applications. The EH subsystem is mainly the self-powered extended synchronous electric charge extraction (eSECE) interface based on double cross-coupled rectifying structure and a single flyback transformer, which is able to harvest energy from multiple piezo-patches. And, the WSS subsystem is mainly the low-power multiplexing analog front end (MAFE), which is designed to process the multichannel strain signals. The innovation of the proposed approach is that energy harvesting and strain sensing can actually work simultaneously without interfering with each other. The prototype is implemented based on discrete components and tested with an emulated SHM system. Experimental results show the EH subsystem can produce 5.45 mJ energy in 100 s under 108 με and 30.4 Hz dynamic strain. The average current consumption of the WSS subsystem is 7.53 μA, and the required energy in a 100 s is 2.49 mJ, which means the system is able to self-start even if the battery is exhausted. Additionally, the self-powered capacity can be further improved in a practical SHM system since more piezo-patches can be employed.
关键词： Simultaneous energy harvesting and sensing,multiple piezo-patches,self-powered
更新于2025-09-04 15:30:14
-
[IEEE 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - Atlanta, GA, USA (2018.10.31-2018.11.2)] 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - Self-powered Gate Driver Design for a Gallium Nitride Based Phase Shifted Full Bridge DC-DC Converter for Space Applications
摘要： Radiation hardened Gallium Nitride (GaN) Field Effect Transistors (FETs) for space DC-DC converter applications have been released to the market recently. However; space qualified digital isolators with small propagation delays, fast rise and fall times, and high common mode transient immunity necessary for isolated GaN gate drivers are not currently available. In this work, a self-powered isolated GaN gate drive circuit for a Phase Shifted Full Bridge DC-DC converter for space applications is designed and tested. Signal isolation and energy transfer to bias GaN gate driver chips are achieved using pulse transformers. Operation is successfully verified in a converter using 200 V radiation hardened GaN FETs and delivering 400 W from a 100 V DC bus. Experimental results show the effects that the voltage rate of change of the switch nodes have on dead time accuracy for the top switches in the proposed implementation, and a description of how better dead time accuracy was obtained is included.
关键词： rad-hard,radiation,hardened,phase-shifted,Gallium,self-powered,pulse transformer,space,gate driver,DC-DC,GaN
更新于2025-09-04 15:30:14