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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - A Flexible 2.45 GHz Rectenna Using Electrically Small Loop Antenna
摘要： We present the concept and design of a compact flexible electromagnetic energy-harvesting system using electrically small loop antenna. In order to make the integration of the system with other devices simpler, it is designed as an integrated system in such a way that the collector element and the rectifier circuit are mounted on the same side of the substrate. The rectenna is designed and fabricated on flexible substrate, and its performance is verified through measurement for both flat and curved configurations. The DC output power and the efficiency are investigated with respect to power density and frequency. It is observed through measurements that the proposed system can achieve 72% conversion efficiency for low input power level, -11 dBm (corresponding power density 0.2 W/m2), while at the same time occupying a smaller footprint area compared to the existing work.
关键词： energy harvesting,flexible rectenna,wireless power transmission
更新于2025-09-04 15:30:14
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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
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Nanostructured Anodic Oxides: Fabrication & Applications
摘要： The special issue of Current Nanoscience entitled “Nanostructured Anodic Oxides: Fabrication & Applications” comprises review papers focused on various aspects of these nanostructures. Nanostructured anodic oxides are awaking high hopes in the research community due to the solutions of emerging problems they offer. Classically, the anodic oxides on aluminum and its alloys are a protective coating, providing improved corrosion resistance [1-5], adhesion of primer to metallic substrate [6] and hardness of the anodized surface [7-10]. However, since two-step self-organized anodization was invented in 1995, allowing to form highly-ordered honey-comb ordering of the nanopores (Fig. 1a), numerous researches have been triggered. On one hand, still new electrolytes, operating conditions and electrolyte additives are being researched, providing new ranges of the applied voltages and consequently new ranges of oxides pore diameter and interpore distance [11-17]. On the other hand, research on anodic aluminum oxide is so mature, that already significant achievements in nanofabrication [18-22] (Figs. 1b-1c), surfaces with tunable wetting angle [23-27], cells culturing platforms [28, 29], biomaterials performance [29], sensing [30, 31], structural color generation [31, 32], photocatalysis [33], renewable energy harvesting [34-36], photonic crystals [37] and plasmonic materials [38] have been reported. Moreover, also other metals are being researched. Numerous achievements in anodization of Ti [39-45] W [46], Zr [47, 48], Cu [49-51], Fe [52], Sn [53], Zn [54] and stainless steel [55] allowed to make progress in renewable energy harvesting [43, 44, 51] (especially in the assembly of dye-sensitized solar cells [44] and photoelectrochemical water splitting [43, 51]), CO2 reduction to hydrocarbons [45], drug delivery systems [41], improvement in biomaterials performance [40] and photocatalysis [46]. Moreover, also intermetallic alloys, like FeAl [56, 57] and bimetallic, layered systems like Al-Ti [58] were anodized in order to form nanoporous oxides with tunable band gap and to ease the nanofabrication, respectively.
关键词： Nanostructured Anodic Oxides,Biomaterials,Anodization,Renewable Energy Harvesting,Photocatalysis,Sensing,Fabrication,Applications,Nanofabrication
更新于2025-09-04 15:30:14
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Effect of a-Si thin film on the performance of a-Si/ZnO-stacked piezoelectric energy harvesters
摘要： In this letter, we present the fabrication and characterization of a zinc oxide (ZnO)-based nanogenerator for piezoelectric micro-energy harvesting by combining thin films of amorphous silicon (a-Si) and ZnO. We utilized the a-Si thin film as an interlayer to assemble several a-Si/ZnO-stacked piezoelectric nanogenerators (SZPNGs) on indium tin oxide (ITO)-coated polyethylene naphthalate substrates. We investigated the influence of the a-Si layer thickness on the output voltages of the SZPNGs and demonstrated the existence of an optimal a-Si thickness for maximizing the output voltage. Overall, the SZPNGs generated higher output voltages than a conventional ZnO-based piezoelectric nanogenerator (ZPNG) lacking an a-Si interlayer, indicating enhanced performance. In particular, the SZPNG based on the optimal a-Si thickness exhibited a sixfold higher output voltage compared with the conventional ZPNG. This improved performance was ascribed to a combination of the Schottky barrier at the ITO/a-Si interface, preventing the screening effect and the relatively high dielectric constant (er≈13) of a-Si, minimizing the loss of the piezoelectric potential induced in the ZnO layer. The results herein are expected to assist the development of even more advanced ZnO-based piezoelectric nanogenerators in the future.
关键词： piezoelectric energy harvesting,zinc oxide,amorphous silicon,Schottky barrier,nanogenerator
更新于2025-09-04 15:30:14
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Piezophotonics: From fundamentals and materials to applications
摘要： The piezophotonic effect is the coupling between piezoelectric properties and photoexcitation, where strain-induced piezopotential modulates and controls the relevant optical process. Specifically, metal ions as activators are capable of responding to photoexcitation and subsequent emission of light, also called mechanoluminescence, in general, and piezoluminescence specifically for piezoelectrics. These phenomena are helpful for understanding the materials fundamentals and conceiving widespread device applications. In this article, we briefly introduce the physical mechanisms of piezophotonics, including piezoluminescence. Selected host materials and metal-ion activators are described for demonstrating the piezophotonic effect. We provide a unified profile and recent prototypical demonstrations of light emission triggered by mechanical stimuli. The devices based on these materials offer the advantages of remote detection, nondestructive analysis, and repeatability, hence they are promising candidates for applications in stress sensing, structural health diagnosis, three-dimensional handwriting, magnetic-optical sensing, energy harvesting, biomedicine, novel light sources, and displays.
关键词： energy harvesting,piezoluminescence,mechanoluminescence,piezophotonics,stress sensing
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Nara, Japan (2018.10.9-2018.10.12)] 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - An Electromagnetic Energy Harvester for Extracting Rotational Energy
摘要： A micro-generator for harvesting rotational energy is proposed. By integrating conducting coils with rotational mechanism and magnets, the generator can induce electrical power through electromagnetic conversion. The output performances of the proposed generator under various rotational speeds are studied and demonstrated. The generator is expected to supply sufficient power for micro sensors, compared with typical micro-generators.
关键词： energy harvesting,rotational
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) - Singapore, Singapore (2018.4.22-2018.4.26)] 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) - Enhancement in Energy Harvesting Performances of Piezoelectric Nanogenerator by Sandwiching Electrostatic rGO Layer Between PVDF-BTO Layers
摘要： Herein the fabrication and characterizations of self-poled, tri-layer piezoelectric nanogenerators (PENGs) have been investigated. The tri-layer structure was obtained by sandwiching surface modified n-type reduced graphene oxide (n-rGO) layer between poly(vinylidene fluoride)-barium titanate (PVDF-BTO) sheets. The highly charged n-rGO layer facilitates in improving the crystallinity of PVDF by attracting and aligning the dipoles from lower and upper PVDF-BTO sheets without any external electric field. The enhancement in electro-active beta (β) phase of PVDF was also confirmed through X-ray diffraction pattern. For the comparison analysis three different, single layer (PVDF-BTO), bi-layer (n-rGO/PVDF-BTO), and tri-layer (PVDF-BTO/n-rGO/PVDF-BTO) NGs were prepared. Among them, tri-layer NG reveals maximum open circuit voltage of 10 Vpk-pk. Furthermore, it exhibits short circuit current of 2.5 μApk-pk at an applied force of 2N. Finally, the mechanical stability of fabricated NG was also tested under several pressing and releasing cycles. It was estimated that our fabricated PENG can be a promising building block for powering flexible small electronics.
关键词： energy harvesting,n-rGO,PVDF-BTO,piezoelectric nanogenerators,flexible electronics
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - A Low Power Consumption Wireless Sensor System with Wireless Power Harvesting for Oil Pipeline Monitoring
摘要： In this paper, a low power wireless sensor system for oil pipeline monitoring based on wireless energy harvesting is discussed. The system uses vibration sensor to detect the vibration state of the oil pipeline, and transmits the information to the sink node through the low power wireless sensor node which is supplied by wireless energy harvesting and rechargeable battery. Based on the introduction of the whole system construction, this paper focuses on the design of low-power wireless sensor nodes, including wireless energy harvesting, low-power wireless node circuit and low-power transmission protocol. The test results show that low power design strategy and wireless energy harvesting as energy supplement can effectively improve the practicability of the system.
关键词： wireless energy harvesting,oil pipeline monitoring,wireless sensor system,low power
更新于2025-09-04 15:30:14