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A Low Frequency Vibration Energy Harvester Using ZnO Nanowires on Elastic Interdigitated Electrodes
摘要： This paper presents a low frequency piezoelectric vibration energy harvester using ZnO nanowires on elastic interdigitated electrodes. The interdigitated electrodes are formed using electroplated Ni and have suspended parts at the edges that are elastic and deformable by applying external force. A spherical Ni ball is used as a proof mass, which transforms a low frequency mechanical vibration into the force applied to deform the elastic electrodes. The ZnO nanowires are grown selectively on the electrodes and can generate a piezoelectric potential when the elastic electrodes are deformed by the proof mass activated by the external mechanical vibration. The proposed operation concept is demonstrated using two different types of energy harvesters, which have simple suspended part and cantilever array structures added to the electrodes, respectively. The output voltage of the fabricated harvesters is measured using a vibration exciter at 6 Hz sinusoidal vibration with an acceleration of 0.5 g. Maximum output power of 12.8 pW and 18.8 pW was generated with a load resistance of 1 MΩ for the harvesters using the simple suspended structure and cantilever array, respectively.
关键词： Spherical Proof Mass,Elastic Interdigitated Electrodes,ZnO Nanowires,Low Frequency Piezoelectric Vibration Energy Harvester
更新于2025-09-23 15:23:52
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Effect of post-annealing on microstructure and piezoelectric properties of ZnO thin film for triangular shaped vibration energy harvester
摘要： In this paper, a triangular shaped piezoelectric vibration energy harvester (TS-PVEH) with zinc oxide (ZnO) thin films as the piezoelectric layer is reported. The effect of post-annealing temperature on the microstructure and piezoelectric performance of ZnO thin film deposited by magnetron sputtering method is investigated firstly. The results show that the optimum post-annealing temperature of 150 °C was the most beneficial to improve the piezoelectric properties of ZnO thin films. Four prototypes of TS-PVEH with different structure parameters are fabricated and optimized. The simulation and experiment results indicate that the height and width of the triangular structure have a significant influence on the vibration mode and the output performance of TS-PVEHs. The optimization results indicate that the third prototype has the best output performance. Its open-circuit voltage and short-circuit current are 290mV and 1.25 μA, respectively, when the vibration acceleration is 5m/s2 and the frequency is 56Hz. Moreover, it has the highest load power density of 0.035μW/cm2 when the load is 0.1MΩ.
关键词： Triangular substrate,ZnO thin film,Structure optimization,Post-annealing temperature,Vibration energy harvester
更新于2025-09-23 15:23:52
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A distributed parametric model of Brinson shape memory alloy based resonant frequency tunable cantilevered PZT energy harvester
摘要： This paper presents, an analytical model of piezoelectric vibration energy harvester consists of Brinson shape memory alloy (SMA) plate which can tune the resonant frequency. As the energy harvester should be tuned to excitation frequency in order to drive the maximum power, the temperature of SMA is varied to tune the natural frequency of the composite beam. In addition to SMA it also consists of piezoelectric layer and substructure layer. Using Euler–Bernoulli beam assumption, the expressions for frequency response of voltage, current and power outputs with temperature are obtained. From parametric study, it is observed that the tuning of natural frequency is 25–26%, for first three modes of vibration in short and open circuit conditions.
关键词： PZT,Energy harvester,Shape memory alloy,Tunable,Cantilever
更新于2025-09-23 15:22:29
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[ASME ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems - San Antonio, Texas, USA (Monday 10 September 2018)] Volume 2: Mechanics and Behavior of Active Materials; Structural Health Monitoring; Bioinspired Smart Materials and Systems; Energy Harvesting; Emerging Technologies - Nonlinear Dynamics of a Special Piezoelectric Energy Harvester With a Special Bistable Piezoelectric Cantilever Beam
摘要： This paper presents a special piezoelectric energy harvester system which is obtained by separating the end of the upper piezoelectric layer of the traditional piezoelectric cantilever beam from its basic layer. A mass I is located at the end of the separated upper piezoelectric layer (SUPL), a mass II and a permanent magnet I are located at the end of the separated lower piezoelectric beam (SLPB) and a permanent magnet II is added in the opposite position of the permanent magnet I and they face each other with same polarities. A nonlinear magnetic force which can broaden the frequency bandwidth of the system is generated mutually on the two permanent magnets. Studies find that this special piezoelectric energy harvester has extremely high energy capture efficiency. In order to further explore the reason of high efficiency, experimental research on its dynamic behavior is carried out. The experimental results show that the vibrations of the SUPL and the SLPB are relatively simple. The dynamic behaviors of the SUPL, the SLPB and the unseparated part are different. The unseparated part of the piezoelectric relatively complex nonlinear phenomenon due to the interaction of nonlinear magnetic force and the collision. With the increase of the external excitation frequency, period doubling motion and almost periodic motion appear alternately.
关键词： nonlinear magnetic force,dynamic behavior,energy harvester,frequency bandwidth
更新于2025-09-23 15:21:01
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Towards truly wearable energy harvesters with full structural integrity of fiber materials
摘要： Through full flexible realization of a new energy harvesting mode using only common fiber materials as active components by adopting a computerized knitting programme strategy, herein we developed a new kind of all-textile energy harvesters (A-TEHs) with a three-dimensional fabric structural integrity that can harvest and convert mechanical energy to electricity directly. The electric performance of obtained A-TEHs working at a single-electrode mode was extraordinary, which can generate a maximum power density of 1768.2 mW m?2 by 1200 N at a matched resistance load of 50 MΩ, and directly light up over 320 LEDs instantaneously by a single impact with an effective area of only 56.7 cm2. When A-TEH was used to charge a 200 μF commercial capacitor storage device with a bridge rectifier, its charging capacity increased with the triggering force, ranging from 6.7 mV s?1 at 100 N to 11.3 mV s?1 at 1400 N. Benefiting from the full structural integrity of fiber materials, A-TEHs, for the first time, truly realized the excellent textile properties that all wearable electronics try to achieve, including safety, lightweight, comfort, breathability, washability, and unique advantage of tailorability, leading to a kind of truly wearable energy harvesters with versatile product designability.
关键词： Energy harvester,True wearability,Fiber assemblies,Fabric structural integrity,Full textile properties
更新于2025-09-19 17:15:36
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Experimental Realization of a Quantum Dot Energy Harvester
摘要： We demonstrate experimentally an autonomous nanoscale energy harvester that utilizes the physics of resonant tunneling quantum dots. Gate-defined quantum dots on GaAs=AlGaAs high-electron-mobility transistors are placed on either side of a hot-electron reservoir. The discrete energy levels of the quantum dots are tuned to be aligned with low energy electrons on one side and high energy electrons on the other side of the hot reservoir. The quantum dots thus act as energy filters and allow for the conversion of heat from the cavity into electrical power. Our energy harvester, measured at an estimated base temperature of 75 mK in a He3=He4 dilution refrigerator, can generate a thermal power of 0.13 fW for a temperature difference across each dot of about 67 mK.
关键词： resonant tunneling,quantum dots,thermoelectric,energy harvester,nanoscale
更新于2025-09-11 14:15:04
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[IEEE 2018 IEEE 2nd International Conference on Dielectrics (ICD) - Budapest (2018.7.1-2018.7.5)] 2018 IEEE 2nd International Conference on Dielectrics (ICD) - Vibration energy harvesting with stretchable electrets
摘要： Motivated by the demand for self-powered portable wearable electronics systems and self-actuated wireless sensors, the development of the energy harvesters that can convert ambient energy into electricity is of great interest. In this study, we fabricated energy harvesters based on stretchable wave-shaped fluorinated ethylene propylene (FEP) electret films using a predesigned bi-stable structure. The energy harvesting performance of the devices with a length of 30 mm and a width of 10 mm was investigated in a stretching mode at various exciting frequencies, load resistances, seismic masses and surface potentials of FEP electrets films. Using 12.5 μm thick wavy FEP electrets with a surface potential of -500 V and a seismic mass of 3 g cemented on the center of the harvester, the generated power across the optimal load resistance amounts to 355 μW at 22 Hz for an input acceleration of 1 g. (g is the gravity of the earth).
关键词： electrostatic energy harvester,wavy structure,stretchable FEP electret films
更新于2025-09-10 09:29:36
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Light-Harvesting CMOS Power-Supply System for 0–10-mW Wireless Microsensors
摘要： Wireless microsensors in consumer products, homes, hospitals, and factories incorporate sensing, processing, and transmission intelligence that can save money, energy, and lives. Although their tiny batteries deplete quickly, harvesting light energy can replenish what they supply. Still, a 1-mm2 PV cell can only generate up to 150 μW of the mW's that a wireless microsensor can consume. The battery-assisted light-powered harvester presented here therefore draws 10–130 μW from a 1 × 1-mm2 PV cell and assistance from a battery to supply a 10-mW load and recharge the battery with excess PV power. The CMOS system regulates its 1-V output within ±28 mV while supplying 10× more power per 1 mm3 with 94.5% efficiency and 38× with 87.8% efficiency than the best light-harvesting microsystem reported. Unlike others whose efficiencies peak at one power level, efficiency here is 94.5% across vPV's 10–130-μW and PLD's 0.5–10-mW with a 18-μH 3 × 3 × 1.5-mm3 inductor and 87.8% with a 22-μH 1.6 × 0.8 × 0.8-mm3 device.
关键词： Ambient light,switched-inductor converter,wireless microsensor,energy harvester,power supply,photovoltaic (PV) cell,CMOS microsystem,charger
更新于2025-09-10 09:29:36
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Flexible piezoelectric ultrasonic energy harvester array for bio-implantable wireless generator
摘要： Ultrasonic driven wireless charging technology has recently attracted much attention in the next generation bio-implantable systems; however, most developed ultrasonic energy harvesters are bulky and rigid and cannot be applied to general complex surfaces. Here, a flexible piezoelectric ultrasonic energy harvester (PUEH) array was designed and fabricated by integrating a large number of piezoelectric active elements with multilayered flexible electrodes in an elastomer membrane. The developed flexible PUEH device can be driven by the ultrasonic wave to produce continuous voltage and current outputs on both planar and curved surfaces, reaching output signals of more than 2 Vpp and 4 μA, respectively. Potential applications of using the flexible PUEH to charge energy-storage devices and power commercial electronics were demonstrated. Its low attenuation performance was also evaluated using the in vitro test of transmitting power through pork tissue, demonstrating its potential use in the next generation of wirelessly powered bio-implantable micro-devices.
关键词： piezoelectric,ultrasonic energy harvester,wireless generator.,flexible device
更新于2025-09-10 09:29:36
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Performance of PVDF/TiO<SUB align="right">2 nano-composite film in the application of energy harvester
摘要： The compression mode and shear mode for energy harvesting experimental platform was estabished. The energy collection efficiency of PVDF/TiO2 nano-composite film in the two mode and nonlinear piezoelectric effect were analysed. Experimental results show that the energy collection efficiency of the shear mode was higher than the compressed mode. The Piezoelectric constant and piezoelectric coupling coefficient have nonlinear changes under large stress. In this paper, the experimental data establish a relationship electromechanical coupling coefficients and parameters of composite thin film piezoelectric stress.
关键词： nano-composite film,PVDF,TiO2,energy harvester
更新于2025-09-10 09:29:36