Zinc Oxide-Enhanced Piezoelectret Polypropylene Microfiber for Mechanical Energy Harvesting

Zhu, Jianxiong; Zhu, Yali; Song, Weixing; Wang, Hui; Gao, Min; Cho, Minkyu; Park, Inkyu

doi:10.1021/acsami.8b02458

Cited by 39 publications

(28 citation statements)

References 33 publications

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“…The good agreement results verified the feasibility of our analyzed mathematical model. An RMS output voltage meant a voltage perturbation on capacitors as given in equation (11). The voltage perturbation resulted in a small number of nonlinear electrostatic forces on the movable plate.…”

Section: Mems Dual-capacitor and Mathematical Modelingmentioning

confidence: 99%

“…The principle of MEMS variable capacitive device is based on mechanical vibration to make a change of charges which in turn affects the voltage of charged capacitor [3,4]. Compared to the theory of the electromagnetic [7], the piezoelectric [8], the thermoelectric, or the triboelectric mechanism [9][10][11], the capacitive method has the advantage of easy integration with CMOS technology [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Thus, we have chosen to work with the capacitive device for both CMOS compatible and simple MEMS process fabrication [29,30].…”

Section: Introductionmentioning

confidence: 99%

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Symmetry and asymmetry from MEMS variable capacitor by nonlinear micro stoppers

Zhu

Shi

Feng

2021

Mechanics & Industry

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Mechanical stoppers in MEMS capacitive systems can dramatically affect electrical performances and result in complicated mechanical dynamic responses. This paper introduces electromechanical coupling nonlinear dynamic responses in MEMS variable dual-capacitor with an effect of nonlinear and asymmetrical stoppers. We found that the capacitance in the electrical circuit system related to the first-order derivative of the output voltage on a load resistor, and the variable dual-capacitor was strongly affected by the coupling of up and down superposition instantaneous electrostatic force and limited space by the length of nonlinear stoppers. The numerical calculation results and the experimental results in our analysis based on our system had a good agreement, and the numerical simulation results presented rich nonlinear impacts dynamic responses through the imposed voltage and the height of stoppers in MEMS variable dual-capacitive device. The device in operation cannot reach the 0.6 time's initial gap due to small forcing amplitude (1.026 g). However, we observed that the movable plate and stoppers (across the 0.6 time's initial gap) had fierce impacts due to big forcing amplitude (4 g) on to the device. With asymmetric stopper each impact, we also concluded that the movable plate would experience attenuations of the displacement until the moment to the next impacts. Moreover, the height of stoppers can not only result in complicated dynamic motion of the movable plate, but also can modulate a voltage of the fixed plate with its asymmetry structure.

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Section: Mems Dual-capacitor and Mathematical Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Symmetry and asymmetry from MEMS variable capacitor by nonlinear micro stoppers

Zhu

Shi

Feng

2021

Mechanics & Industry

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“…Polypropylene (PP) is a typical general plastic with high yield, low price, and wide application 1–3 . As far as its performance is concerned, it has good electrical insulation, chemical resistance, and processing performance 4,5 .…”

Section: Introductionmentioning

confidence: 99%

Influence of nano silica hybrid expandable graphite on flammability, thermal stability, and mechanical property of polypropylene/polyamide 6 blends

Bai

Wang

Chen

et al. 2021

J of Applied Polymer Sci

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Silica (SiO2) nanohybrid expandable graphite (nEG) particles fabricated through one‐step method are used as an efficient flame retardant for polypropylene (PP)/polyamide 6 (PA6) blends. The effect of nEG on the flammability, thermal stability, crystallization behaviors, and mechanical properties of PP/PA6 composites is investigated by using limit oxygen index (LOI), UL‐94 test, cone calorimeter test (CCT), thermogravimetric analysis, differential scanning calorimetry, Fourier transform infrared, scanning electron microscopy, and mechanical tests. Compared with pure expandable graphite (EG), nEG improves the flame retardancy of composites. The results of LOI show that LOI of PP/PA6/nEG10 and PP/PA6/nEG15 composites are 26.0% and 27.2%, respectively. But the LOI values of PP/PA6/EG10 and PP/PA6/EG15 composites are 25.7% and 26.9%, respectively. The UL‐94 test results show that PP/PA6/nEG10 composites reach V‐1 level when the nEG content is only 10%. However, the PP/PA6 composites with 10% EG does not pass the UL‐94 test. In addition, PP/PA6 composites with 15% nEG can reach V‐0 level. The CCT results further show that nEG has a higher flame‐retardant efficiency than pure EG for PP/PA6 blends. The thermal stability of PP/PA6/nEG composites is better than that of PP/PA6/EG composites. The mechanical property tests indicate that nEG is more conducive to maintain the tensile and impact strengths of PP/PA6 blends than EG due to the enhanced compatibility and interfacial adhesion.

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“…This S-TENG, which according to the analysis had a full separation of surface-to-surface, had an excellent triboelectric output performance. Zhu et al [30] introduced the microfiber-based TENG in 2018. This TENG consisted of ZnO-coated polypropylene (PP) microfibers with a spacer, and it exhibited high transfer charge and output voltage.…”

Section: Introductionmentioning

confidence: 99%

Nano- And Microfiber-Based Fully Fabric Triboelectric Nanogenerator For Wearable Devices

Bae

Song

et al. 2020

Polymers

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The combination of the triboelectric effect and static electricity as a triboelectric nanogenerator (TENG) has been extensively studied. TENGs using nanofibers have advantages such as high surface roughness, porous structure, and ease of production by electrospinning; however, their shortcomings include high-cost, limited yield, and poor mechanical properties. Microfibers are produced on mass scale at low cost; they are solvent-free, their thickness can be easily controlled, and they have relatively better mechanical properties than nanofiber webs. Herein, a nano-and micro-fiber-based TENG (NMF-TENG) was fabricated using a nylon 6 nanofiber mat and melt blown nonwoven polypropylene (PP) as triboelectric layers. Hence, the advantages of nanofibers and microfibers are maintained and mutually complemented. The NMF-TENG was manufactured by electrospinning nylon 6 on the nonwoven PP, and then attaching Ni coated fabric electrodes on the top and bottom of the triboelectric layers. The morphology, porosity, pore size distribution, and fiber diameters of the triboelectric layers were investigated. The triboelectric output performances were confirmed by controlling the pressure area and basis weight of the nonwoven PP. This study proposes a low-cost fabrication process of NMF-TENGs with high air-permeability, durability, and productivity, which makes them applicable to a variety of wearable electronics.

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Zinc Oxide-Enhanced Piezoelectret Polypropylene Microfiber for Mechanical Energy Harvesting

Cited by 39 publications

References 33 publications

Symmetry and asymmetry from MEMS variable capacitor by nonlinear micro stoppers

Symmetry and asymmetry from MEMS variable capacitor by nonlinear micro stoppers

Influence of nano silica hybrid expandable graphite on flammability, thermal stability, and mechanical property of polypropylene/polyamide 6 blends

Nano- And Microfiber-Based Fully Fabric Triboelectric Nanogenerator For Wearable Devices

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