High-output acoustoelectric power generators from poly(vinylidenefluoride-co-trifluoroethylene) electrospun nano-nonwovens

Lang, Chenhong; Fang, J.; Shao, Huili; Wang, Hongxia; Yan, Guilong; Ding, Xin; Lin, Tong

doi:10.1016/j.nanoen.2017.03.038

Cited by 71 publications

(37 citation statements)

References 19 publications

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“…Among these, α-phase (TGTG0 conformation) is not electroactive, and β-phase has the strongest piezoelectricity. PVDF with a low component of β-phase has a d33 value of approximately 20-30 pC/N [44][45][46][47][48][49][50][51]. Therefore, increasing the β-phase PVDF composition is vital to enlarge the mechanicalelectrical energy conversion performance of PVDF.…”

Section: Piezoelectric Materials Based On Pvdf and Its Derivativesmentioning

confidence: 99%

“…In sensing applications, flexible and wearable pressure sensors are made of piezoelectric polymer materials with flexible characteristics. High-voltage electrospinning can be used to fabricate PVDF piezoelectric nanofiber films [51,[145][146][147][148][149]. Gong et al [134] combined the PVDF nanofiber membrane by electrospinning with PDMS-Ag NWS and PET/ITO electrodes to fabricate sensors (Figure 11a) [134].…”

Section: Physical Sensorsmentioning

confidence: 99%

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Composites, Fabrication and Application of Polyvinylidene Fluoride for Flexible Electromechanical Devices: A Review

Guo

Duan

Xie

et al. 2020

Preprint

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The technological development of piezoelectric materials is crucial for developing wearable and flexible electromechanical devices. There are many inorganic materials with piezoelectric effects, such as piezoelectric ceramics, aluminum nitride, and zinc oxide. They all have very high piezoelectric coefficients and large piezoelectric response ranges. The characteristics of high hardness and low tenacity make inorganic piezoelectric materials unsuitable for flexible devices that require frequent bending. Polyvinylidene fluoride (PVDF) and its derivatives are the most popular materials used in flexible electromechanical devices in recent years and have high flexibility, high sensitivity, high ductility, and a certain piezoelectric coefficient. Owing to increasing the piezoelectric coefficient of PVDF, researchers are committed to optimizing PVDF materials and enhancing their polarity by a series of means to further improve their mechanical–electrical conversion efficiency. This paper reviews the latest PVDF-related optimization materials, related processing and polarization methods, and the applications of these materials such as those in wearable functional devices, chemical sensors, biosensors, and flexible actuator devices for flexible micro-electromechanical devices. We also discuss the challenges of wearable devices based on flexible piezoelectric polymer, consider where further practical applications could be.

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Section: Piezoelectric Materials Based On Pvdf and Its Derivativesmentioning

confidence: 99%

Section: Physical Sensorsmentioning

confidence: 99%

Composites, Fabrication and Application of Polyvinylidene Fluoride for Flexible Electromechanical Devices: A Review

Guo

Duan

Xie

et al. 2020

Preprint

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“…In addition, voice user interface (VUI) has attracted significant attention as the core technology of internet of things (IoT) artificial intelligence (AI) due to its exceptionally convenient and bilateral communication . Smart acoustic sensors can be applied to speaker recognition, biometrics, personalized AI secretary, and smart home appliances …”

Section: Introductionmentioning

confidence: 99%

Flexible Piezoelectric Acoustic Sensors and Machine Learning for Speech Processing

et al. 2019

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Flexible piezoelectric acoustic sensors have been developed to generate multiple sound signals with high sensitivity, shifting the paradigm of future voice technologies. Speech recognition based on advanced acoustic sensors and optimized machine learning software will play an innovative interface for artificial intelligence (AI) services. Collaboration and novel approaches between both smart sensors and speech algorithms should be attempted to realize a hyperconnected society, which can offer personalized services such as biometric authentication, AI secretaries, and home appliances. Here, representative developments in speech recognition are reviewed in terms of flexible piezoelectric materials, self‐powered sensors, machine learning algorithms, and speaker recognition.

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“…[1][2][3][4][5][6][7] However, most of the existing mechanical energy-to-electricity conversion devices generate alternating current (AC) outputs, which have to be rectified into direct current (DC) power prior to storage or use. Conversion of these tiny kinetic energies into electricity offers novel applications in the fields of sensors and power supply.…”

Section: Introductionmentioning

confidence: 99%

Doping Effect on Conducting Polymer‐Metal Schottky DC Generators

Shao

Fang

Wang

et al. 2018

Adv Elect Materials

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nitride (InN) nanowire energy harvesters [8][9][10][11][12][13][14] ; 2) triboelectric-based generators with multiple electrification pairs or a sliding Schottky nanocontact [15][16][17] ; 3) conducting polymer-metal Schottky diodes. [18,19] In our previous studies, we have demonstrated that a conducting polymer film when forming a Schottky contact with a metal (such as Al or Al alloy) can produce DC outputs under compressive deformations. [18,19] The devices showed a large energy density. They are easy to fabricate, offering great potential for applications in various self-powered electronic devices.Polyaniline (PANI) is a major conducting polymer possessing high conductivity and processing ability. [20] It has shown vast application potential in the fields of supercapacitors, batteries, sensors, EMI shielding, and gas separation. [21][22][23] PANI can be easily doped and de-doped. The dopant and doping state have a great effect on the electrical properties of PANI. [24] For example, PANI emeraldine base (PANI-EB), i.e., non-doped PANI, is almost nonconductive with an electrical resistivity as high as 10 10 Ω cm −1 . [25] The conductivity is largely enhanced when doped with a protonic acid. [26] The dopant effect was attributed to the change of PANI crystallinity, interchain distance, and energy bandgap, hence leading to change in chemical and physical properties (e.g., electrochemical, spectroscopic, and modulus). [24,27,28] However, how dopant affects the energy conversion property of PANI-metal Schottky diodes has not been reported in research literature.In this study, we have for the first time demonstrated the effect of dopants on the mechanical-to-electrical energy conversion behavior of a conducting polymer-metal Schottky power generator. PANI was used as a conducting polymer model, which was doped with four protonic acids; orthophosphoric acid (H 3 PO 4 ), sulfuric acid (H 2 SO 4 ), perchloric acid (HClO 4 ), and hydrochloric acid (HCl). The dopants showed a great effect on energy conversion property. The device made of nondoped PANI only produced up to 1.5 mV and 0.55 nA cm −2 electrical outputs. The one from HCl-doped PANI generated much higher outputs (0.9 V and 33.9 µA cm −2 ) than those from PANI doped with other protonic acids. The change in electrical outputs was attributed to the effect of dopant on barrier height and conductivity. For Al/PANI-HCl/Au, the barrier height decreased significantly from 0.87 to 0.78 eV when the Conducting polymer-metal Schottky diodes show an interesting mechanical energy-to-electricity conversion ability to generate direct current (DC) power without rectification. However, little is reported about how dopants in conducting polymer affect the energy conversion behavior of Schottky diodes. In this study, a novel effect of dopants on mechanical energy-to-DC electricity conversion of conducting polymer-metal Schottky devices is demonstrated. Using polyaniline (PANI) as a model, conducting polymers doped with a series of protonic acids is prepared. Without dopant, the dev...

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High-output acoustoelectric power generators from poly(vinylidenefluoride-co-trifluoroethylene) electrospun nano-nonwovens

Cited by 71 publications

References 19 publications

Composites, Fabrication and Application of Polyvinylidene Fluoride for Flexible Electromechanical Devices: A Review

Composites, Fabrication and Application of Polyvinylidene Fluoride for Flexible Electromechanical Devices: A Review

Flexible Piezoelectric Acoustic Sensors and Machine Learning for Speech Processing

Doping Effect on Conducting Polymer‐Metal Schottky DC Generators

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