Enhancing the output performance of hybrid nanogenerators based on Al-doped BaTiO3 composite films: a self-powered utility system for portable electronics

The CVD diamond/diamond-like carbon composite film is fabricated on the WC-Co substrate by depositing a layer of Diamond-like Carbon film on the surface of conventional Micro- or Nano-crystalline diamond film. The hot filament chemical vapor deposition (HFCVD) method and vacuum arc discharge with a graphite cathode are adopted respectively to deposit the MCD/NCD and DLC films. A variety of characterization techniques, including filed emission scanning electron microscope (FE-SEM) and Raman spectroscopy are employed to investigate the surface morphology and atomic bonding state of as-deposited MCD/DLC and NCD/DLC composite film. The results show that both MCD/DLC and NCD/DLC composite films present similar surface morphology with the MCD and NCD films, except for scattering a considerable amount of small-sized diamond crystallites among the grain boundary area. The atomic-bonding state of as-deposited MCD/DLC and NCD/DLC composite films is determined by the top-layered DLC film, which is mainly consisted of amorphous carbon phase and no discernible sp3 characteristic peak can be observed from their Raman spectrum. Furthermore, the tribological properties of as-deposited MCD/DLC and NCD/DLC composite films is examined using a ball-on-plate reciprocating friction tester under both dry sliding and water-lubricating conditions, comparing with conventional DLC, MCD and NCD films. Silicon nitride balls are used as counterpart materials. For the CVD diamond/DLC composite films, the self-lubricating effect of top-layered DLC film is beneficial for suppressing the initial friction peak, as well as shortening the run-in period. The average friction coefficients of MCD/DLC and NCD/DLC composite films during stable sliding period are 0.07 and 0.10 respectively in dry sliding; while under water-lubricating condition, they further decreases to 0.03 and 0.07.

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Boosting Performance of Self-Polarized Fully Printed Piezoelectric Nanogenerators via Modulated Strength of Hydrogen Bonding Interactions

Nanomaterials ◽

10.3390/nano11081908 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1908

Author(s):

Hai Li ◽

Sooman Lim

Keyword(s):

Hydrogen Bonding ◽

Composite Film ◽

High Performance ◽

Composite Films ◽

Β Phase ◽

Hydrogen Bonding Interactions ◽

Barium Titanate Nanoparticles ◽

Surface Modified ◽

Piezoelectric Devices ◽

Piezoelectric Nanogenerators

Self-polarized piezoelectric devices have attracted significant interest owing to their fabrication processes with low energy consumption. Herein, novel poling-free piezoelectric nanogenerators (PENGs) based on self-polarized polyvinylidene difluoride (PVDF) induced by the incorporation of different surface-modified barium titanate nanoparticles (BTO NPs) were prepared via a fully printing process. To reveal the effect of intermolecular interactions between PVDF and NP surface groups, BTO NPs were modified with hydrophilic polydopamine (PDA) and hydrophobic 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) to yield PDA-BTO and PFD-BTO, respectively. This study demonstrates that the stronger hydrogen bonding interactions existed in PFD-BTO/PVDF composite film comparative to the PDA-BTO/PVDF composite film induced the higher β-phase formation (90%), which was evidenced by the XRD, FTIR and DSC results, as well as led to a better dispersion of NPs and improved mechanical properties of composite films. Consequently, PFD-BTO/PVDF-based PENGs without electric poling exhibited a significantly improved output voltage of 5.9 V and power density of 102 μW cm−3, which was 1.8 and 2.9 times higher than that of PDA-BTO/PVDF-based PENGs, respectively. This study provides a promising approach for advancing the search for high-performance, self-polarized PENGs in next-generation electric and electronic industries.

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Significantly Improved Dielectric Performance of Poly(1-butene)-Based Composite Films via Filling Polydopamine Modified Ba(Zr0.2Ti0.8)O3-Coated Multiwalled Carbon Nanotubes Nanoparticles

Polymers ◽

10.3390/polym13020285 ◽

2021 ◽

Vol 13 (2) ◽

pp. 285

Author(s):

Lingfei Li ◽

Qiu Sun ◽

Xiangqun Chen ◽

Zhaohua Jiang ◽

Yongjun Xu

Keyword(s):

Carbon Nanotubes ◽

Dielectric Constant ◽

Energy Storage ◽

Composite Film ◽

Multiwalled Carbon Nanotubes ◽

Sol Gel ◽

Composite Films ◽

Weak Electric Field ◽

Multiwalled Carbon ◽

Dielectric Performance

The low dielectric constant of the nonpolar polymer poly(1-butene) (PB-1) limits its application as a diaphragm element in energy storage capacitors. In this work, Ba(Zr0.2Ti0.8)O3-coated multiwalled carbon nanotubes (BZT@MWCNTs) were first prepared by using the sol–gel hydrothermal method and then modified with polydopamine (PDA) via noncovalent polymerization. Finally, PB-1 matrix composite films filled with PDA-modified BZT@MWCNTs nanoparticles were fabricated through a solution-casting method. Results indicated that the PDA-modified BZT@MWCNTs had good dispersion and binding force in the PB-1 matrix. These characteristics improved the dielectric and energy storage performances of the films. Specifically, the PDA-modified 10 vol% BZT@ 0.5 vol% MWCNTs/PB-1 composite film exhibited the best dielectric performance. At 1 kHz, the dielectric constant of this film was 25.43, which was 12.7 times that of pure PB-1 films. Moreover, its dielectric loss was 0.0077. Furthermore, under the weak electric field of 210 MV·m−1, the highest energy density of the PDA-modified 10 vol% BZT@ 0.5 vol% MWCNTs/PB-1 composite film was 4.57 J·cm−3, which was over 3.5 times that of PB-1 film (≈1.3 J·cm−3 at 388 MV·m−1).

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Enhanced thermal conductivity of polyimide composite film filled with hybrid fillers

High Performance Polymers ◽

10.1177/09540083211000393 ◽

2021 ◽

pp. 095400832110003

Author(s):

Ruiyi Li ◽

Chengcheng Ding ◽

Juan Yu ◽

Xiaodong Wang ◽

Pei Huang

Keyword(s):

Thermal Conductivity ◽

Composite Film ◽

Hexagonal Boron Nitride ◽

Composite Films ◽

Resistance Index ◽

Reference Value ◽

Residual Rate ◽

Practical Applications ◽

Hybrid Fillers ◽

The Matrix

In this article, the polyimide (PI) composite films with synergistically improving thermal conductivity were prepared by adding a few graphene nanoplatelets (GNP) and various hexagonal boron nitride (h-BN) contents into the PI matrix. The thermal conductivity of PI composite film with 1 wt% GNP and 30 wt% h-BN content was 1.21 W(m·k)− 1, which was higher than that of the PI composite film with 30 wt% h-BN content (0.45 W(m·k)− 1), the synergistic efficiency of GNP under various h-BN content (10 wt%, 20 wt%, and 30 wt%) were 1.70, 2.71, and 3.09, respectively. And it was found that the increased h-BN content can suppress the dielectric properties caused by GNP in the matrix. The dielectric permittivity and dielectric loss tangent of 1 wt% GNP/PI composite film were 10.69, 0.661 at 103 Hz, respectively, and that of the 30 wt% h-BN + GNP/PI composite film were 4.29 and 0.1367, respectively. Moreover, the mechanical properties of the PI composite film were suitable for practical applications. And the heat resistance index and the residual rate at 700°C of PI composite film increased to 326.8°C, 74.43%, respectively, and these of PI film were 292.6°C and 59.26%. Thus, it may provide a reference value for applying the filler hybridization/PI film in the electronic packaging materials.

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Textile-Based Triboelectric Nanogenerators for Wearable Self-Powered Microsystems

Micromachines ◽

10.3390/mi12020158 ◽

2021 ◽

Vol 12 (2) ◽

pp. 158

Author(s):

Peng Huang ◽

Dan-Liang Wen ◽

Yu Qiu ◽

Ming-Hong Yang ◽

Cheng Tu ◽

...

Keyword(s):

Rapid Development ◽

Electronic Devices ◽

Quantitative Relationship ◽

Triboelectric Nanogenerator ◽

Output Performance ◽

Integrated Microsystems ◽

Wearable Electronic ◽

Self Powered ◽

Representative Work ◽

Wearable Electronic Devices

In recent years, wearable electronic devices have made considerable progress thanks to the rapid development of the Internet of Things. However, even though some of them have preliminarily achieved miniaturization and wearability, the drawbacks of frequent charging and physical rigidity of conventional lithium batteries, which are currently the most commonly used power source of wearable electronic devices, have become technical bottlenecks that need to be broken through urgently. In order to address the above challenges, the technology based on triboelectric effect, i.e., triboelectric nanogenerator (TENG), is proposed to harvest energy from ambient environment and considered as one of the most promising methods to integrate with functional electronic devices to form wearable self-powered microsystems. Benefited from excellent flexibility, high output performance, no materials limitation, and a quantitative relationship between environmental stimulation inputs and corresponding electrical outputs, TENGs present great advantages in wearable energy harvesting, active sensing, and driving actuators. Furthermore, combined with the superiorities of TENGs and fabrics, textile-based TENGs (T-TENGs) possess remarkable breathability and better non-planar surface adaptability, which are more conducive to the integrated wearable electronic devices and attract considerable attention. Herein, for the purpose of advancing the development of wearable electronic devices, this article reviews the recent development in materials for the construction of T-TENGs and methods for the enhancement of electrical output performance. More importantly, this article mainly focuses on the recent representative work, in which T-TENGs-based active sensors, T-TENGs-based self-driven actuators, and T-TENGs-based self-powered microsystems are studied. In addition, this paper summarizes the critical challenges and future opportunities of T-TENG-based wearable integrated microsystems.

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Maximizing piezoelectricity by self-assembled highly porous perovskite–polymer composite films to enable the internet of things

Journal of Materials Chemistry A ◽

10.1039/d0ta03416a ◽

2020 ◽

Vol 8 (27) ◽

pp. 13619-13629 ◽

Cited By ~ 4

Author(s):

Asif Abdullah Khan ◽

Md Masud Rana ◽

Guangguang Huang ◽

Nanqin Mei ◽

Resul Saritas ◽

...

Keyword(s):

Internet Of Things ◽

Polymer Composite ◽

High Performance ◽

Composite Films ◽

The Internet ◽

Next Generation ◽

Self Assembled ◽

Self Powered ◽

The Internet Of Things ◽

Highly Porous

A high-performance perovskite/polymer piezoelectric nanogenerator for next generation self-powered wireless micro/nanodevices.

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Ecofriendly Preparation and Characterization of a Cassava Starch/Polybutylene Adipate Terephthalate Film

Processes ◽

10.3390/pr8030329 ◽

2020 ◽

Vol 8 (3) ◽

pp. 329

Author(s):

Tan Yi ◽

Minghui Qi ◽

Qi Mo ◽

Lijie Huang ◽

Hanyu Zhao ◽

...

Keyword(s):

Mechanical Properties ◽

Contact Angle ◽

Water Vapor ◽

Composite Film ◽

Water Absorption ◽

Composite Films ◽

Thermoplastic Starch ◽

Light Transmittance ◽

Infrared Spectrometry ◽

Nano Zno

Composite films of polybutylene adipate terephthalate (PBAT) were prepared by adding thermoplastic starch (TPS) (TPS/PBAT) and nano-zinc oxide (nano-ZnO) (TPS/PBAT/nano-ZnO). The changes of surface morphology, thermal properties, crystal types and functional groups of starch during plasticization were analyzed by scanning electron microscopy, synchronous thermal analysis, X-ray diffraction, infrared spectrometry, mechanical property tests, and contact Angle and transmittance tests. The relationship between the addition of TPS and the tensile strength, transmittance, contact angle, water absorption, and water vapor barrier of the composite film, and the influence of nano-ZnO on the mechanical properties and contact angle of the 10% TPS/PBAT composite film. Experimental results show that, after plasticizing, the crystalline form of starch changed from A-type to V-type, the functional group changed and the lipophilicity increased; the increase of TPS content, the light transmittance and mechanical properties of the composite membrane decreased, while the water vapor transmittance and water absorption increased. The mechanical properties of the composite can be significantly improved by adding nano-ZnO at a lower concentration (optimum content is 1 wt%).

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The Preparation and Property Research on Laponite-Poly (L-Lactide) Composite Film

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.750-752.1919 ◽

2013 ◽

Vol 750-752 ◽

pp. 1919-1923 ◽

Cited By ~ 1

Author(s):

Guo Xian Zhou ◽

Ming Wei Yuan ◽

Lin Jiang ◽

Ming Long Yuan ◽

Hong Li Li

Keyword(s):

Electron Microscopy ◽

Thermal Stability ◽

Tensile Strength ◽

Composite Film ◽

Composite Films ◽

Complexing Agent ◽

Solution Blending ◽

Method Of Solution ◽

Thermal Stability Of ◽

Scanning Electron

The laponite-poly (L-lactide) composite films are prepared by the method of solution blending with polylactide (PLA) and laponite. The result shows that the homogeneous and smooth composite film is prepared with 1, 4-dioxane. Thermogravimetry analysis (TG) and tensile strength studies demonstrate that the thermal stability and tensile strength are improved with the laponite added. The scanning electron microscopy (SEM) measurement indicates that the pores of composite films get uniform and network structure is more and more compact with compared to pure PLA film. The present study reveals that the laponite as a complexing agent can improve the mechanical properties and thermal stability of PLA.

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Self Powered Flexible Electronics Based on Self Poled “Ferroelectretic” Nanogenerator

MRS Advances ◽

10.1557/adv.2016.319 ◽

2016 ◽

Vol 1 (45) ◽

pp. 3083-3088 ◽

Cited By ~ 2

Author(s):

Sujoy Kumar Ghosh ◽

Dipankar Mandal

Keyword(s):

Composite Film ◽

Flexible Electronics ◽

Light Emitting Diode ◽

Open Circuit ◽

Pvdf Film ◽

Light Emitting ◽

Single Finger ◽

Finger Touch ◽

Self Powered ◽

Pure Pvdf

ABSTRACTA ferroelectric nanogenerator without any electric poling treatment has been realized by incorporation of ytterbium (Yb) salt incorporated porous PVDF composite film. The composite film compose of electroactive β- and γ-phases, demonstrates higher dielectric and ferroelectric polarization responses than pure PVDF film. The 3 V of open circuit voltage with 0.47 µW/cm2 power density was generated by the nanogenerator upon single finger touch. It can also operate capacitor and light emitting diode without any subsidiary batteries.

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Improvements of the Output Performance of the Polyethylene Oxide Based Triboelectric Nanogenerators by Introducing the Shell-core Ag@SiO2 Particles

Journal of Materials Chemistry C ◽

10.1039/d1tc04831g ◽

2021 ◽

Author(s):

Xu Liu ◽

Xiao-Rong Sun ◽

Chen Luo ◽

Hong-zhi Ma ◽

Hua Yu ◽

...

Keyword(s):

Polyethylene Oxide ◽

Output Performance ◽

Sio2 Particles ◽

Self Powered ◽

Triboelectric Nanogenerators

The development of self-powered technology in nano energy puts forward higher requirements for triboelectric nanogenerators (TENGs), in which it is necessary to further improve output performance to broaden the scope...

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