A5084562807- Advanced Sensor and Energy Harvesting Materials
- Dielectric materials and actuators
- Ferroelectric and Piezoelectric Materials
- Conducting polymers and applications
- Innovative Energy Harvesting Technologies
- Multiferroics and related materials
- Electrospun Nanofibers in Biomedical Applications
- Advanced Materials and Mechanics
- Supercapacitor Materials and Fabrication
- Nonlocal and gradient elasticity in micro/nano structures
- Vibration Control and Rheological Fluids
- Acoustic Wave Resonator Technologies
- Gas Sensing Nanomaterials and Sensors
- Polydiacetylene-based materials and applications
- Perovskite Materials and Applications
- 2D Materials and Applications
- ZnO doping and properties
- Advanced Battery Materials and Technologies
- Tactile and Sensory Interactions
- Mechanical and Optical Resonators
- Microwave Dielectric Ceramics Synthesis
- Chalcogenide Semiconductor Thin Films
- Modular Robots and Swarm Intelligence
- High voltage insulation and dielectric phenomena
- Electromagnetic wave absorption materials
Beijing Institute of Nanoenergy and Nanosystems
2016-2024
Chinese Academy of Sciences
2016-2024
Guangxi University
2018-2024
University of Chinese Academy of Sciences
2018-2024
Beijing Institute of Technology
2023
National Center for Nanoscience and Technology
2016-2022
Nano Energy (South Africa)
2021-2022
Yanshan University
2021-2022
Center for Excellence in Education
2019
Beijing University of Chemical Technology
2017
Dielectric polymers with high dipole density have the potential to achieve very energy density, which is required in many modern electronics and electric systems. We demonstrate that a fast discharge speed low loss can be obtained defect-modified poly(vinylidene fluoride) polymers. This achieved by combining nonpolar polar molecular structural changes of polymer proper dielectric constants, avoid displacement saturation at fields well below breakdown field. The results indicate constant may...
The ferroelectric relaxor terpolymer (P(VDF-TrFE-CFE) has a dielectric constant above 50 at room temperature and giant longitudinal strain. By adding only 0.5 wt.-% functionalized multiwalled carbon nanotubes, its crystallinity (light blue, see Figure), Young's modulus (green), (dark blue), electromechanical response (maroon) can be simultaneously improved (see Figure).
The CVD prepared V-MoS<sub>2</sub> heterojunction photodetector exhibits excellent photoelectric performances in a wide broadband with high responsivity, large detectivity, and ultrafast response speed.
Abstract Human machine interface (HMI) devices, which can convert human motions to electrical signals control/charge electronic have attracted tremendous attention from the engineering and science fields. Herein, high output voltage a nonpiezoelectric meso ‐poly(lactic acid) ( ‐PLA) electret‐based triboelectric nanogenerator (NG) is combined with relatively current double‐layered poly( l ‐lactic (PLLA)‐based piezoelectric (PENG) for an E‐skin (electronic skin) device application. The hybrid...
The piezoelectric polymer poly(vinylidene fluoride) (PVDF) has been widely employed for energy harvesting or sensors. Its piezoelectricity originates from the unique crystal structure and oriented electric dipoles. Generally, electrospinning (ES) is able to improve crystallinity of PVDF. In this investigation, three types ES, including far-field ES with random (R-PVDF-FFES) aligned distribution (A-PVDF-FFES) near-field (PVDF-NFES), are applied fabricate a one-step polarized PVDF membrane. To...
One key parameter in using electroactive materials to harvest electric energy from mechanical sources is the conversion efficiency. Recently, it was shown that, relaxor ferroelectric PMN-PT single crystals, a very high longitudinal electromechanical coupling factor (>90%) can be obtained. This paper investigates harvesting 1-3 composites of crystals soft epoxy matrix. It that enable operating mode achieve efficiency for harvesting, and soft-polymer, matrix-supported single-crystal rods...
Poly(γ-benzyl α, L-glutamate) fibers with high non-linear optical activity and thermally stable piezoelectricity are fabricated by simple electrospinning methods that apply directional shear force electric field causing parallel alignment of helical polymer chains permanent dipoles. Detailed facts importance to specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted the authors. Please note: The...
This paper presents for the first time that poly( l ‐lactic acid) (PLLA) nanofibers can show piezoelectricity along fiber direction (d 33 ) by using an electrospinning method. First, electrospun bundles are characterized scanning electron microscope, X‐ray, and piezoelectric coefficient measurements. The data supercritical CO 2 treatment greatly enhance of PLLA fibers, which be resulting from increased crystallinity fibers. Later, it is found generate a current 8 pA voltage 20 mV simple...
In this investigation, it is showed for the first time that a piezoelectric poly‐( l ‐lactic acid) (PLLA) unimorph based cantilever device utilized in energy harvesting applications. The comprises of double layer PLLA and thick polyethylene terephthalate substrate as passive layer. Under optimized conditions, output power devices can reach maximum value 14.17 µW, an open circuit voltage 9.05 V. generated signal be rectified through full‐bridge used to charge lithium‐ion battery 3.2 V within...
Abstract In addition to the rapid urbanization and industrialization around world, air pollution due particulate matter is a substantial threat human health. A considerable research effort has been devoted development of electrospun polymer nanofibers for filter applications. Among these new technologies, electrostatic charge‐assisted filtration promising technology removing small (PM). this investigation, biodegradable poly( l ‐lactic acid) (PLLA) are employed Electrostatic charges...
Abstract The Cu(In,Ga)Se 2 (CIGS) heterojunction, as a mature and high efficiency thin‐film solar cell, is rarely studied photodetector, especially in flexible substrates. In this paper, the structure of an ITO/ZnO/CdS/CIGS/Mo heterojunction grown on polyimide (PI) substrate to form CIGS photodetector. photodetector can work very wide band ranging from 350 1200 nm with responsivity up 1.18 A W −1 (808 nm), detectivity 6.56 × 10 Jones (cmHz 1/2 ), response time 70 (/88) ms, respectively....
The development of a flexible wearable piezoelectric power device has recently caught extensive attention, especially in making inorganic ceramics into polymers from composite with excellent response. As fillers, an oriented polycrystal can improve the mechanical energy efficiency nanogenerators. Herein, two-dimensional BaTiO3-oriented polycrystals are prepared via two-step hydrothermal process based on topochemical conversion mechanism. Additionally, high-performance nanogenerator was...
Recently, due to the advantages of superior compatibility, fewer interface defects, and a high electric breakdown field, all-organic dielectric composites have attracted significant research interest. In this investigation, we produced P(VDF-TrFE-CFE) terpolymer/PI (terp/PI) composite films by incorporating small amount terpolymer into PI substrates for energy density capacitor applications. The resulting terp/PI-5 (5% terpolymer) exhibit permittivity 3.81 at 1 kHz, which is 18.7% greater...
The recent development of electrostrictive polymers has generated new opportunities for high-strain actuators. At the current time, investigation using polymer energy harvesting, or mechanical to electrical conversion, is beginning show its potential this application. In paper we discuss and boundary conditions maximizing harvesting density mechanical-to-electrical coupling materials. Mathematical models different approaches were developed under quasistatic assumptions. Energy densities then...
We investigate the energy harvesting with an electrostrictive polymer, possessing high electromechanical response and elastic density, which make it possible to generate electric density attractive for active scheme. It is shown that combining scheme of polymer yields a harvested ∼40mJ∕cm3 10% efficiency.
Abstract This study reports a self‐powered pressure sensor based on monocharged electret nanogenerator (MENG). The exhibits great advantages in terms of high reliability, ease fabrication, and relatively sensitivity. working mechanism the MENG is studied by both theoretical derivations finite element analyses to determine electric potential distribution during device operation. stable open circuit voltage ≈10 V at 30.8 kPa corresponding sensitivity 325 mV −1 . stability testing result shows...