Self-Poled Transparent and Flexible UV Light-Emitting Cerium Complex–PVDF Composite: A High-Performance Nanogenerator

Abstract

Cerium(III)-N,N-dimethylformamide-bisulfate [Ce(DMF)(HSO4)3] complex is doped into poly(vinylidene fluoride) (PVDF) to induce a higher yield (99%) of the electroactive phases (β- and γ-phases) of PVDF. A remarkable enhancement of the output voltage (∼32 V) of a nanogenerator (NG) based on a nonelectrically poled cerium(III) complex containing PVDF composite film is achieved by simple repeated human finger imparting, whereas neat PVDF does not show this kind of behavior. This high electrical output resembles the generation of self-poled electroactive β-phase in PVDF due to the electrostatic interactions between the fluoride of PVDF and the surface-active positive charge cloud of the cerium complex via H-bonding and/or bipolar interaction among the opposite poles of cerium complex and PVDF, respectively. The capacitor charging capability of the flexible NG promises its applicability as piezoelectric-based energy harvester. The cerium(III) complex doped PVDF composite film exhibit an intense photoluminescence in the UV region, which might be due to a participation of electron cloud from negative pole of bipolarized PVDF. This fact may open a new area for prospective development of high-performance energy-saving flexible solid-state UV light emitters.

The influence of hydrogen bonding on the dielectric constant and the piezoelectric energy harvesting performance of hydrated metal salt mediated PVDF films

“…10,50 Storing the generated energy and driving functional electronic devices require a regulated DC power supply (voltage) while piezoelectric harvesters generate time-varying voltages, therefore, the rectification is essential. 10,50 Storing the generated energy and driving functional electronic devices require a regulated DC power supply (voltage) while piezoelectric harvesters generate time-varying voltages, therefore, the rectification is essential.…”

“…For the past few decades, energy harvesting from environmental noise, friction, biomechanical, thermal, and low-frequency mechanical deformation has created a huge impact on the energy sector and thus the scientific community. [2][3][4][5][6][7][8][9][10][11][12] A variety of piezoelectric materials, such as BaTiO 3 , PbZr x Ti 1Àx O 3 (PZT), ZnO, ZnSnO 3 , GaN, and piezoelectric polymers have been examined in diverse forms. 5 The harvested energy is sufficient for the operation of small electronic devices in an aperiodic manner using energy storage devices.…”

“…3 One such device is the nanogenerator, which converts low-frequency vibration and environmental activities (e.g., wind, sound, friction, motion, and thermal energy) into electrical energy through piezoelectric, triboelectric, and pyroelectric effects. [6][7][8][9][10][11][12] As if now, only a few reports are available for fabricating composite nanogenerators where inorganic filler is used as the dopant in piezoelectric polymer, in order to be used under harsh environmental conditions where flexibility is the main concern. However, a real time nanogenerator is required to have effective electrical output and longer cycle stability to support continuous operation in environmental monitoring, defense, and implantable biomedical device applications.…”

DNA-Assisted β-phase Nucleation and Alignment of Molecular Dipoles in PVDF Film: A Realization of Self-Poled Bioinspired Flexible Polymer Nanogenerator for Portable Electronic Devices

“…13,14 Over the years, many different techniques have been used to substitute the electrical poling in the β-phase containing PVDF films such as nanoparticle doping, hydrated salt film, and Langmuir−Schaefer methods where the use of typical polingsteps was avoided. 1,2,15 In this work, we have doped the PVDF matrix with condensed nanostructured DNA to prepare self-poled β-phase containing PVDF films and to subsequently fabricate flexible NGs based on these films. DNA is a complex biopolymer with promising physical and electrical properties.…”

Surface defect engineering: gigantic enhancement in the optical and gas detection ability of metal oxide sensor

“…For metal-oxide nanomaterials, because the high surface-to-volume ratio and surface defect of nanostructures, which made the metal-oxide nanomaterials are quite sensitive for the environment variation [19][20][21][22][23][24][25][26] . Many articles reported that Schottky contact mechanism can enhance the performance of metal-oxide nanomaterials, such as piezotronic devices 27,28 , nanogenerators [29][30][31][32] and nanosensors 20,[33][34][35][36][37][38][39] .…”