Hybrid Organic/Inorganic Piezoelectric Device for Energy Harvesting and Sensing Applications

Abstract

Novel hybrid organic/inorganic flexible devices with composite films, consisting of Ba0.5Sr0.5TiO3 (BST), were prepared by inserting BST nanocoating under spray deposited Poly-vinylidene fluoride-based co-polymer PVDF-TrFE. The study validated that the crystalline structure of BST remains unaffected by the presence of polymer. The 3D atomic force microscopic image of the composite sample confirmed the improved surface roughness and contact conditions after spraying the polymer. As a result, the hybrid sample exhibited a higher polarization current with reduced impedance and parasitic inductance. The enhancement of the stability of the piezoelectric parameters at multiple bending was observed for the hybrid sample in comparison with the BST single film transducer. The drop of the root mean square (RMS) voltage was 70% after approximately 340,000 numbers of bending against less than 3% for the hybrid BST+PVDF-TrFE device. Due to the effect of the separate layers and summed net charges, the piezoelectric voltage of the hybrid device was competitive to the piezoelectric oxide films, despite the lower piezoelectric coefficient of the polymer. The proposed solution paves the path toward lead-free, wearable energy harvesting devices for low-power consuming electronic devices.

Homochirality-Induced Piezoelectricity in a Single-Component Molecular System

“…Nanogenerators play an important role in the Internet of Things era (IoTs), with applications in e-skin, biomedical devices, and various other wearable electronics. − Harvesting mechanical energy is an attractive green energy generation source with a high potential for powering miniature electronic devices. − Piezoelectric energy harvesting is an efficient way to convert the input mechanical energy into usable electrical energy using the piezoelectric effect of the materials. − Over the past decade, molecular piezoelectric nanogenerators (PENG) have found applications in numerous practical sectors, including optics, microelectronics, precision mechanics, life sciences, etc. − …”

Structure and Thermomechanical Properties of Polyvinylidene Fluoride Film with Transparent Indium Tin Oxide Electrodes

“…In contrast, layered structures also can be useful for various applications. For example, an aluminum electrode deposited on poly (ethylene-2,6 naphtalate) film was used as a substrate for three-layer hybrid material consisting of vacuum-deposited barium-strontium titanate coated on both sides with a spray-deposited PVDF-TrFE copolymer film [ 18 ]; this material has a significant piezoelectric response with low degradation after 340,000 mechanical bending cycles and can potentially be used in wearable energy collection devices. In opposition to layered structures, powder-filled PVDF films usually show significant light absorption.…”