Ultrasensitive mechanical/thermal response of a P(VDF-TrFE) sensor with a tailored network interconnection interface

Abstract

Ferroelectric polymers have great potential applications in mechanical/thermal sensing, but their sensitivity and detection limit are still not outstanding. We propose interface engineering to improve the charge collection in a ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) copolymer (P(VDF-TrFE)) thin film via cross-linking with poly(3,4-ethylenedioxythiophene) doped with polystyrenesulfonate (PEDOT:PSS) layer. The as-fabricated P(VDF-TrFE)/PEDOT:PSS composite film exhibits an ultrasensitive and linear mechanical/thermal response, showing sensitivities of 2.2 V kPa−1 in the pressure range of 0.025–100 kPa and 6.4 V K−1 in the temperature change range of 0.05–10 K. A corresponding piezoelectric coefficient of −86 pC N−1 and a pyroelectric coefficient of 95 μC m−2 K−1 are achieved because more charge is collected by the network interconnection interface between PEDOT:PSS and P(VDF-TrFE), related to the increase in the dielectric properties. Our work shines a light on a device-level technique route for boosting the sensitivity of ferroelectric polymer sensors through electrode interface engineering.

Advances in P(VDF-TrFE) Composites: A Methodical Review on Enhanced Properties and Emerging Electronics Applications

“…Different processing conditions are used to achieve different phases of P(VDF-TrFE) [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. the P-E loop study of PVDF and the copolymer is shown in Figure 5 [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60].…”

“…The copolymer has many advantages, such as ferroelectric phase transition, high electromechanical coupling factor, mechanical stability and spontaneous polarization. A comparative study of the dielectric constant and 𝑑 value of different polymers is listed in Table 1 and the P-E loop study of PVDF and the copolymer is shown in Figure 5 [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60]. creating polarization.…”

Tough and Strain-Sensitive Organohydrogels Based on MXene and PEDOT/PSS and Their Effects on Mechanical Properties and Strain-Sensing Performance

“…Flexible conductive materials have attracted much attention for their wide applications in wearable and soft electronics, such as medical monitoring, human–computer interaction, and energy storage devices. − So far, various flexible conductive materials have been developed for these applications, including conductive hydrogels, liquid metals, carbon materials, conductive polymers, and metal substrates. , Among them, conductive hydrogels, composed of a 3D polymer network and a large amount of water/solvent, are one class of the most popular candidate materials for preparing wearable and soft electronics due to their unique properties, including high stretchability, good biocompatibility, resemblance to living tissues, tunable conductivity, and softness. , In recent years, various conductive hydrogels have been developed for preparing wearable electronics and devices, such as mechanical sensors, electronic skin, and soft robotics . However, practical application of conductive hydrogels still faces challenges.…”

Influence of Stress on the Chiral Polarization and Elastrocaloric Effect in BaTiO3 with 180° Domain Structure

“…Ferroelectric materials are generating significant interest for their potential use in devices that rely on the combination of spontaneous polarization that can be altered by an external electric field or stress [1][2][3][4]. Ferroelectric devices consist of ferroelectrics with a domain structure characterized by varying polarization orientations [5,6].…”