Flexible Piezoelectric Pressure Tactile Sensor Based on Electrospun BaTiO₃/Poly(vinylidene fluoride) Nanocomposite Membrane

Abstract

Poly­(vinylidene fluoride) (PVDF)-based piezoelectric materials are promising candidates for sensors, transducers, and actuators, due to several distinctive characteristics such as good flexibility, easy processability, and high mechanical resistance. In the present work, PVDF-based nanocomposites loaded with BaTiO3 nanoparticles (NPs) of various weight fractions were prepared by the electrospinning technique and used for the fabrication of a flexible piezoelectric pressure tactile sensor (PPTS). The addition (5, 10, and 20 wt %) of piezoelectric BaTiO3 NPs improves the piezoelectric performance, especially the β phase crystals of PVDF/BaTiO3 (10 wt %) nanocomposites that can reach 91.0%. In addition, the mechanical strength of PVDF/BaTiO3 nanocomposites is up to 26.7 MPa, which is an increase of 66% compared to neat PVDF. It should be emphasized that the elongation at break continuously increases from 71% to 153% with increasing BaTiO3 NPs. More importantly, the PPTS (piezoelectric pressure tactile sensor) with the combination of electrospun PVDF/BaTiO3 nanocomposite membranes and polydimethylsiloxane (PDMS) displays excellent flexibility and linear response to external mechanical force. The flexible PPTS devices capable of detecting different music sounds have potential uses in wide fields, such as voice recognition, speech therapy, and ultrasound imaging.

Superflexible and Lead-Free Piezoelectric Nanogenerator as a Highly Sensitive Self-Powered Sensor for Human Motion Monitoring

“…Self-powered sensors [15], aiming to address the challenge of power supply, have gained growing research interest in recent years [16][17][18]. Among effective energy harvesting technologies, piezoelectric nanogenerators [19][20][21] and triboelectric nanogenerators [22,23] have been applied in body sensors network, smart insoles and many other aspects. The output of triboelectric nanogenerators depends on the coupling effect of contact electrification and electrostatic induction between two triboelectric layers [24].…”

Blending poly(2‐ethyl‐2‐oxazoline) with hydrophobic polymers as a hybrid adhesive with enhancedwater‐resistantproperties

“…Three major crystalline peaks at 18.4 , 20.0 , and 26.7 , which are attributed to the α-phase, 43 are observed in neat PVDF, as shown in Figure 2d. In the 15PVDF/ PEOX and 30PVDF/PEOX blends, a peak at 20.4 is observed, demonstrating the (1 1 0) plane of β crystalline phase PVDF 39 at the same time. The peaks at 18.4 and 26.7 are not legible, indicating that part of the α-phase PVDF is transformed to β-phase by blending with PEOX because the polar fraction of PEOX rotates the dipoles of C F bonds and makes more CF 2 group aligned to the all-trans structure.…”

“…On the other hand, the neat PVDF sample demonstrates the peaks at 761, 796, and 976 cm À1 , which are assigned to the α-phase; the peaks at 841 and 1280 cm À1 indicate the β-phase. 38,39 After mixed with PEOX, the intensity of all PVDF peaks decreases because PVDF is the minor part. The peaks of the β-phase are still legible, but the peaks of the α-phase are less obvious, indicating PVDF in the blends is mainly in the β-phase.…”

Low‐Cost, Highly Sensitive, and Flexible Piezoresistive Pressure Sensor Characterized by Low‐Temperature Interfacial Polymerization of Polypyrrole on Latex Sponge

“…Pressure sensors with flexible, highly sensitive, and wide strain range show great promise in the fields of human motion monitoring, [ 1 ] robotics, [ 2 ] speech recognition, [ 3 ] electronic skin, [ 4 ] wearable healthcare devices, [ 5 ] etc. According to the work principles, pressure sensors have been classified as piezoresistivity, capacitance, piezoelectricity, and triboelectricity.…”