High performance piezocomposites for flexible device application

Wearable electronics have become an important part of daily lives. However, its rapid development results in the problem of electronic waste (e‐waste). Consequently, recyclable materials suitable for wearable electronics are highly sought after. In this study, a conductive recyclable composite (PFBC) is designed based on a dynamic covalently cross‐linked elastomer and hierarchical hybrid nanofillers. The PFBC shows excellent wide‐ranging properties including processability, elasticity, conductivity, and stability, which are superior to previous materials used for recyclable electronics, and exhibits outstanding mechanical properties and environmental tolerance including high temperature, high humidity, brine, and ethanol owing to its covalent cross‐linking. Reversible dissociation of Diels–Alder networks allows for convenient processing and recycling. After three recycles, the toughness of the PFBC remained at 10.1 MJ m−3, which is conspicuous among the reported recyclable electronic materials. Three types of PFBC‐based wearable electronics including a triboelectric nanogenerator, a capacitive pressure sensor, and a flexible keyboard, are successfully 3D printed with excellent performance. The PFBC possessed both recyclability and degradability, the combination of which provides a new way to reduce e‐waste. This is the first work to recycle electronics using direct 3D printing and presents promising new design principles and materials for wearable electronics.

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“…3DP provided a simple and efficient method for preparing flexible and retractable keyboards, which usually needed sophisticated assembly. [ 20 ]…”

Section: Resultsmentioning

confidence: 99%

Degradable and Fully Recyclable Dynamic Thermoset Elastomer for 3D‐Printed Wearable Electronics

Guo

Chen

Sun

et al. 2020

Adv Funct Materials

125

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“…a) The piezoelectric charge coefficients ( d 33 ), b) relative dielectric constants (ε 33 ), and c) the piezoelectric voltage coefficients ( g 33 ) of both aligned and randomly distributed samples at different concentrations. d) Comparison of d 33 , ε r , and g 33 values of different types of piezoelectric materials (the values obtained in this study are denoted with red and blue stars): (i) ceramics, [ 57–61 ] (ii) PDMS‐based composites, [ 27,33,62–64 ] (iii) PVDF and PVDF‐TrFE based composites, [ 65–67 ] (iv) PVC‐based composites, [ 68 ] (v) epoxy‐based composites, [ 69 ] and (vi) polymers. [ 9,59,61,70 ] e) Power‐density output of both aligned and randomly distributed samples at different concentrations.…”

Section: Resultsmentioning

confidence: 99%

“…An extraordinary g 33 value of 0.709 Vm N −1 was recorded with an oriented 1 vol% PZT sample, and to the best of our knowledge, is ≈20% greater than the highest g 33 reported in the literature (i.e., 0.6 Vm N −1 ). [ 33 ] Starting at 2 vol%, the contrast between the dielectric constants of the oriented and the random samples increase with the increase in particle loading, which results in lower g 33 values at higher concentrations (Figure 6c). Therefore, as reported in similar studies, [ 27,29 ] the piezoelectric voltage coefficients of the oriented PZT samples each exhibit a maximum at relatively low concentrations.…”

Section: Resultsmentioning

confidence: 99%

“…One of the strategies to achieve high‐performance 1–3 composites is via electric‐field assisted alignment of piezoelectric phase. [ 8,26–33 ] This technique is based on the dielectrophoresis (DEP) principle and can significantly improve the piezoelectric properties of composites even at low filler concentrations due to the formation of high aspect‐ratio columns, also known as pearl‐chains, in a particular dimension. For instance, alignment of lead zirconate titanate nanowires (PZT NWs) in a polyvinylidene fluoride (PVDF) matrix has been proven to enhance the energy density of the nanocomposite up to 51.6% compared with randomly oriented NWs.…”

Section: Introductionmentioning

confidence: 99%

“…[ 30 ] Recently, Gao et al also reported an ultrahigh piezoelectric voltage constant ( g 33 ) of 600 × 10 −3 V m N −1 with dielectrophoretically aligned (Ba 0.85 Ca 0.15 )(Ti 0.90 Zr 0.10 )O 3 (BCZT) particles. [ 33 ]…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Roll‐to‐Roll (R2R) Production of Large‐Area High‐Performance Piezoelectric Films Based on Vertically Aligned Nanocolumn Forests

Yildirim

Grant

Es‐haghi

et al. 2020

Adv Materials Technologies

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The recent advances in flexible piezoelectric technologies have sparked a great interest in developing multifunctional next‐generation transducers, which are in high demand for various challenging applications. Here, novel quasi 1–3 piezoelectric films with record‐high piezoelectric voltage coefficients (g33), reaching up to 0.709 Vm N−1, ≈20% greater than the recently reported highest g33 value in the literature, are reported. These composites are constructed via dielectrophoretic alignment of lead zirconate titanate (PZT) particles enhanced by graphene nanoplatelets, leading to densely structured cone‐shaped nanocolumn forests in the thickness direction. To demonstrate its potential applications, both structured and randomly dispersed samples are characterized and used in various applications ranging from energy harvesting to structural and personal health monitoring. Furthermore, when placed on the sensor surface, the oriented piezoelectric films are shown to detect even the slight movements of a small‐sized insect, demonstrating the ultrasensitivity of the system. Finally, to show the scalability of the dielectrophoretic process, a large area sample (12 ft long and 6‐in.‐wide) is also produced continuously via a novel multifunctional custom designed roll‐to‐roll manufacturing line. To the best of the knowledge, this is the largest single piece of piezoelectric film ever reported in the literature.

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Electroactive Biomaterials Regulate the Electrophysiological Microenvironment to Promote Bone and Cartilage Tissue Regeneration

Chen,

Yang,

Cai

et al. 2024

Adv Funct Materials

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The incidence of large bone and articular cartilage defects caused by traumatic injury is increasing worldwide; the tissue regeneration process for these injuries is lengthy due to limited self‐healing ability. Endogenous bioelectrical phenomenon has been well recognized to play an important role in bone and cartilage homeostasis and regeneration. Studies have reported that electrical stimulation (ES) can effectively regulate various biological processes and holds promise as an external intervention to enhance the synthesis of the extracellular matrix, thereby accelerating the process of bone and cartilage regeneration. Hence, electroactive biomaterials have been considered a biomimetic approach to ensure functional recovery by integrating various physiological signals, including electrical, biochemical, and mechanical signals. This review will discuss the role of endogenous bioelectricity in bone and cartilage tissue, as well as the effects of ES on cellular behaviors. Then, recent advances in electroactive materials and their applications in bone and cartilage tissue regeneration are systematically overviewed, with a focus on their advantages and disadvantages as tissue repair materials and performances in the modulation of cell fate. Finally, the significance of mimicking the electrophysiological microenvironment of target tissue is emphasized and future development challenges of electroactive biomaterials for bone and cartilage repair strategies are proposed.

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High performance piezocomposites for flexible device application

Abstract: An ultrahigh g33 of 600 × 10−3 V m N−1 is achieved by a composite of BCZT particles aligned in a PDMS matrix by dielectrophoresis.

Cited by 29 publications

References 42 publications

Degradable and Fully Recyclable Dynamic Thermoset Elastomer for 3D‐Printed Wearable Electronics

Degradable and Fully Recyclable Dynamic Thermoset Elastomer for 3D‐Printed Wearable Electronics

Roll‐to‐Roll (R2R) Production of Large‐Area High‐Performance Piezoelectric Films Based on Vertically Aligned Nanocolumn Forests

Electroactive Biomaterials Regulate the Electrophysiological Microenvironment to Promote Bone and Cartilage Tissue Regeneration

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