Ferroelectric Multilayer Nanocomposites with Polarization and Stress Concentration Structures for Enhanced Triboelectric Performances

Park, Yoojeong; Shin, Young‐Eun; Park, Jonghwa; Lee, Youngsu; Kim, Minsoo P.; Kim, Young-Ryul; Na, Sangyun; Ghosh, Sujoy Kumar

doi:10.1021/acsnano.0c01865

Cited by 101 publications

(77 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To our best knowledge, the triboelectric tactile sensor that can exhibit such an ultrawide linearity range is rarely reported. [ 9,26–29,32,42–46 ] The linear voltage variation over the full scale of pressure spectrum can also be attributed to the linear effective dielectric constant of the optimized hybrid dielectric, which contributes to the linearly increased triboelectric charge density between the hybrid dielectric and electrodes under pressures (the detailed mechanism and discussions can be found in Figures S25 and S26 in the Supporting Information). Besides the ultrawide linearity range, we also noticed that the design of hybrid dielectric with combined low‐ k MCA and high‐ k RDA played a role in enhancing the triboelectrification and electrostatic induction for output voltage amplification (hence sensitivity enhancement).…”

Section: Resultsmentioning

confidence: 99%

Bio‐Inspired Hybrid Dielectric for Capacitive and Triboelectric Tactile Sensors with High Sensitivity and Ultrawide Linearity Range

Zhou

et al. 2021

Advanced Materials

158

View full text Add to dashboard Cite

The trade‐off between sensitivity and linearity is critical for preserving the high pressure‐resolution over a broad range and simplifying the signal processing/conversion of flexible tactile sensors. Conventional dielectrics suffer from the difficulty of quantitatively controlling the interacted mechanical and dielectric properties, thus causing the restricted sensitivity and linearity of capacitive sensors. Herein, inspired by human skin, a novel hybrid dielectric composed of a low‐permittivity (low‐k) micro‐cilia array, a high‐permittivity (high‐k) rough surface, and micro‐dome array is developed. The pressure‐induced series‐parallel conversion between the low‐k and high‐k components of the hybrid dielectric enables the linear effective dielectric constant and controllable initial/resultant capacitance. The gradient compressibility of the hybrid dielectric enables the linear behavior of elastic modulus with pressures, which derives the capacitance variation determined by the effective dielectric constant. Therefore, an ultrawide linearity range up to 1000 kPa and a high sensitivity of 0.314 kPa–1 are simultaneously achieved by the optimized hybrid dielectric. The design is also applicable for triboelectric tactile sensors, which realizes the similar linear behavior of output voltage and enhanced sensitivity. With the high pressure‐resolution across a broad range, potential applications such as healthcare monitoring in diverse scenarios and control command conversion via a single sensor are demonstrated.

show abstract

Section: Resultsmentioning

confidence: 99%

Bio‐Inspired Hybrid Dielectric for Capacitive and Triboelectric Tactile Sensors with High Sensitivity and Ultrawide Linearity Range

Zhou

et al. 2021

Advanced Materials

158

View full text Add to dashboard Cite

show abstract

“…demonstrated the importance of ceramic particle alignment in the matrix, enhancing the stress transfer ability. [ 78 ] The stress transfer improves the ferroelectric NP polarization, thus exhibit high piezoelectric potential. In this work, multilayer ferroelectric nanocomposites were prepared by an alternate coating of BTO NP on the bar coated P(VDF‐TrFE) (Figure 15C).…”

Section: Ferroelectric Materialsmentioning

confidence: 99%

“…Figure 15C also demonstrates using a multi‐layered triboelectric sensor for monitoring carotid and radial artery pressure and human breath. [ 78 ]…”

Section: Ferroelectric Materialsmentioning

confidence: 99%

Materials Beyond Conventional Triboelectric Series for Fabrication and Applications of Triboelectric Nanogenerators

Khandelwal

Raj

Kim

2021

Advanced Energy Materials

192

View full text Add to dashboard Cite

Triboelectric nanogenerators (TENGs) were first developed in 2012, and have become the desirable choice as energy harvesters in the research community worldwide. The popularity of TENGs is attributed to their low weight, low cost, high output, wide range of materials and device designs. TENGs have been explored for many applications including sensing, implantable power sources, healthcare, and biomedical applications. The performance of TENGs depends largely on the material since charge density (σ) is a material property. Moreover, 2D materials have been investigated as an alternative to the conventional metal electrodes. The dominance of polymers and metals in the traditional triboelectric series has lead researchers to explore novel materials to extend the applications and improve TENG output. This review article summarizes the progress in the development of frictional layers and electrode materials for TENGs. The mechanism for the output enhancement and device applications are discussed in detail. Finally, a perspective on the future and relevant challenges in material development for TENGs are discussed.

show abstract

“…Unlike the heterogeneous polymer composites, our group recently demonstrated the effect of ferroelectric multilayer nanocomposites on triboelectric performance ( Fig. 6c) [57]. The multilayered dielectric films consisting of alternating PVDF-TrFE and BaTiO 3 layers display a higher dielectric constant (17.1) than the pure PVDF-TrFE film (13.9) and single PVDF-TrFE/BaTiO 3 nanocomposite (15.9) because of the interfacial polarization between the copolymer and nanoparticle layers, as explained in the section on the multilayered dielectric film (Fig.…”

Section: Dipolar Polarization In Ferroelectric Pvdf Derivativesmentioning

confidence: 99%

mentioning

confidence: 99%

High-Performance Triboelectric Devices via Dielectric Polarization: A Review

Kim

Shin

et al. 2021

Nanoscale Res Lett

Self Cite

View full text Add to dashboard Cite

Energy harvesting devices based on the triboelectric effect have attracted great attention because of their higher output performance compared to other nanogenerators, which have been utilized in various wearable applications. Based on the working mechanism, the triboelectric performance is mainly proportional to the surface charge density of the triboelectric materials. Various approaches, such as modification of the surface functional group and dielectric composition of the triboelectric materials, have been employed to enhance the surface charge density, leading to improvements in triboelectric performances. Notably, tuning the dielectric properties of triboelectric materials can significantly increase the surface charge density because the surface charge is proportional to the relative permittivity of the triboelectric material. The relative dielectric constant is modified by dielectric polarization, such as electronic, vibrational (or atomic), orientation (or dipolar), ionic, and interfacial polarization. Therefore, such polarization represents a critical factor toward improving the dielectric constant and consequent triboelectric performance. In this review, we summarize the recent insights on the improvement of triboelectric performance via enhanced dielectric polarization.

show abstract

Ferroelectric Multilayer Nanocomposites with Polarization and Stress Concentration Structures for Enhanced Triboelectric Performances

Cited by 101 publications

References 51 publications

Bio‐Inspired Hybrid Dielectric for Capacitive and Triboelectric Tactile Sensors with High Sensitivity and Ultrawide Linearity Range

Bio‐Inspired Hybrid Dielectric for Capacitive and Triboelectric Tactile Sensors with High Sensitivity and Ultrawide Linearity Range

Materials Beyond Conventional Triboelectric Series for Fabrication and Applications of Triboelectric Nanogenerators

High-Performance Triboelectric Devices via Dielectric Polarization: A Review

Contact Info

Product

Resources

About