Dielectric gels with ultra-high dielectric constant, low elastic modulus, and excellent transparency

Shi, Lei; Yang, Ruisen; Lu, Shiyao; Jia, Kun; Xiao, Chunhui; Lu, Tongqing; Wang, Zhihui; Wei, Wei; Tan, Hui; Ding, Shi‐Jin

doi:10.1038/s41427-018-0077-7

Cited by 70 publications

(42 citation statements)

References 32 publications

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“…2d). It is worth noting that the fast deformation and recovery at low strain (10-50%) is a desirable and important property for sensory and actuating applications, such as artificial muscles 40 , skin-like sensors 41 , and tissue-electronic interfaces 42 . With the increase of strain, the cyclic tensile curves were no longer superimposable and hysteresis started to develop.…”

Section: Resultsmentioning

confidence: 99%

Mechanically and biologically skin-like elastomers for bio-integrated electronics

et al. 2020

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The bio-integrated electronics industry is booming and becoming more integrated with biological tissues. To successfully integrate with the soft tissues of the body (eg. skin), the material must possess many of the same properties including compliance, toughness, elasticity, and tear resistance. In this work, we prepare mechanically and biologically skin-like materials (PSeD-U elastomers) by designing a unique physical and covalent hybrid crosslinking structure. The introduction of an optimal amount of hydrogen bonds significantly strengthens the resultant elastomers with 11 times the toughness and 3 times the strength of covalent crosslinked PSeD elastomers, while maintaining a low modulus. Besides, the PSeD-U elastomers show nonlinear mechanical behavior similar to skins. Furthermore, PSeD-U elastomers demonstrate the cytocompatibility and biodegradability to achieve better integration with tissues. Finally, piezocapacitive pressure sensors are fabricated with high pressure sensitivity and rapid response to demonstrate the potential use of PSeD-U elastomers in bio-integrated electronics.

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Section: Resultsmentioning

confidence: 99%

Mechanically and biologically skin-like elastomers for bio-integrated electronics

et al. 2020

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“…Polymer dielectrics, benefiting from their easy processing, lightweight and good flexibility, have generated significant academic and industrial interest for several decades, and have promoted multiple modern technologies such as energy storage systems, [ 1–4 ] flexible electronics, [ 5–9 ] electroactive soft robotics, [ 10–17 ] Generally, dielectric constant of pure polymers is intrinsically low (usually 2–5). Compositing with inorganic fillers, for example, conductive carbons, high‐k ceramics, metal micro‐/nanoparticles is practical for increasing the dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

Improving Dielectric Constant of Polymers through Liquid Electrolyte Inclusion

Shi

Zhang

et al. 2020

Adv Funct Materials

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Different from the traditional ways for enhancing the dielectric properties of polymers by compositing with rigid electronic conductors, here an alternative strategy is reported via introducing ionically conductive liquid electrolytes as functional fillers. Dielectric constant has significantly improved (up to 600%) by liquid electrolyte inclusions in an elastomer matrix. Moreover, by taking advantage of the inherent transparency of liquid electrolyte fillers, high transparency, good stretchability, and high dielectric constant are achieved simultaneously. Using the composite elastomer, the fabrication of highly sensitive strain sensor is demonstrated with 5–6 times higher sensitivity than the pristine elastomer, and flexible electroluminescent device with greatly lowed driving voltage. The strategy provides new opportunities for novel electroactive polymers, including flexible touchscreen panels and displays, biomimetic soft machines, and smart optics.

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“…Gels composed of rigid polymer network swollen by solvent have recently been utilized as functional components of soft devices 16 – 18 . While these gels are generally soft, stretchable, and transparent, their role in such devices is mostly limited by their nature; existing gels are mostly made up of polar materials that are capable of hydrogen bonding 16 , ion–dipole 17 , or dipole–dipole interaction 18 , because non-covalently mixed polymer–solvent system requires strong intermolecular forces. The insufficient interaction in gels would hinder swelling, where then polymer chains remain stiff, consequently losing their gel-like mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Aromatic nonpolar organogels for efficient and stable perovskite green emitters

Park

Kim

et al. 2020

Nat Commun

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Existing gels are mostly polar, whose nature limits their role in soft devices. The intermolecular interactions of nonpolar polymer-liquid system are typically weak, which makes the gel brittle. Here we report highly soft and transparent nonpolar organogels. Even though their elements are only carbon and hydrogen, their elastic modulus, transparency, and stretchability are comparable to common soft hydrogels. A key strategy is introducing aromatic interaction into the polymer-solvent system, resulting in a high swelling ratio that enables efficient plasticization of the polymer networks. As a proof of applicability, soft perovskite nanocomposites are synthesized, where the nonpolar environment of organogels enables stable formation and preservation of highly concentrated perovskite nanocrystals, showing high photoluminescence efficiency (~99.8%) after water-exposure and environmental stabilities against air, water, acid, base, heat, light, and mechanical deformation. Their superb properties enable the demonstration of soft electroluminescent devices that stably emit bright and pure green light under diverse deformations.

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Dielectric gels with ultra-high dielectric constant, low elastic modulus, and excellent transparency

Cited by 70 publications

References 32 publications

Mechanically and biologically skin-like elastomers for bio-integrated electronics

Mechanically and biologically skin-like elastomers for bio-integrated electronics

Improving Dielectric Constant of Polymers through Liquid Electrolyte Inclusion

Aromatic nonpolar organogels for efficient and stable perovskite green emitters

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