Tunable electrical and mechanical responses of PDMS and polypyrrole nanowire composites

Du, Ping; Lin, Xi; Zhang, Xin

doi:10.1088/0022-3727/46/19/195303

Cited by 12 publications

(12 citation statements)

References 40 publications

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“…Du et al . reported that the introduction of conducting polymer nanowires (CPNWs) to the PDMS matrix could significantly increase the dielectric constant by <4 times compared with neat PDMS [ 68 ]. To improve the solvent-resistance behavior of SEBS dielectrics, Wang et al .…”

Section: Intrinsically Flexible Dielectric Materials For Otftsmentioning

confidence: 99%

Intrinsically flexible displays: key materials and devices

Zhao

Liu

et al. 2022

National Science Review

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The continuous progress in flexible electronics is shaping human lives for more convenience and comfort. In this field, the interconnection and novel display applications are acknowledged as an important future direction. However, it is a huge scientific and technical challenge to develop intrinsically flexible displays due to the limited display panel by its size and shape. To address this conundrum, it is crucial to develop intrinsically flexible electrode materials, semiconductor materials, dielectric materials as well as the relevant flexible transistor drivers and display panels. In this review, we focus on the recent progress in this field from seven aspects: background and concept, intrinsically flexible electrode materials, intrinsically flexible organic semiconductors and dielectric materials for organic thin film transistors (OTFTs), intrinsically flexible organic emissive semiconductors for electroluminescent devices, and OTFT-driven electroluminescent devices for intrinsically flexible displays. Finally, some personal suggestions and prospects for the future development of intrinsically flexible displays were proposed.

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Section: Intrinsically Flexible Dielectric Materials For Otftsmentioning

confidence: 99%

Intrinsically flexible displays: key materials and devices

Zhao

Liu

et al. 2022

National Science Review

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“…Materials such as polyimide (PI) and PDMS provide choices in polymeric backbone layers with improved mechanical match for dynamic biological tissue experiments (Young's modulus of PI: 2.5 GPa 25 and PDMS: 360 kPa-2.97 MPa 26,27 ). Further, PDMS is commonly used in 2-2.5D flexible devices as both the substrate and the insulation material, because it also provides tunable mechanical and dielectric properties 28 . In this work, PDMS has been used as an elastomeric insulation and thin Kapton ® PI has been used as a packaging substrate.…”

Section: Introductionmentioning

confidence: 99%

Capabilities and limitations of 3D printed microserpentines and integrated 3D electrodes for stretchable and conformable biosensor applications

2020

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We explore the capabilities and limitations of 3D printed microserpentines (µserpentines) and utilize these structures to develop dynamic 3D microelectrodes for potential applications in in vitro, wearable, and implantable microelectrode arrays (MEAs). The device incorporates optimized 3D printed µserpentine designs with out-of-plane microelectrode structures, integrated on to a flexible Kapton® package with micromolded PDMS insulation. The flexibility of the optimized, printed µserpentine design was calculated through effective stiffness and effective strain equations, so as to allow for analysis of various designs for enhanced flexibility. The optimized, down selected µserpentine design was further sputter coated with 7-70 nm-thick gold and the performance of these coatings was studied for maintenance of conductivity during uniaxial strain application. Bending/conforming analysis of the final devices (3D MEAs with a Kapton® package and PDMS insulation) were performed to qualitatively assess the robustness of the finished device toward dynamic MEA applications. 3D microelectrode impedance measurements varied from 4.2 to 5.2 kΩ during the bending process demonstrating a small change and an example application with artificial agarose skin composite model to assess feasibility for basic transdermal electrical recording was further demonstrated.

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“…12 Following this route in recent years a number of papers were published on the electrical and mechanical properties of composites composed of an elastomer such as poly-dimethylsiloxane (PDMS) together with metallic nanoparticles (NP) or carbon nanotubes. [15][16][17][18] It was shown that the unique elastic properties of PDMS are indeed preserved even in the metallic state, i.e., for metal filling factors above the percolation threshold. 19 This allows for tuning the electrical resistance of the composites by stretching the elastomer.…”

Section: Introductionmentioning

confidence: 99%

Tuning the dielectric properties of metallic-nanoparticle/elastomer composites by strain

et al. 2015

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Tunable metal/dielectric composites are promising candidates for a large number of potential applications in electronics, sensor technologies and optical devices. Here we systematically investigate the dielectric properties of Ag-nanoparticles embedded in the highly flexible elastomer poly-dimethylsiloxane (PDMS). As tuning parameter we use uniaxial and biaxial strain applied to the composite. We demonstrate that both static variations of the filling factor and applied strain lead to the same behavior, i.e., the filling factor of the composite can be tuned by application of strain. In this way the effective static permittivity εeff of the composite can be varied over a very large range. Once the Poisson's ratio of the composite is known, the strain dependent dielectric constant can be accurately described by effective medium theory without any additional free fit parameter up to metal filling factors close to the percolation threshold. It is demonstrated that, starting above the percolation threshold in the metallic phase, applying strain provides the possibility to cross the percolation threshold into the insulating region. The change of regime from conductive phase down to insulating follows the description given by percolation theory and can be actively controlled.

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Tunable electrical and mechanical responses of PDMS and polypyrrole nanowire composites

Cited by 12 publications

References 40 publications

Intrinsically flexible displays: key materials and devices

Intrinsically flexible displays: key materials and devices

Capabilities and limitations of 3D printed microserpentines and integrated 3D electrodes for stretchable and conformable biosensor applications

Tuning the dielectric properties of metallic-nanoparticle/elastomer composites by strain

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