Stretchable conductive nanocomposites of low electrical percolation threshold for washable high-performance-interconnects

Kwag, Seungho; Ko, Youngpyo; Jeon, Jun‐Young; Jang, Doojoon; Park, Minju; Choi, Yuyoung; Cho, Jinhan; Kim, Heesuk

doi:10.1039/d2tc04567b

Cited by 3 publications

(3 citation statements)

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“…Ramli et al 15 found that the PT was around 30 wt% for Polysiloxane–Silver composites. Also, Kwag et al 20 reached to a 63.3 wt% (14.8 vol%) PT for silver composites, and when they introduced a certain amount of boron nitride to the composite, the PT decreased to 52.0 wt% (9.53 vol%). Tang et al 3 reported different PTs for spherical, flake and dendrite silver microparticles of 28, 23 and 13 vol% loaded in PDMS, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…19 For instance, conductive networks might be created at lower percolation concentrations due to the formation of the filler aggregation in the polymer phase. 20 In addition, the chance of filler aggregation increases with decreasing filler particle size due to intermolecular van der Waals forces. However, the presence of filler aggregations could negatively affect the polymer's elastic properties.…”

Section: Introductionmentioning

confidence: 99%

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Effect of processing methods on the electrical conductivity properties of silver-polyurethane composite films (Experimental and numerical studies)

Mehvari,

Goodhew,

González

et al. 2023

Journal of Composite Materials

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This research investigates the electrical properties of micro silver polyurethane (Ag-PU) composite films with different degrees of agglomeration. Ag-PU composite films were prepared by adding micro silver particles (<3.5 μm) into the thermoplastic PU matrix using a solution mixing method, followed by spin-coating or casting techniques. For some composite preparation, the silver solution was shear-mixed in an ultrasonic bath before being added to the PU solution to obtain higher filler dispersion within the polymer matrix. This method produced several composite films with variable degrees of silver aggregation with concentrations from 0 to 14 vol%. All composites showed only electrical conductivity through thickness when compressed under pressure in a range from 0.5 to 20 kPa. Generally, the percolation threshold and conductivity values of the composite film prepared by spin-coating were lower than those of the casting composite. The maximum conductivity value found in these composites was about 2.45 S/m. All composites’ electrical performance was numerically simulated using the finite element analysis method based on the representative volume element model (FE-RVE) with Digimat software. A correlation was observed between the experiments and those simulations. A semi-analytical model was used to estimate the composite electrical parameters.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of processing methods on the electrical conductivity properties of silver-polyurethane composite films (Experimental and numerical studies)

Mehvari,

Goodhew,

González

et al. 2023

Journal of Composite Materials

View full text Add to dashboard Cite

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“…[ 2 ] In these materials, conductive paths begin to form at a critical volume ratio between the conductive filler and the elastomer, i.e., the percolation threshold. [ 3 ] The main sensing principle of such sensors is piezoresistivity, i.e., the change in electrical resistance upon an externally applied mechanical deformation, e.g. tensile strain ( ε ).…”

Section: Introductionmentioning

confidence: 99%

High‐Resolution Printed Ethylene Vinyl Acetate Based Strain Sensor for Impact Sensing

Nazari,

Zimmermann,

Melzer

et al. 2024

Advanced Sensor Research

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The strongly growing interest in digitalizing society requires simple and reliable strain‐sensing concepts. In this work, a highly sensitive stretchable sensor is presented using a straightforward and scalable printing method. The piezoresistive sensor consists of conductive core–shell microspheres embedded in an elastomer. As the elastomer, ethylene vinyl acetate (EVA) is employed as an efficient and cost‐effective alternative compared to polydimethylsiloxane (PDMS). EVA allows for a significantly lower percolation threshold and low hysteresis compared with PDMS. Using 35 µm microspheres, a detection limit of 0.01% is achieved. When using 4 µm microspheres, the sensor shows a detection limit of 0.015% and electromechanical robustness against 1000 cycles of 0–1% strain. The stretchable strain sensor is successfully implemented as an impact sensor and a diaphragm expansion monitoring sensor. Fast (20 ms) and high‐resolution response as well as mechanical robustness to strain values greater than the linear working range of the sensor are demonstrated. The results of this research indicate the promising potential of employing conductive microspheres embedded in the EVA matrix for fast and precise strain detection applications.

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Soft Bioelectronics for Heart Monitoring

Mirzajani,

Kraft

2024

ACS Sens.

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Cardiovascular diseases (CVDs) are a predominant global health concern, accounting for over 17.9 million deaths in 2019, representing approximately 32% of all global fatalities. In North America and Europe, over a million adults undergo cardiac surgeries annually. Despite the benefits, such surgeries pose risks and require precise postsurgery monitoring. However, during the postdischarge period, where monitoring infrastructures are limited, continuous monitoring of vital signals is hindered. In this area, the introduction of implantable electronics is altering medical practices by enabling real-time and out-of-hospital monitoring of physiological signals and biological information postsurgery. The multimodal implantable bioelectronic platforms have the capability of continuous heart sensing and stimulation, in both postsurgery and out-of-hospital settings. Furthermore, with the emergence of machine learning algorithms into healthcare devices, next-generation implantables will benefit artificial intelligence (AI) and connectivity with skin-interfaced electronics to provide more precise and user-specific results. This Review outlines recent advancements in implantable bioelectronics and their utilization in cardiovascular health monitoring, highlighting their transformative deployment in sensing and stimulation to the heart toward reaching truly personalized healthcare platforms compatible with the Sustainable Development Goal 3.4 of the WHO 2030 observatory roadmap. This Review also discusses the challenges and future prospects of these devices.

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Stretchable conductive nanocomposites of low electrical percolation threshold for washable high-performance-interconnects

Abstract: Elastomer-based stretchable conductive composites of high electrical conductivity, mechanical stability and excellent adhesion to the substrates are essential as interconnects for stretchable electronics. Most previous composites require high percolation threshold...

Cited by 3 publications

References 50 publications

Effect of processing methods on the electrical conductivity properties of silver-polyurethane composite films (Experimental and numerical studies)

Effect of processing methods on the electrical conductivity properties of silver-polyurethane composite films (Experimental and numerical studies)

High‐Resolution Printed Ethylene Vinyl Acetate Based Strain Sensor for Impact Sensing

Soft Bioelectronics for Heart Monitoring

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