Soluble salt-driven matrix swelling of a block copolymer for rapid fabrication of a conductive elastomer toward highly stretchable electronics

Hu, Mingjun; Zhang, Naibo; Guo, Qiuquan; Cai, Xiaobing; Zhou, Shaolin; Yang, Jun

doi:10.1016/j.matdes.2016.03.143

Cited by 12 publications

(6 citation statements)

References 42 publications

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“…Comparison of the return loss of the antenna at different strains with typical literature results was listed in Figure a and Table S4 (Supporting Information) . Our antenna showed much lower return loss for the investigated strains compared with literature results.…”

Section: Resultssupporting

confidence: 51%

“…The Q S values of the (nanosilver‐SEBS) 5 antenna were 8.0, 36.0, and 5.1, for strain change from 0% to 50%, 75%, and 100%, respectively. For comparison, pioneering work about mechanically tunable antennas based on EGaIn, copper, and silver nanoparticles have be reported by the groups of Whitesides, Rogers, and Jun, which showed Q S values of 2.7, 1.7, and 2.8 for a strain range of 120%, 30%, and 133%, respectively (Figure d) . Our (nanosilver‐SEBS) m antennas showed highest insensitivity of the return loss against strain, indicating stable transmitted power during deformation.…”

Section: Resultsmentioning

confidence: 66%

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A General Approach for Buckled Bulk Composites by Combined Biaxial Stretch and Layer‐by‐Layer Deposition and Their Electrical and Electromagnetic Applications

Liu

Wan

Mou

et al. 2019

Adv Elect Materials

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Fabrication of high quality stretchable conductors that show bulk structure, high electrical conductivity, and stable conductance under large deformations is crucial for wearable electronics and soft robots. A key difficulty here is to introduce buckled structure into the conductive phase of the bulk conductors and overcome the lateral crack problem in the conductive phase during buckle formation. In this paper, a general approach is introduced for fabricating novel buckled bulk composite (BBC) stretchable conductors based on common conductive nanomaterial by using sequential biaxial stretch–release and layer‐by‐layer deposition to provide alternating buckled conductive layers and elastomer layers. This biaxial stretch is used to keep the width of elastomers unchanged before and after stretching, to avoid the lateral crack formation of the conductive layer. This method can be applied to common nanoparticles, such as silver nanoparticles, silver nanowires, single‐walled carbon nanotubes, and graphenes. The BBCs exhibit high conductance, uniform structure, and stable conductance during deformation and temperature change, which are demonstrated as applications in electrical interconnects, electrothermally driven artificial muscles, electromagnetic interference shielding materials, and reconfigurable antennas.

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Section: Resultssupporting

confidence: 51%

Section: Resultsmentioning

confidence: 66%

A General Approach for Buckled Bulk Composites by Combined Biaxial Stretch and Layer‐by‐Layer Deposition and Their Electrical and Electromagnetic Applications

Liu

Wan

Mou

et al. 2019

Adv Elect Materials

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“…Composites based on silver flakes (AgF) constitute one of the most promising systems for high-performance stretchable bulk conductors . The incorporation of silver nanoparticles (AgNPs) formed from AgF inside the matrix can improve conductivity and stability under high strains by bridging the gaps between AgFs and thereby improving the electrical contact between the flakes. − As an alternative, nanoparticles can be prepared and mixed during the composite fabrication process. , Yet, another way is by forming AgNPs in situ by chemical reduction of silver ions, from which it is possible to obtain high concentrations of well-dispersed AgNP within a polymer matrix, − but this method has so far not been used together with AgFs and thus the optimal amount of AgNP is unknown. A compact soft haptic system entirely based on soft materials and composites with mechanical properties analogous to epidermal tissue is yet to be demonstrated, which can provide new opportunities in feedback systems for prosthetics, virtual and augment reality tools.…”

Section: Introductionmentioning

confidence: 99%

Soft Electromagnetic Vibrotactile Actuators with Integrated Vibration Amplitude Sensing

Vural

Mohammadi

Seufert

et al. 2023

ACS Appl. Mater. Interfaces

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Soft vibrotactile devices have the potential to expand the functionality of emerging electronic skin technologies. However, those devices often lack the necessary overall performance, sensing-actuation feedback and control, and mechanical compliance for seamless integration on the skin. Here, we present soft haptic electromagnetic actuators that consist of intrinsically stretchable conductors, pressure-sensitive conductive foams, and soft magnetic composites. To minimize joule heating, high-performance stretchable composite conductors are developed based on in situ-grown silver nanoparticles formed within the silver flake framework. The conductors are laser-patterned to form soft and densely packed coils to further minimize heating. Soft pressure-sensitive conducting polymer-cellulose foams are developed and integrated to tune the resonance frequency and to provide internal resonator amplitude sensing in the resonators. The above components together with a soft magnet are assembled into soft vibrotactile devices providing high-performance actuation combined with amplitude sensing. We believe that soft haptic devices will be an essential component in future developments of multifunctional electronic skin for future human−computer and human−robotic interfaces.

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“…SBS is a three-dimensional stretchable fiber, which, after absorbing the Ag precursor, can be used to fabricate a pattern with various conductivities in the three-dimensional form through reduction [19,20,21]. Song et al have fabricated selective patterns on SBS using a nozzle printer [19].…”

Section: Introductionmentioning

confidence: 99%

Photochemical Reduction of Silver Precursor and Elastomer Composite for Flexible and Conductive Patterning

Kim

Cho

et al. 2019

Materials

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The development of ink-based printing techniques has enabled the fabrication of electric circuits on flexible substrates. Previous studies have shown that the process method which uses a silver (Ag) precursor (AgCF3COO) and electrospun poly(styrene-block-butadiene-block-styrene) (SBS) can yield patterns with high conductivity and stretchability. However, the only method to reduce the Ag precursor absorbed in SBS is chemical reduction using a toxic solution. Here, we developed a process to fabricate a high-conductivity pattern via laser reduction by photo-chemical reaction without toxic solutions. The Ag precursor was absorbed in electrospun SBS to form a composite layer (composite SBS) with modified properties, that could more effectively absorb the photon energy than SBS without the Ag precursor. We analyzed the properties of this material, such as its light absorption coefficient, heat conductivity, and the density of both SBS and composite SBS to allow comparison of the two materials by numerical simulation. In addition, we fabricated patterns on highly heat-sensitive substrates such as burning paper and a polyethylene terephthalate (PET) thin film, as the pattern can be implemented using very low laser energy. We expect the proposed approach to become a key technology for implementing user-designed circuits for wearable sensors and devices on various flexible substrates.

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Soluble salt-driven matrix swelling of a block copolymer for rapid fabrication of a conductive elastomer toward highly stretchable electronics

Cited by 12 publications

References 42 publications

A General Approach for Buckled Bulk Composites by Combined Biaxial Stretch and Layer‐by‐Layer Deposition and Their Electrical and Electromagnetic Applications

A General Approach for Buckled Bulk Composites by Combined Biaxial Stretch and Layer‐by‐Layer Deposition and Their Electrical and Electromagnetic Applications

Soft Electromagnetic Vibrotactile Actuators with Integrated Vibration Amplitude Sensing

Photochemical Reduction of Silver Precursor and Elastomer Composite for Flexible and Conductive Patterning

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