Extremely rapid and simple healing of a transparent conductor based on Ag nanowires and polyurethane with a Diels–Alder network

Pyo, Kyoung-hee; Lee, Da Hee; Kim, Young‐Min; Kim, Jong‐Woong

doi:10.1039/c5tc04030b

Cited by 58 publications

(52 citation statements)

References 34 publications

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“…[30] A mixture of diol 1 (0.86 g, 4.0 mmol) and silicone polyol (4.0 g, 4.0 mmol) in alcohol was treated with a solution of IPDI (1.8 g, 8.0 mmol) in DMF (5.8 g), and the resulting mixture was heated at 60 °C for 2 h to obtain a clear solution of RC-PDMS-a. Diol 1 was prepared by heating a stirred mixture of furfurylamine (4.9 g, 50.8 mmol) and glycerol 1,2-carbonate (6.0 g, 50.8 mmol) at 60 °C for 3 h, as reported in the previous paper.…”

Section: Methodsmentioning

confidence: 99%

Interfaceless Strain and Pressure‐Sensitive Stretchable Capacitor Based on Self‐Bonding and Surface Morphology Control of a Reversibly Crosslinkable Silicone Elastomer

Choi

Han

Lee

et al. 2020

Adv Materials Technologies

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the changes in electrical parameters (such as conductivity and impedance) or the geometry of a specific material produced by small mechanical deformations. [22] Here, general requirements for an excellent mechanical sensor usually refer to a high gauge factor (the ratio of the relative changes in the measured property to the mechanical strain), but in the case of a stretchable strain and pressure sensor, some other conditions must also be satisfied. The implementation of stretchable sensors means that the sensor must be elastic enough to be stretched or shrunk beyond a certain level, the performance of the sensor should not be degraded even when it is stretched, and the sensor should be able to withstand repeated stretch-and-release.Capacitive sensors, which transduce a physical contact with a conductive object (such as human finger) into a change in capacitance, have been used in commercial touch sensors as they have a short response time, a simple read-out mechanism, and high sensitivity even under extremely weak interactions with an external conductive object. [23] The capacitive sensory mechanism has also been employed to obtain pressure sensors by using a layer of soft dielectric polymer sandwiched between two flexible transparent electrode layers, where the capacitance is formed. [22,24] When pressure is applied to the sensor, the thickness of the inserted dielectric layer between the two electrodes is reduced, resulting in an increase in capacitance, which can be used as a sensing parameter. In order for the pressure sensor to have stretchability, all elements constituting the sensor, that is, the upper and lower substrate, the centering dielectric layer, and the electrodes, should have large elasticity or sufficient conductivity even in the stretched state. Furthermore, the interface between each layer in the pressure sensor should be chemically robust so that delamination or severe plastic deformation at the interface can be prevented after repeated stretch-and-release.In this respect, the most ideal sensor structure is that all components except the electrodes are formed of the same material, or at least share equivalent physical/mechanical properties. Unfortunately, most stretchable pressure sensors reported so far have been fabricated by bonding two elastic polymer substrates with an adhesive [25][26][27] or by coating a liquid oligomer on a pre-cured polymer film to form a multilayer [28] ; thus, it is A typical capacitive mechanical sensor implemented using a layer of soft dielectric polymer sandwiched between two flexible electrodes, where the capacitance is formed, suffers from unintended buckling instability upon repeated stretch-and-release owing to different mechanical characteristics of constituent materials and unstable interfaces. Here, a stretchable, healable, and transparent strain/pressure-sensitive capacitor is successfully fabricated by hybridizing Ag nanowires (AgNWs) with a polydimethylsiloxane containing maleimide-derived Diels-Alder (DA) adducts as reversible crosslinkers. AgNWs for...

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Section: Methodsmentioning

confidence: 99%

Interfaceless Strain and Pressure‐Sensitive Stretchable Capacitor Based on Self‐Bonding and Surface Morphology Control of a Reversibly Crosslinkable Silicone Elastomer

Choi

Han

Lee

et al. 2020

Adv Materials Technologies

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“…a) PVA: poly(vinyl alcohol) [99,127,128] , b) PAA: polyacrylic acid [71,80,97,98] , c) PDMS: polydimethylsiloxane [42,77,83] , d) PDMAA: poly(N,N-dimethylacrylamide) [51,52] , e) PMCMA-co-PCMA: poly[2-(ethylcarbamoyloxy)ethyl methacrylate-co-2-(ethylcarbamoyloxy)ethyl acrylate [56] ], f) PCL: polycaprolactone [69,75] , g) bPEI: branched polyethylenimine [62,71,80] , h) PU: polyurethane. [43,81,[91][92][93] www.advancedsciencenews.com Adv. Energy Mater.…”

Section: Discussionmentioning

confidence: 99%

“…In order to speed up the healing process, external stimuli such as heat and moisture can be applied to improve the chain dynamic and assembly activities. For latter, many types of dynamic covalent bonds including Diels-Alder reaction, [35,42,43] disulfide, [44] acylhydrazone, [45] ester, [37,46,47] olefin, [38] imine [39,40,48,49] are feasible for the development of such intrinsic self-healing materials. Due to the slow kinetic of covalent formation, as compared with the noncovalent case, external stimulus such as heat, pH change, light and catalyst is always needed to trigger the healing process.…”

Section: Intrinsic Self-healing Polymers With Reversible Bondsmentioning

confidence: 99%

“…Similarly, Pei's group presented a semitransparent composite conductor comprising a conductive layer of AgNWs percolation network embedded in the surface layer of a Diels-Alder (DA) based healable polymer film. [72] Based on the similar concept of the combination of highly conductive AgNWs layer with healable polymer matrix, other types of healable polymer matrix such as polyurethane crosslinked Diels-Alder adducts, [42,43] thermoplastic polycaprolactone, [75] photochromic healable materials, [76] dynamic-covalent boroxine bonds based polymer [77] and other conductive networks such as copper nanowires (CuNWs), [81] carbon nanotubes [78,80] have also been developed to fabricate self-healable conductors.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

“…[12,42,43, The reformation of bonding can occur either between two polymer chains, or two or more different polymers, or between polymer chain and other guest small molecules or nanomaterials. As such, it allows the realization of many different kinds functional self-healing materials, which will be discussed later.…”

Section: Intrinsic Self-healing Polymers With Reversible Bondsmentioning

confidence: 99%

See 2 more Smart Citations

Self‐Healing Materials for Next‐Generation Energy Harvesting and Storage Devices

Chen

Wang

Yang

et al. 2017

Advanced Energy Materials

228

174

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Because of the great breakthroughs of self‐healing materials in the past decade, endowing devices with self‐healing ability has emerged as a particularly promising route to effectively enhance the device durability and functionality. This article summarizes recent advances in self‐healing materials developed for energy harvesting and storage devices (e.g., nanogenerators, solar cells, supercapacitors, and lithium‐ion batteries) over the past decade. This review first introduces the main self‐healing mechanisms among different materials including insulators, electrical conductors, semiconductors, and ionic conductors. Then, the basic concepts, fabrication techniques, and healing performances of the newly developed self‐healing energy harvesting (nanogenerators and solar cells) and storage (supercapacitors and lithium‐ion batteries) devices are described in detail. Finally, the existing challenges and promising solutions of self‐healing materials and devices are discussed.

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Ultrareproducible Capacitive Soft Pressure Sensor Using a Self‐Integrated Fibrous Network of Urethane Equipped with Diels–Alder Adducts

et al. 2021

Self Cite

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A pressure sensor based on a composite structure comprising air and polymer fibers is suggested to develop a capacitive pressure sensor that is virtually unaffected by repeated pressurization. Reversibly cross‐linkable urethane (RCU) derived from polybutadiene is newly synthesized for electrospinning, which exhibits the Diels–Alder (DA) reaction under mild conditions. RCU‐based microfibril film is fabricated and it succeeds in welding the intersections of the fibers without a collapse of their shape at mild temperature. This is accomplished via the DA reaction to prevent shearing between microfibrils when physical stress is applied to the film. The porous film is mechanically robust and reacts stably when the film is deformed or pressed. Electrodes are formed on both surfaces of the film using Ag nanowires (AgNWs). Vapor‐assisted partial melting of retro‐DA adducts is used to promote fusion of the polymer through the surface of the AgNWs and implement a robust stretchable electrode. The capacitance changes exceptionally uniformly with the magnitude of the applied pressure and deformation. Using this sensor, its functionality is successfully demonstrated by implementing a pressure sensor array composed of 9 px and measuring the external force applied to the balloon injected with air.

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Extremely rapid and simple healing of a transparent conductor based on Ag nanowires and polyurethane with a Diels–Alder network

Abstract: A transparent electrode comprising Ag nanowires and a polyurethane equipped with Diels–Alder adducts as crosslinkers was successfully fabricated to realize a rapidly amendable electrode.

Cited by 58 publications

References 34 publications

Interfaceless Strain and Pressure‐Sensitive Stretchable Capacitor Based on Self‐Bonding and Surface Morphology Control of a Reversibly Crosslinkable Silicone Elastomer

Interfaceless Strain and Pressure‐Sensitive Stretchable Capacitor Based on Self‐Bonding and Surface Morphology Control of a Reversibly Crosslinkable Silicone Elastomer

Self‐Healing Materials for Next‐Generation Energy Harvesting and Storage Devices

Ultrareproducible Capacitive Soft Pressure Sensor Using a Self‐Integrated Fibrous Network of Urethane Equipped with Diels–Alder Adducts

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