Individually Position‐Addressable Metal‐Nanofiber Electrodes for Large‐Area Electronics

Lee, Yeongjun; Kim, Tae-Sik; Min, Sung‐Yong; Xu, Wentao; Jeong, Seong Mok; Seo, H.S.; Lee, Tae‐Woo

doi:10.1002/adma.201403559

Cited by 53 publications

(49 citation statements)

References 54 publications

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“…To achieve this functionality, we suggest a patternable and foldable substrate using our CNF hybrid film. Although many previous studies have reported on stretchable interconnects using graphene, 35 metal nanowires, 36 metal nanofiber, 37,38 and geometrical approaches, 39 conventional electronic devices fabricated on the elastomeric substrate are easily broken because most of the semiconductor, dielectric and encapsulation materials are still brittle. Therefore, the approach using origami substrates made of strain-free rigid plates with reversibly foldable and stretchable, elastomeric joints 40 has been considered as a promising strategy for stretchable electronics.…”

Section: Demonstration Of a Transparent Oled On The Hybrid Filmmentioning

confidence: 99%

Photo-patternable and transparent films using cellulose nanofibers for stretchable origami electronics

Hyun

Kim

et al. 2016

NPG Asia Mater

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Substantial progress in flexible or stretchable electronics over the past decade has extensively impacted various technologies such as wearable devices, displays and automotive electronics for smart cars. An important challenge is the reliability of these deformable devices under thermal stress. Different coefficients of thermal expansion (CTE) between plastic substrates and the device components, which include multiple inorganic layers of metals or ceramics, induce thermal stress in the devices during fabrication processes or long-term operations with repetitions of thermal cyclic loading-unloading, leading to device failure and reliability degradation. Here, we report an unconventional approach to form photo-patternable, transparent cellulose nanofiber (CNF) hybrid films as flexible and stretchable substrates to improve device reliability using simultaneous electrospinning and spraying. The electrospun polymeric backbones and sprayed CNF fillers enable the resulting hybrid structure to be photolithographically patternable as a negative photoresist and thermally and mechanically stable, presenting outstanding optical transparency and low CTE. We also formed stretchable origami substrates using the CNF hybrid that are composed of rigid support fixtures and elastomeric joints, exploiting the photo-patternability. A demonstration of transparent organic light-emitting diodes and touchscreen panels on the hybrid film suggests its potential for use in next-generation electronics.

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Section: Demonstration Of a Transparent Oled On The Hybrid Filmmentioning

confidence: 99%

Photo-patternable and transparent films using cellulose nanofibers for stretchable origami electronics

Hyun

Kim

et al. 2016

NPG Asia Mater

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“…Pyrolysis of binding polymer and metal fiber‐like precursors along with concurrent nucleation and growth of metal nanoparticles is the common strategy to prepared orderly aligned metal nanowire arrays or grids. After devoting tremendous efforts to examining many kinds of viscous binding polymers and Cu precursors, Lee et al succeeded in transforming electrospun poly(vinylpyrollidone) (PVP) and Cu(II) trifluoroacetate (Cu(CO 2 CF 3 ) 2 , CTA) composite nanofibers into polycrystalline copper nanowire (CuNWs) based on EHD nanowire printing (ENP, another name of MES), shown in Figure a,b. The polymer and precursor components are decomposed in the air during the first step (500 °C, 1 h), leading to the formation of CuO nanowires as indicated by the energy dispersive X‐ray spectroscopy (EDXS) spectra in Figure c.…”

Section: Applications Via Ehd Direct‐writingmentioning

confidence: 99%

Section: Applications Via Ehd Direct‐writingmentioning

confidence: 99%

Large‐Scale Direct‐Writing of Aligned Nanofibers for Flexible Electronics

Ding

Duan

et al. 2018

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135

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Nanofibers/nanowires usually exhibit exceptionally low flexural rigidities and remarkable tolerance against mechanical bending, showing superior advantages in flexible electronics applications. Electrospinning is regarded as a powerful process for this 1D nanostructure; however, it can only be able to produce chaotic fibers that are incompatible with the well-patterned microstructures in flexible electronics. Electro-hydrodynamic (EHD) direct-writing technology enables large-scale deposition of highly aligned nanofibers in an additive, noncontact, real-time adjustment, and individual control manner on rigid or flexible, planar or curved substrates, making it rather attractive in the fabrication of flexible electronics. In this Review, the ground-breaking research progress in the field of EHD direct-writing technology is summarized, including a brief chronology of EHD direct-writing techniques, basic principles and alignment strategies, and applications in flexible electronics. Finally, future prospects are suggested to advance flexible electronics based on orderly arranged EHD direct-written fibers. This technology overcomes the limitations of the resolution of fabrication and viscosity of ink of conventional inkjet printing, and represents major advances in manufacturing of flexible electronics.

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“…[1][2][3][4][5] Among a variety of chemical approaches to deriving high-performance printable electrodes, the metallic nanoparticle-based strategy is recognized as the most achievable one, in terms of a facile synthetic pathway, low-temperature processability, high electrical conductivity, and chemical/environmental stability. 6 In particular, when electrical conductivity is a primary requisite, the metallic nanoparticles have a crucial advantage over organometallic precursors and conductive polymers.…”

Section: Introductionmentioning

confidence: 99%

Newly Designed Cu/Cu₁₀Sn₃ Core/Shell Nanoparticles for Liquid Phase-Photonic Sintered Copper Electrodes: Large-Area, Low-Cost Transparent Flexible Electronics

Kim

et al. 2016

Chem. Mater.

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The conductive nanomaterials applicable to unconventional printing techniques have attracted the tremendous attention, and in particular, cost-effective copper-based electrode materials have been recognized a viable candidate to replace the expensive silver counterpart. In this study, we synthesize newly-designed Cu core/Cu 10 Sn 3 shell nanoparticles, as an additive material for overcoming the critical drawbacks in Cu nanoparticle-based electrodes, in combination with a large-area processable, continuous photonic sintering process in a time scale of 10 -3 sec. By virtue of a low melting-point nature of Cu 10 Sn 3 phase, the facile electrode fabrication process is easily triggered, evolving the resistivities of 27.8 and 12.2 µΩ·cm under energy dose conditions of 0.97 and 1.1 J/cm 2 , respectively, at which highly conductive electrodes are not obtainable from phase-pure Cu nanoparticles. The mixture suspension of Cu and Cu/Cu 10 Sn 3 nanoparticles enables for roll-to-roll processable, highly uniform Cu-based electrodes (with a sheet resistance and a standard deviation of 1.21 and 0.29 Ω/square, respectively) even on vulnerable polyethylene naphthalate (PEN) substrate, while the electrodes derived from Cu 10 Sn 3 phase-free Cu nanoparticles suffer from non-uniform characteristics and even a partially insulating nature.The practical applicability of Cu/Cu 10 Sn 3 core/shell nanoparticles is demonstrated with the fabrication of a touch screen panel and an antenna for wireless power transmission.

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Individually Position‐Addressable Metal‐Nanofiber Electrodes for Large‐Area Electronics

Cited by 53 publications

References 54 publications

Photo-patternable and transparent films using cellulose nanofibers for stretchable origami electronics

Photo-patternable and transparent films using cellulose nanofibers for stretchable origami electronics

Large‐Scale Direct‐Writing of Aligned Nanofibers for Flexible Electronics

Newly Designed Cu/Cu₁₀Sn₃ Core/Shell Nanoparticles for Liquid Phase-Photonic Sintered Copper Electrodes: Large-Area, Low-Cost Transparent Flexible Electronics

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Individually Position‐Addressable Metal‐Nanofiber Electrodes for Large‐Area Electronics

Cited by 53 publications

References 54 publications

Photo-patternable and transparent films using cellulose nanofibers for stretchable origami electronics

Photo-patternable and transparent films using cellulose nanofibers for stretchable origami electronics

Large‐Scale Direct‐Writing of Aligned Nanofibers for Flexible Electronics

Newly Designed Cu/Cu10Sn3 Core/Shell Nanoparticles for Liquid Phase-Photonic Sintered Copper Electrodes: Large-Area, Low-Cost Transparent Flexible Electronics

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Product

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Newly Designed Cu/Cu₁₀Sn₃ Core/Shell Nanoparticles for Liquid Phase-Photonic Sintered Copper Electrodes: Large-Area, Low-Cost Transparent Flexible Electronics