A high-performance, flexible and robust metal nanotrough-embedded transparent conducting film for wearable touch screen panels

Im, Hyeon‐Gyun; An, Byeong Wan; Jin, Jungho; Jang, Junho; Park, Young‐Geun; Park, Jang Ung; Bae, Byung Seong

doi:10.1039/c5nr07657a

Cited by 74 publications

(54 citation statements)

References 37 publications

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“…The electrical conducting properties of metallic nanomaterials can be better than ITO . Silver micro/nanoflakes and nanowire‐based conducting inks are commonly used as conductive elements . The printed ink tracks can reach 13 mΩ sq −1 at 85% optical transmittance, and the metal nanofibers can reach 1.3 ± 0.2 Ω sq −1 at 90% optical transmittance .…”

Section: Introductionmentioning

confidence: 99%

“…Silver micro/nanoflakes and nanowire‐based conducting inks are commonly used as conductive elements . The printed ink tracks can reach 13 mΩ sq −1 at 85% optical transmittance, and the metal nanofibers can reach 1.3 ± 0.2 Ω sq −1 at 90% optical transmittance . Silver nanoparticles have been shown to give similar resistivity at about 4 µm ink thickness .…”

Section: Introductionmentioning

confidence: 99%

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Laser Direct Writing of Heteroatom (N and S)‐Doped Graphene from a Polybenzimidazole Ink Donor on Polyethylene Terephthalate Polymer and Glass Substrates

Huang

Zeng

Liu

et al. 2018

Small

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In this paper, for the first time, a laser direct writing technique is reported to form S‐ and N‐doped graphene patterns on thin (0.3 mm thickness) polyethylene terephthalate (PET) and glass substrates from a specially formulated organic polybenzimidazole (PBI) ink, without thermally affecting the substrates and without the need for a metallic precursor. Unlike standard graphene ink printing, postcuring at high temperatures is not needed here, thus avoiding potential substrate distortion and damages. A UV laser beam of 355 nm wavelength is used to generate photochemical reactions to break the CS bond (2.8 eV) from dimethyl sulfoxide (DMSO, a component of the PBI ink) and the CN bond (3.14 eV) of PBI and form N‐ and S‐doped graphene on the substrates. The sheet resistance of the laser‐induced graphene is as low as 12 Ω sq−1 on PET, matching that of indium–tin oxide (ITO). The laser‐written doped graphene shows hydrophilic characteristics, unlike pristine graphene. The S‐ and N‐doped graphene allows the tailoring of bandgaps and thus controlling electrical and chemical properties. The optical transparency of the written graphene is below 10% which could be improved in the future. Potential applications include printing of flexible circuits and sensors, and smart wearables.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser Direct Writing of Heteroatom (N and S)‐Doped Graphene from a Polybenzimidazole Ink Donor on Polyethylene Terephthalate Polymer and Glass Substrates

Huang

Zeng

Liu

et al. 2018

Small

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“…In addition, a polyvinyl pyrrolidone (PVP) insulating layer, less than 50 nm thick, on the AgNW surface ( Figure 3e) interferes with the flow of the current, but as a result of the calendering process, stable connections are formed between the AgNWs penetrating the PVP layer while the AgNWs are stably attached to the substrate. 5 of the roll temperature is 0.002, clearly indicating the tendency of the sheet resistance. The AgNWs are crushed by the calendering roll and the PVP layer surrounding the AgNWs is broken by the pressure.…”

Section: Calendering Effectmentioning

confidence: 89%

Fabrication of Transparent Conductive Film with Flexible Silver Nanowires Using Roll‐to‐Roll Slot‐Die Coating and Calendering and Its Application to Resistive Touch Panel

Jeong

Park

Lee

et al. 2018

Adv Elect Materials

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A transparent conductive film incorporating silver nanowires (AgNW TCF) is fabricated through roll‐to‐roll (R2R) slot‐die coating and a subsequent calendering process and applied to a resistive touch panel. To produce a uniform AgNW film on a flexible polyethylene terephthalate substrate, the R2R slot‐die coating is optimized in terms of the solvent, concentration, and flow rate of the AgNW solution, and the length of the AgNWs synthesized using a polyol method. The coated AgNW TCF is calendered between two rolls to produce percolation paths in the film. During the calendering, the roll temperature, applied pressure, and web speed are optimized to yield a low sheet resistance of 28 Ω sq−1 with a transmittance of 86% at 550 nm. To demonstrate the functionality of the AgNW TCF, a coating of SiO2 microspheres is also applied to form a spacer layer, again using R2R slot‐die coating. A resistive touch panel is thus successfully implemented. The effect of the calendering process is confirmed by observing the operation of the touch panel, which is found to be more sensitive and accurate. The integrated manufacturing process for producing an AgNW TCF, presented herein, can be applied to many other major fields.

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“…1D metal nanotroughs is another option for wearable optoelectronic sensors because of their good mechanical properties and low sheet resistance (10 Ω sq −1 ) and high transparency (≈90%). However, metal nanotroughs have challenges of poor adhesion properties with substrates, surface roughness, and incompatibility to thermal processing . To overcome such challenges, An et al found 1D metallic nanotroughs using CuZr and metallic glasses (MGs) that have low sheet resistance (3.8 Ω sq −1 ), with an acceptable duration against mechanical deformation of 70% tensile strain .…”

Section: Advanced Strategies For Wearable Smart Sensing Systems Basedmentioning

confidence: 99%

Smart Sensing Systems Using Wearable Optoelectronics

Hwang

et al. 2020

Advanced Intelligent Systems

Self Cite

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A wearable smart sensing system is capable of continuously monitoring biometric information such as respiration, pulse, and body temperature while attached to an arbitrary surface on the user's body to be utilized freely during activities. Research conducted on new materials, fabrication processes, structure of electrodes, and wireless communication technologies has made constant progress in the development of smart sensing systems that use entirely wearable forms of devices to go beyond conventional devices that are based on intrinsically rigid components, such as silicon. Among various platforms that can be used in the development of smart sensing systems, optoelectronics provides innovative sensing functions (e.g., human–machine interfaces and phototherapy) that can be transferred from traditional healthcare to smart healthcare, such as point of care. Optoelectronics are light‐mediated displays that allow a light source to be controlled and a large light spectrum to be detected. Recently, this platform that uses smart and wearable optoelectronic sensing systems has become increasingly advanced to better help human beings treat their diseases through self‐healthcare. Herein, recent advanced technologies in materials, structures, and wireless platforms for smart sensors using wearable optoelectronics are reviewed.

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A high-performance, flexible and robust metal nanotrough-embedded transparent conducting film for wearable touch screen panels

Cited by 74 publications

References 37 publications

Laser Direct Writing of Heteroatom (N and S)‐Doped Graphene from a Polybenzimidazole Ink Donor on Polyethylene Terephthalate Polymer and Glass Substrates

Laser Direct Writing of Heteroatom (N and S)‐Doped Graphene from a Polybenzimidazole Ink Donor on Polyethylene Terephthalate Polymer and Glass Substrates

Fabrication of Transparent Conductive Film with Flexible Silver Nanowires Using Roll‐to‐Roll Slot‐Die Coating and Calendering and Its Application to Resistive Touch Panel

Smart Sensing Systems Using Wearable Optoelectronics

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