[논문]Unprecedented flexibility of in-situ layer-by-layer stacked graphene with ultralow sheet resistance

Han, Yire; Eom, Ji-Ho; Jung, Jang-Su; Yoon, Soon-Gil

doi:10.1016/j.nantod.2021.101105

[해외논문] Unprecedented flexibility of in-situ layer-by-layer stacked graphene with ultralow sheet resistance

Nano today, v.37, 2021년, pp.101105 -

Han, Yire (Corresponding author.) , Eom, Ji-Ho , Jung, Jang-Su , Yoon, Soon-Gil

Abstract ▼ AI-Helper

Abstract Although graphene has been extensively studied as a candidate transparent conducting electrode (TCE) material for next-generation flexible devices, transferred large-scale graphene inevitably suffers from wrinkles, ripples, and metallic residues, which significantly lowers its quality by increasing its resistance and reducing its flexibility under tensile strain. As a result, many studies have looked to decrease the sheet resistance and increase the flexibility of graphene, but the complicated fabrication processes and high costs involved are barriers to commercialization. In the present study, 4 in. scale monolayered graphene and layer-by-layer stacked graphene that do not require a transfer process were designed to exhibit high flexibility and ultra-low sheet resistance. Three-layered stacked graphene film grown in situ on a polyethylene terephthalate substrate had an ultra-low sheet resistance of ~ 16 Ω sq−1 at an optical transmittance of ~ 93% and superior flexibility for 104 cycles under a tensile strain of 5%. However, the plastic deformation of the PET substrate considerably reduced the flexibility of the monolayered graphene. In contrast, monolayered graphene on polydimethylsiloxane, which did not undergo plastic deformation, exhibited unprecedented flexibility at a static tensile strain of 15% (radius of curvature: 0.6 mm) and for 3 × 104 bending cycles under a tensile strain of 11% (radius of curvature: 0.9 mm). This study provides an effective approach for the fabrication of TCEs for use in foldable electronic devices. Highlights Monolayer graphene grown directly on 10 nm-thick Ti-buffered PET and PDMS substrates at 100 °C. In situ three-layered stacked graphene with ~ 16 Ω sq−1 at an optical transmittance of 93%. Strong dependency of flexibility of single-layered graphene on substrates. Excellent flexibility of single-layered graphene at a tensile strain of 15%. Superb mechanical performance of the graphene for 3 × 104 cycles at a tensile strain of 11%. Graphical Abstract Flexibility of single-layered graphene was investigated at various tensile strains using PET, PDMS/PET, and PDMS flexible substrates. The single-layered graphene grown directly on PDMS substrate at 100 °C exhibited an excellent flexibility at (a) a static tensile strain of 15% (radius of curvature: 0.6 mm) and (b) for 3 × 104 cycles at a tensile strain of 11% (radius of curvature: 0.9 mm). [DISPLAY OMISSION]

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DOI : 10.1016/j.nantod.2021.101105
Elsevier : 저널 > 논문

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