Roll-based damage-free transfer technique for large-area 2D nanomaterials (IMAGE)

National Research Council of Science & Technology

Roll-based damage-free transfer technique for large-area 2D nanomaterials

Caption

(1-1) Dr. Kwang-Seop Kim and his research team at the Department of Nano-Mechanics, KIMM, have succeeded in developing the roll-based damage-free transfer technique for 2D nanomaterial (monolayer graphene). <br><br> (1-2) Dr. Kwang-Seop Kim and his research team at the Department of Nano-Mechanics, KIMM, have revealed a damage mechanism of roll-based transfer process for 2D nanomaterials. If the adhesive layer is too thin, damage occurs to the 2D nanomaterials from adhesion instability; and if the adhesive layer is too thick, the contact pressure during the transfer process causes excessive deformation, causing damage to the materials. <br><br> (1-3) Dr. Kwang-Seop Kim and his research team at the Department of Nano-Mechanics, KIMM, have succeeded in designing a transfer film with an optimally thick adhesive layer, and applied it to the roll-based transfer process to successfully transfer 2D nanomaterial (monolayer graphene) to the desired substrate without damage. <br><br> (1-4) A graph showing the sheet-resistance quality of 2D nanomaterial (monolayer graphene) based transparent electrodes, produced by the roll-based transfer technique. The lower the sheet resistance, the better it conducts electricity to transparent electrode (monolayer graphene); and the more uniformed the sheet resistance quality, the better one can make large-scale transparent electrode. <br><br> When the adhesive layer is thin, the sheet resistance is extremely high at 1130 Ohm/sq., and the sheet resistance quality is non-uniform. When the adhesive layer is thick, the sheet resistance is 563 Ohm/sq., and the sheet resistance quality is again non-uniform. When using the transfer film designed to have an optimally thick adhesive layer, the sheet resistance is very low at 235 Ohm/sq., and the sheet resistance quality is uniform.

Credit

The Korea Institute of Machinery and Materials (KIMM)

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