Dry transfer of graphene to dielectrics and flexible substrates using polyimide as a transparent and stable intermediate layer
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We demonstrate the direct transfer of graphene from Cu foil to glass and flexible substrates such as PET, using polyimide (PI) mixed with an aminosilane (3-aminopropyltrimethoxysilane) or only PI, respectively, as intermediate layer. We probe the scalability and roll-to-roll processing of this technique by using two different equipment: hot press and a laminator. High quality, clean and continuous areas of graphene monolayer can be transferred with the advantage of Cu recycling for future growth catalyst as it is peeled-off mechanically from the substrate/PI/graphene structure. More important are the high transparency of the samples together with the electron doping achieved (n<sub>S</sub>= 0.21 to 4 x 10<sup>13</sup> cm<sup>-2</sup>), as the performing graphene face is not in direct contact with PMMA, PI or other materials, and the high mobility (µ<sub>H</sub> up to 1250 cm<sup>2</sup>/Vcenterdots). Stability of the structure in terms of sheet resistance (R<sub>S</sub>) at high temperatures, bending cycles and water immersion make this technique promising for future applications and implementation at the large scale.
CitationMarchena, M. [et al.]. Dry transfer of graphene to dielectrics and flexible substrates using polyimide as a transparent and stable intermediate layer. "2D Materials", 30 Abril 2018.