Simple method to transfer graphene from metallic catalytic substrates to flexible surfaces without chemical etching

Ko, Pil Ju; Takahashi, Hidenori; Koide, Shigeyo; Sakai, Hiroki; Thu, Tran Viet; Okada, Hiroshi; Sandhu, Adarsh

doi:10.1088/1742-6596/433/1/012002

Cited by 16 publications

(12 citation statements)

References 16 publications

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“…We attribute this high durability to the stronger adhesion force of PDMS-graphene compared to graphene-graphene that act as top and bottom electrodes. [39][40][41] Furthermore, in our experimental procedure, a liquid PDMS mixture was cured after coating it onto the graphene surface. Because of intimate molecular contact between PDMS and graphene resulting from the conformal coating of the liquid PDMS, van-der Waals interaction would be maximized.…”

Section: Communicationmentioning

confidence: 99%

Linearly and Highly Pressure‐Sensitive Electronic Skin Based on a Bioinspired Hierarchical Structural Array

et al. 2016

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Pressure-sensitive electronic skin composed of a hierarchical structural array exhibits outstanding linear and high sensitivity in the pressure range exerted by gentle touch. By virtue of monolayer graphene acting as electrode material, this device can be operated with low voltage. Especially, its high transparency enables an accurate placement of the device on the target position when it is used for health monitoring.

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Section: Communicationmentioning

confidence: 99%

Linearly and Highly Pressure‐Sensitive Electronic Skin Based on a Bioinspired Hierarchical Structural Array

et al. 2016

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“…The indirect transfer technique is well suited for transferring graphene from uneven Cu surfaces because it protects the graphene with a poly(methyl methacrylate) (PMMA) layer during the transfer process and provides structural stability over a large area while mitigating against the defects in the nanoscale Cu‐graphene substrate surface as it is moved to an arbitrary substrate. [ 12–14 ] The phenomenon was previously described as the formation of surface wrinkles that occur due to the initial surface corrugation conditions of the Cu‐graphene substrate. [ 12,15 ]…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Highly Area‐Mismatched Graphene‐to‐Substrate Transfers and the Predictability of Wrinkle Formation in Graphene for Stretchable Electronics

Wimalananda

Kim

Lee

2020

Adv Materials Inter

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profile, these wrinkles can remain even after transfer. [12] Moreover, during the transfer process, the surface height profile of the graphene-Cu surface can create an extra area difference in relation to the projected area. On the other hand, a slight area mismatch between the graphene-Cu and transfer substrate can be used to produce an ultra-flat graphene transfer. [13] In order to achieve this, we need long-wavelength, small amplitude corrugations or roughness (low profile morphological conditions) or ultra-short corrugations in the transfer substrates and/or graphene-Cu substrate. Under these conditions, ultraflattening is achieved by tensile mismatch strain. [13] However, the conventional surface features found in Cu foils such as high-profile rolling lines, high surface steps, and other scratch marks formed during the manufacturing process are at odds with the morphological conditions needed to achieve ultra-flat graphene transfer. The objective of highly area-mismatched graphene transfer is mainly focused on avoiding defects, such as cracks, during the transfer process rather than achieving especially smooth transferred graphene film. The indirect transfer technique is well suited for transferring graphene from uneven Cu surfaces because it protects the graphene with a poly(methyl methacrylate) (PMMA) layer during the transfer process and provides structural stability over a large area while mitigating against the defects in the nanoscale Cu-graphene substrate surface as it is moved to an arbitrary substrate. [12-14] The phenomenon was previously described as the formation of surface wrinkles that occur due to the initial surface corrugation conditions of the Cu-graphene substrate. [12,15] Currently, existing graphene-based stretchable electrodes have mainly focus on substrate-controlled designs; stretchable 2D designs based on an etching or selective growth technique or 3D stretchable designs with a supporting top layer. [16-21] The main concept of supporting electrical conductivity under stretchable conditions includes the use of a compressively strained electrode for stretching applications where the electrode becomes unstrained without structural damage when the electrode is in its stretched state. [18,21] Graphene is an extraordinarily good fit for such applications because of its superior flexibility and its mechanical stability as a nanomaterial.

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“…Recent studies have demonstrated direct transfer of graphene on PET substrate based on selective dewetting; however, this method requires UV curable adhesive 35,52 . Similarly, CVD grown graphene was also transferred to PVA through drop casting and lamination 53 and to PDMS surface via drop casting and peeling approach with low transfer efficiency 54 . There are some other studies reporting the direct transfer of conductive silver using polymer casting 55 ; however, transfer of graphene via simple polymer casting directly to the target polymeric substrate could be an alternative, simple, fast, green and cost-effective approach allowing the use of variety of flexible substrate materials and eliminating the aforementioned processing steps.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of High-resolution Graphene-based Flexible Electronics via Polymer Casting

Jackson

Donta

et al. 2019

Sci Rep

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In this study, a novel method based on the transfer of graphene patterns from a rigid or flexible substrate onto a polymeric film surface via solvent casting was developed. The method involves the creation of predetermined graphene patterns on the substrate, casting a polymer solution, and directly transferring the graphene patterns from the substrate to the surface of the target polymer film via a peeling-off method. The feature sizes of the graphene patterns on the final film can vary from a few micrometers (as low as 5 µm) to few millimeters range. This process, applied at room temperature, eliminates the need for harsh post-processing techniques and enables creation of conductive graphene circuits (sheet resistance: ~0.2 kΩ/sq) with high stability (stable after 100 bending and 24 h washing cycles) on various polymeric flexible substrates. Moreover, this approach allows precise control of the substrate properties such as composition, biodegradability, 3D microstructure, pore size, porosity and mechanical properties using different film formation techniques. This approach can also be used to fabricate flexible biointerfaces to control stem cell behavior, such as differentiation and alignment. Overall, this promising approach provides a facile and low-cost method for the fabrication of flexible and stretchable electronic circuits.

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Simple method to transfer graphene from metallic catalytic substrates to flexible surfaces without chemical etching

Cited by 16 publications

References 16 publications

Linearly and Highly Pressure‐Sensitive Electronic Skin Based on a Bioinspired Hierarchical Structural Array

Linearly and Highly Pressure‐Sensitive Electronic Skin Based on a Bioinspired Hierarchical Structural Array

Characteristics of Highly Area‐Mismatched Graphene‐to‐Substrate Transfers and the Predictability of Wrinkle Formation in Graphene for Stretchable Electronics

Fabrication of High-resolution Graphene-based Flexible Electronics via Polymer Casting

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