|Posted: Nov 09, 2017|
Key to direct graphene transfer is the control of water intercalation(Nanowerk News) In new work, reported in ACS Applied Materials & Services ("Controlling Water Intercalation Is Key to a Direct Graphene Transfer"), researchers in Belgium demonstrate that interfacial water can insert between graphene and its growth substrate despite the hydrophobic behavior of graphene.
|In their paper, the researchers discuss in detail graphene delamination from platinum (Pt) surfaces using electrochemical methods. They show that water intercalation between graphene and a Pt surface is critical to achieve a successful graphene delamination using an electrochemical method.|
|They also demonstrate that intercalation effects can occur between graphene and a target wafer, resulting in unwanted graphene delamination effects.|
|The proposed process. (© ACS)|
|Exposing a platinum/graphene sample for several days to ambient conditions or submerging it in warm ultrapure water gradually changes the graphene surface morphology and varies the chemical composition of the graphene/Pt interface.|
|The results are consistent with water intercalation, which progressively develops at the interface. This intercalation process is essential to obtain a successful electrochemical graphene delamination procedure.|
|Furthermore, the team established a direct graphene transfer process on the basis of interfacial water between graphene and the CVD growth substrate and of avoiding water intercalation between the hydrophobic target wafer and graphene.|
|Such a direct graphene transfer avoids polymer contamination (no temporary support layer) and etching of the catalyst metal. As a result, recycling of the growth template becomes feasible.|
|"Since the interaction between graphene and water is comparable to the interaction between MoS2 and water, a transfer procedure based on controlling water intercalation might also work for other 2D materials like MoS2," the authors conclude their report. "As a result, the proposed transfer process might even open the door for the predicted atomic-scale interlocking-toy-brick stacking of different hydrophobic 2D materials."|
|By Michael Berger – Michael is author of two books by the Royal Society of Chemistry: Nano-Society: Pushing the Boundaries of Technology and Nanotechnology: The Future is Tiny.|
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