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Crystal Orientation Dependent Oxidation Modes at the Buried Graphene-Cu Interface
Philipp Braeuninger-Weimer1, Oliver J Burton1, Patrick Zeller2
1Department of Engineering, University of Cambridge, Cambridge CB3 0FA, United Kingdom.
Chemistry of Materials : a Publication of the American Chemical Society
|September 28, 2020
Summary
We found four distinct oxidation modes at the graphene-copper interface, influenced by copper
Area of Science:
- Materials Science
- Surface Science
- Nanotechnology
Background:
- The interface between graphene and copper (Cu) is crucial for 2D material applications.
- Understanding graphene-Cu interface oxidation is vital for device stability and scalability.
- Copper crystallographic orientation's effect on interface oxidation remains underexplored.
Purpose of the Study:
- To investigate the relationship between copper crystallographic orientation and buried graphene-Cu interface oxidation.
- To characterize different oxidation modes and their underlying mechanisms.
- To provide insights for advanced 2D material interface engineering.
Main Methods:
- Spatially resolved scanning photoelectron spectroscopy.
- Confocal Raman microscopy.
- Optical microscopy.
- Analysis of over 100 graphene-covered Cu orientations exposed to air for two years.
Main Results:
- Identified four general oxidation modes: complete, irregular, inhibited, and enhanced wrinkle interface oxidation.
- Mapped these oxidation modes onto a polar plot of Cu surface orientations.
- Demonstrated a clear correlation between Cu crystallographic orientation and oxidation behavior.
Conclusions:
- Copper crystallographic orientation significantly dictates the oxidation modes at the buried graphene-Cu interface.
- This understanding is critical for optimizing graphene-Cu interfaces in applications like scalable transfer, electronic contacts, encapsulation, and corrosion protection.
- Findings contribute to the broader field of 2D material interface engineering.
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