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Transfer of Chemically Modified Graphene with Retention of Functionality for Surface Engineering
Keith E Whitener1, Woo-Kyung Lee1, Nabil D Bassim1
1Chemistry Division, ‡Materials Science and Technology Division, and §Electronic Science and Technology Division, U.S. Naval Research Laboratory , Washington, D.C. 20375, United States.
Nano Letters
|January 20, 2016
Summary
Chemically modified graphene (CMG) can be transferred to new substrates using a Birch reduction process. This method preserves functional groups, enabling diverse applications in materials science.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Graphene's unique properties make it attractive for advanced applications.
- Transferring functionalized graphene to various substrates is challenging.
- Previous methods often resulted in loss of chemical modifications.
Purpose of the Study:
- To develop a reliable method for transferring chemically modified graphene (CMG).
- To investigate the retention of functional groups during graphene transfer.
- To demonstrate the utility of transferred CMG for specific applications.
Main Methods:
- Single-layer graphene was chemically reduced using the Birch process.
- Delamination from Si/SiOx substrates was induced using an ethanol/water mixture.
- Transfer to diverse substrates (metals, dielectrics, polymers) was performed.
- Characterization included magnetic force microscopy and thermal dehydrogenation.
Main Results:
- The Birch process enabled delamination of graphene from Si/SiOx.
- Hydrogen, methyl, and aryl functional groups were retained during transfer.
- Magnetic properties of hydrogenated graphene were preserved post-transfer.
- A polymer- and etchant-free transfer method was demonstrated for TEM applications.
Conclusions:
- Birch reduction facilitates CMG delamination by weakening van der Waals forces.
- The developed transfer method preserves chemical functionalities, enabling substrate functionalization.
- This technique offers a versatile route for integrating functionalized graphene into various devices and applications.
