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Polymer-Free Gradient-Etching Transfer of Freestanding Monolayer Graphene
Feng Gu1, Xiao-Long Lv1, Peng-Ju Yang1
1Department of Physics, State Key Laboratory of Surface Physics and Key Laboratory of Micro- and Nano-Photonic Structures (MOE), Fudan University, Shanghai 200433, China.
ACS Applied Materials & Interfaces
|May 1, 2026
Summary
A novel polymer-free graphene transfer method uses gradient etching to create large, defect-free monolayer graphene sheets. This technique enables advanced applications in spectroscopy and device fabrication by providing clean, freestanding graphene films.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Conventional graphene transfer methods often result in defects due to polymer residues and substrate etching.
- Achieving large-scale, high-quality monolayer graphene is crucial for advanced electronic and optical applications.
Purpose of the Study:
- To develop a polymer-free graphene transfer method for fabricating centimeter-scale, substrate-free monolayer graphene.
- To enable clean graphene transfer for intrinsic interface studies and device fabrication.
Main Methods:
- A gradient-etching strategy was employed for unidirectional copper (Cu) substrate removal.
- Two gradient etching techniques were explored: electrochemically assisted etching and flow-assisted etching.
- Freestanding graphene was released onto a liquid surface, minimizing tearing and fragmentation.
Main Results:
- Centimeter-scale, substrate-free monolayer graphene was successfully fabricated.
- The gradient etching strategy prevented tearing and fragmentation common in conventional methods.
- The resulting freestanding graphene demonstrated gate-tunable electrode properties suitable for spectroscopy.
Conclusions:
- The reported polymer-free gradient-etching method provides a versatile platform for high-quality graphene fabrication.
- This technique facilitates fundamental studies of interfaces and the development of high-performance graphene-based devices.
- The method allows for further tailoring of graphene properties through in situ nanoparticle deposition.
