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Phosphate Triggers Spontaneous Delamination at the Graphene-ITO Interface
Ning Ding1, Wen-Li Lv1, Xiaona Zhao1
1Hefei National Research Center for Physical Sciences at the Microscale, State Key Lab of Advanced Environmental Technology, School of Environment, University of Science and Technology of China, Hefei, 230026, China.
Nano Letters
|June 8, 2026
Summary
Phosphate causes graphene to detach from indium tin oxide (ITO) in acidic solutions, unlike other anions. This anion-specific failure impacts graphene/oxide interface stability in devices.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Graphene/metal oxide interfaces are crucial for electronic devices.
- Their stability in electrolytes is not well understood.
- Phosphate's role at graphene-ITO interfaces is unclear.
Purpose of the Study:
- Investigate the stability of graphene/indium tin oxide (ITO) interfaces in electrolyte solutions.
- Determine the specific role of phosphate anions in interfacial degradation.
- Understand the mechanism of graphene delamination from ITO.
Main Methods:
- Low-angle rotational interferometric scattering microscopy to visualize delamination.
- Spectroscopy, contact angle measurements, and ion dissolution analysis.
- Density functional theory (DFT) calculations to model interfacial interactions.
Main Results:
- Phosphate anions induce spontaneous delamination of graphene from ITO in acidic conditions.
- Chloride, sulfate, and nitrate anions do not cause similar delamination.
- Delamination rate is dependent on phosphate concentration and pH.
- Phosphate associates with indium sites, promoting indium dissolution and weakening adhesion.
Conclusions:
- Phosphate is an active species that destabilizes graphene/ITO interfaces.
- Anion-specific interfacial failure pathways exist for graphene/oxide systems.
- Understanding this mechanism is vital for designing stable graphene-based devices.
