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Updated: Feb 26, 2026

Scalable Syntheses of Graphene Oxide and Reduced Graphene Oxide using Cascade Design Oxidation and Highly Basic Reduction Reactions
Published on: July 3, 2025
Local oxidation and reduction of graphene
Yi-Zhe Hong1, Wei-Huan Chiang1, Hung-Chieh Tsai1
1Department of Physics, National Central University, Jungli, 32054, Taiwan, Republic of China.
Scanning probe lithography (SPL) creates oxidation patterns in graphene, crucial for controlling oxygen coverage. Focused x-ray beams then reduce these patterns, with C-C → C=C being the limiting reduction step.
Area of Science:
- Materials Science
- Surface Science
- Nanotechnology
Background:
- Graphene's unique properties make it a promising material for advanced applications.
- Controlling surface chemistry and defects is essential for tailoring graphene's functionality.
- Scanning probe lithography (SPL) offers precise patterning capabilities at the nanoscale.
Purpose of the Study:
- To investigate the creation and subsequent reduction of micrometer-sized oxidation patterns in graphene.
- To understand the influence of scanning probe lithography parameters on oxidation.
- To characterize the reduction dynamics of oxidized graphene using focused x-ray beams.
Main Methods:
- Fabrication of oxidation patterns using scanning probe lithography (SPL) on chemical vapor deposition (CVD) grown graphene.
- Characterization using lateral force microscopy (LFM), micro-Raman spectroscopy, and micro-X-ray photoelectron spectroscopy (µXPS).
- Reduction of oxidized graphene via focused x-ray beam irradiation.
Main Results:
- Graphene grain boundary density critically affects maximum oxygen coverage during SPL.
- Bias voltage is the dominant factor in SPL oxidation; a threshold voltage initiates rapid oxygen coverage increase.
- Oxidation duration influences final oxygen coverage.
- A universal set of rate equations describes the reduction dynamics, limited by the C-C → C=C step, irrespective of initial oxidation conditions.
Conclusions:
- SPL parameters, particularly bias voltage and grain boundary density, precisely control graphene oxidation.
- Focused x-ray irradiation provides a controllable method for reducing graphene oxide patterns.
- The identified reduction mechanism provides fundamental insights into graphene surface modification.
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