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Highly dispersible edge-selectively oxidized graphene with improved electrical performance.
Jisoo Park1, Yern Seung Kim1, Sae Jin Sung1
1Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea. crpark@snu.ac.kr.
Nanoscale
|January 17, 2017
Summary
We developed edge-selectively oxidized graphene (LPEOG) for high-concentration inks. This method preserves graphene’s electrical properties, enabling applications in transparent conductive films.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Graphene oxide (GO) production often damages the basal plane, reducing electrical conductivity.
- Developing scalable methods for high-quality graphene production is crucial for advanced applications.
Purpose of the Study:
- To prepare liquid phase exfoliated edge-selectively oxidized graphene (LPEOG) with high concentration and single-layer ratio.
- To demonstrate the superior electrical properties and solution processability of LPEOG compared to traditional graphene oxide.
Main Methods:
- Selective oxidation of graphite edges using a modified Hummers method.
- Liquid phase exfoliation of edge-selectively oxidized graphite (EOG) into LPEOG.
- Characterization using XPS, XRD, Raman, FT-IR, AFM, and TEM.
Main Results:
- Achieved high concentration LPEOG ink (∼14.7 mg ml⁻¹) with 70% single layers.
- Reduced LPEOG exhibited higher conductivity (120,000 S m⁻¹) than reduced GO (68,800 S m⁻¹).
- Transparent conductive films from LPEOG showed lower resistance and higher transmittance.
Conclusions:
- Preserving the π-conjugation of graphene's basal plane is critical for electrical performance.
- The developed method facilitates solution processing of high-performance graphene for diverse applications.
