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Influence of Oxidation Time on Defect Density and Crystallinity in Graphene Oxide Synthesized via Modified Hummer's
Shivang Saxena1, Akshay Kumar2, Naveen Yadav1
1Department of Materials Convergence and System Engineering, Changwon National University, Changwon, Gyeongnam 51140, Republic of Korea.
Controlling oxidation time during graphene oxide synthesis is key. This study reveals how reaction duration impacts graphene oxide structure and properties, enabling better control for applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Graphene oxide (GO) synthesis involves graphite oxidation, a critical step influencing final material properties.
- The precise mechanism of structural and chemical evolution during graphite oxidation remains unclear.
Purpose of the Study:
- To investigate the effect of controlled oxidation time on graphene oxide synthesis.
- To elucidate the time-dependent mechanism of structural and chemical changes during GO formation.
Main Methods:
- Modified Hummer's method for graphene oxide synthesis with varying oxidation durations (6, 12, 24 hours).
- Characterization using X-ray Diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS), and Raman Spectroscopy.
Main Results:
- XRD indicated time-dependent crystallite size variations with stable interlayer spacing.
- FTIR and XPS showed stable overall oxygen content but altered functional group distribution over time.
- Raman spectroscopy revealed a progressive increase in defect density with extended oxidation.
Conclusions:
- A time-dependent oxidation mechanism for graphene oxide was proposed.
- Controlled oxidation time offers a method to systematically tune GO properties.
- Findings provide insights for optimizing GO synthesis for practical applications.
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