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Graphene Quantum Dots Based on Mechanical Exfoliation Methods: A Simple and Eco-Friendly Technique.
Zahra Azimi1, Mahsa Alimohammadian1, Beheshteh Sohrabi1
1Surface Chemistry Research Laboratory, Department of Chemistry, Iran University of Science and Technology, P.O. Box 16846-13114, Tehran, Iran.
ACS Omega
|July 29, 2024
Summary
This study introduces three green, cost-effective mechanical methods for preparing graphene quantum dots (GQDs). Combining ultrasonication and ball milling offers a simple, efficient route for GQD production.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Graphene quantum dots (GQDs) are valuable nanomaterials with diverse applications.
- Current GQD preparation methods face challenges in terms of cost, complexity, and environmental impact.
- Developing scalable and sustainable GQD synthesis is crucial for their wider adoption.
Purpose of the Study:
- To investigate three mechanical methods for GQD preparation.
- To evaluate the efficiency, cost-effectiveness, and environmental friendliness of these methods.
- To characterize the structural, chemical, and optical properties of the synthesized GQDs.
Main Methods:
- Liquid-phase exfoliation of graphite using eco-friendly solvents (ethanol and water).
- Mechanical fragmentation via high-power sonication and ball milling.
- Characterization using XRD, FTIR, DLS, FESEM, UV-Vis, and photoluminescence spectroscopy.
Main Results:
- Successful synthesis of GQDs using mechanical exfoliation methods.
- Demonstrated that combined ultrasonication and ball milling is effective and fast.
- Characterized GQDs exhibit properties similar to pristine graphene, with sizes down to 23 nm.
- Photoluminescence peak observed at approximately 610 nm.
Conclusions:
- Mechanical methods, particularly combined ultrasonication and ball milling, provide a simple, cost-effective, and green approach for GQD production.
- The synthesized GQDs retain desirable structural and optical properties.
- These methods offer a promising alternative to existing GQD fabrication techniques.
