Affiliation:
1. Vietnam Academy of Science and Technology
Abstract
Abstract
This paper utilizes an efficient and environmentally friendly method for synthesizing graphene from graphite, namely liquid-phase exfoliation. High-power density ultrasonic vibrators were used to separate graphite layers into graphene in a liquid medium. During layer separation, ultrasonic waves provided mechanical energy to break the Van der Walls bonds and separate graphite layers into graphene. In our study, graphene was synthesized by ultrasonicating graphite in Tween 80 for 1 to 5 hours, followed by magnetic stirring and surfactant removal. The FESEM and Raman measurements demonstrated that high-frequency ultrasound waves were effective at breaking the Van der Waals bonding force between adjacent graphite layers. Average flake sizes (lateral) were reduced with increasing ultrasonication time, reaching a minimum value of 317 nm with 5 hours of ultrasonic treatment. These results show that liquid-phase exfoliation is a cost-effective method to obtain low-defect few-layer graphene.
Publisher
Research Square Platform LLC
Reference26 articles.
1. Electric field effect in atomically thin carbon films;Novoselov KS;Science,2004
2. Solid-state 13C NMR of carbon nanostructures (milled graphite, graphene, carbon nanotubes, nanodiamonds, fullerenes) in 2000–2019: A mini-review;Mazur AS;Fullerenes, Nanotubes and Carbon Nanostructures,2019
3. Graphene: Fabrication methods and thermophysical properties;Eletskii AV;Physics-Uspekhi,2011
4. Synthesis of graphene;Bhuyan Md S;International Nano Letters,2016
5. Synthesis and fabrication of graphene and graphene oxide: A Review;Adetayo A;Open Journal of Composite Materials,2019