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Liquid Phase Graphene Exfoliation with a Vibration-Based Acoustofluidic Effector.
Yu Liu1, Zhaorui Wen1, Ziyu Huang1
1Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau 999078, China.
Micromachines
|September 28, 2023
Summary
This study presents a novel microfluidic sonication device for efficient graphene production via liquid phase exfoliation (LPE). The cost-effective device reduces power consumption, enabling scalable and economical graphene manufacturing.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Liquid phase exfoliation (LPE) is a key method for industrial graphene production.
- Conventional sonication in LPE suffers from high energy consumption and low efficiency.
- This limits the industrial applicability of LPE for graphene synthesis.
Purpose of the Study:
- To introduce a novel, cost-effective microfluidic sonication device for graphene production.
- To significantly reduce power consumption and enhance efficiency in the LPE process.
- To demonstrate the device's capability for scalable and economical graphene manufacturing.
Main Methods:
- A microfluidic sonication device was designed by coupling a capillary with a buzzer.
- Acoustic streaming and cavitation were generated by applying an electric signal to the capillary.
- Graphene exfoliation was performed in a N,N-Dimethylformamide (DMF) + NaOH system.
- Scanning Electron Microscopy (SEM) and Raman spectroscopy were used for characterization.
Main Results:
- The device generated robust shear forces, facilitating graphene exfoliation.
- Successful exfoliation of graphene sheets (100 nm, <10 nm thickness) from graphite was achieved.
- Increased I2D/IG ratios confirmed the formation of thinner graphene sheets.
- The device demonstrated versatility for both small-batch and large-scale production.
Conclusions:
- The developed microfluidic sonication device offers a cost-effective and energy-efficient solution for graphene production.
- This technology is scalable for industrial manufacturing and optimizes raw 2D material utilization.
- It presents a significant advancement for experimental and industrial graphene synthesis.
