Zong Hu, Gao Minhui, Ul Hassan Mohsan Aziz, Lin Yibiao, Zhou Ying, Yu Lei, Zhao Su, Li Yifei, Zhang Jiahao
College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China; Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Ultrason Sonochem. 2024 May;105:106863. doi: 10.1016/j.ultsonch.2024.106863. Epub 2024 Mar 28.
Ultrasonic Liquid Phase Exfoliation (LPE) has gathered attention from both scientific and industrial communities for its accessibility and cost-effectiveness in producing graphene. However, this technique has faced challenges such as low yield and long production time. In this study, we developed a cyclic ultrasonication system to exfoliate expanded graphite (EG) by applying static pressure to a flow chamber to address these challenges. Using deionized water (DIW) as solvent and polyvinylpyrrolidone (PVP) as dispersion, we obtained graphene slurries with an average lateral size of 7 μm and averaged number of layers of 3.5 layers, after 40 min of ultrasonication. After centrifugation, the yield of single and bilayer graphene was approximately 16 %. The findings showed that regulating hydrostatic pressure can effectively affect the lateral size and number of layers of few-layer graphene. The proposed method is of good potential for scaled-up production of few-layer graphene.
超声液相剥离法（LPE）因其在生产石墨烯方面的易操作性和成本效益，已引起科学界和工业界的关注。然而，该技术面临着诸如产量低和生产时间长等挑战。在本研究中，我们开发了一种循环超声系统，通过对流动腔室施加静压来剥离膨胀石墨（EG），以应对这些挑战。使用去离子水（DIW）作为溶剂，聚乙烯吡咯烷酮（PVP）作为分散剂，超声处理40分钟后，我们获得了平均横向尺寸为7μm、平均层数为3.5层的石墨烯浆料。离心后，单层和双层石墨烯的产率约为16%。研究结果表明，调节静水压力可以有效地影响少层石墨烯的横向尺寸和层数。所提出的方法在少层石墨烯的规模化生产方面具有良好的潜力。
