Jafarpour Mohammad, Aghdam Araz Sheibani, Gevari Moein Talebian, Koşar Ali, Bayazıt Mustafa Kemal, Ghorbani Morteza
Sabanci University Nanotechnology Research and Application Center 34956 Tuzla Istanbul Turkey.
Faculty of Engineering and Natural Science, Sabanci University 34956 Tuzla Istanbul Turkey.
RSC Adv. 2021 May 18;11(29):17965-17975. doi: 10.1039/d1ra03352b. eCollection 2021 May 13.
Tremendous research efforts have recently focused on the synthesis of graphene from graphitic materials, while environmental issues, scalability, and cost are some of the major challenges to be surmounted. Liquid phase exfoliation (LPE) of graphene is one of the principal methods for this synthesis. Nevertheless, sufficient information about the mechanisms of exfoliation has yet to emerge. Here, a microreactor based on the hydrodynamic cavitation (HC) on a chip concept is introduced to exfoliate graphite in a totally green process which involves only natural graphite flakes and water. HC-treated graphitic materials were characterized by UV-Vis and Raman spectroscopy, DLS (Dynamic Light Scattering), AFM (Atomic Force Microscopy), and SEM (Scanning Electron Microscopy) analyses. The present sustainable reactor system was found to exfoliate thick and large graphite particles to nano-sized sheets (∼1.2 nm) with a lateral size of ∼500 nm to 5 μm.
最近，大量的研究工作集中在从石墨材料合成石墨烯上，而环境问题、可扩展性和成本是需要克服的一些主要挑战。石墨烯的液相剥离（LPE）是这种合成的主要方法之一。然而，关于剥离机制的充分信息尚未出现。在此，引入了一种基于芯片概念上的水力空化（HC）的微反应器，以在一个完全绿色的过程中剥离石墨，该过程仅涉及天然石墨薄片和水。通过紫外可见光谱、拉曼光谱、动态光散射（DLS）、原子力显微镜（AFM）和扫描电子显微镜（SEM）分析对经HC处理的石墨材料进行了表征。发现目前的可持续反应器系统能够将厚的大尺寸石墨颗粒剥离成横向尺寸约为500nm至5μm的纳米尺寸薄片（约1.2nm）。
