Efficient Macro Preparation of Graphene was Realized

     Graphene is a new two-dimensional honeycomb lattice material composed of single layer sp2 hybrid carbon atoms, which has excellent mechanical, electrical and thermal properties. With its unique properties, graphene has shown great application potential in many fields, and has become a research hotspot in materials science today. 

     Recently, the Sun Youyi scientific research team of North University of China used colloidal chemical volume repulsion, combined with a new method of two-dimensional sheet nanomaterial stripping, to achieve efficient macro preparation of graphene.

     According to reports, the common graphene preparation methods are REDOX method, mechanical stripping method, vapor deposition method, supercritical stripping method, etc., of which REDOX method is the main method of industrial production of graphene at present. The research team adopted the bubble assisted liquid phase mechanical stripping method, using the in-situ generation of bubbles between graphite layers to expand the spacing between graphite layers, replacing the traditional mechanism of strong acid and strong oxidation layer expansion, reducing the physical van der Waals force between graphite sheets, and combined with the colloidal chemical volume repulsion, promoting the graphite to achieve efficient stripping under the liquid phase mechanical shear force. To solve the problems of complicated process, large defects and low yield of graphene prepared by mechanical stripping method.

     This method not only has a simple preparation process, good controllability of graphene structure and batch stability, but also uses strong acids and strong oxidants and generates less wastewater, and has the advantages of green environmental protection, low cost of graphene, fewer defects, and good structural integrity. According to Sun Youyi, the method not only provides the possibility for the preparation of low-cost, high-quality graphene, but also provides a new idea for the preparation of other high-concentration two-dimensional nanosheet materials.