East China: Shanghai Carbon Source Huigu New Materials Technology Co., Ltd., Jinan Moxi New Materials, Jining Park Yungsu Nano Technology Co., Ltd., Changzhou Sixth Element, Suzhou Hengqiu Graphene Technology Co., Ltd., Nanjing Xianfeng Nano Materials Technology Co., Ltd., Suzhou Hengqiu Graphene Technology Co., Ltd., Nanjing Tao Xin Materials Technology Co., Ltd., Xiamen Kaina Graphene Technology Co., Ltd., Changzhou 2D Carbon Technology Co., Ltd., Ningbo Moxi Technology Co., Ltd.
North China: Tianjin Pulan Nano Technology Co., Ltd., Beijing Ji 'anxin Technology Co., Ltd., Grefini (Beijing) Technology Co., Ltd., Beijing Qingda International Optical Technology Development Co., Ltd., Inner Mongolia Shengrui New Energy Co., Ltd., Tianjin Pulan Nano Technology Co., Ltd.
Central China: Changsha Ross Technology Co., Ltd.
Northwest China: Xi Anwar Graphene Co., Ltd.
Southwest China? Deyang Alkene Carbon Technology Co., Ltd. of Chinese Academy of Sciences and Chengdu Organic Chemistry Co., Ltd.
There are three methods to produce graphene: generally speaking, there is 1. Vapor deposition II. Redox method 3. Intercalation method.
1. Meteorological deposition method is mainly carbon-containing gas (methane, vaguely). Under certain temperature and pressure conditions, carbon atoms attach to the growth base, forming a single-layer carbon structure substance and growing gradually. Advantages: The obtained graphene has a good structure and the size is not limited by raw materials. Disadvantages: complex preparation process and low production efficiency.
2. Redox method is to oxidize graphite layer by layer with oxidant, and peel off the oxide layer with ultrasonic wave. And then reducing the graphite oxide layer with a reducing agent to obtain graphene. Advantages: low cost and high production efficiency. Disadvantages: The size of graphene is determined by raw materials, and the oxidant and reductant used may pollute the environment.
3. Intercalation method is to fill intercalation substances into the gaps between graphite layers, so as to overcome the van der Waals force between the layers and disperse the layers, thus obtaining graphene. This method is still in the development stage.