Hummers法合成石墨烯的关键工艺及反应机理

Key Processes and Mechanism for Preparing Graphene by Hummers Method

采用经典的Hummers法合成石墨烯,对合成温度、反应时间、氧化剂的添加量、还原剂的加入量等实验条件进行改变,研究了影响合成的关键工艺。结果表明:控制高温反应的温度在90～100℃范围内是提高产率最为关键的因素。控制低温反应的温度接近0℃,中温反应的温度为30～45℃,保证反应时间分别大于30min和60min,并添加过量的氧化剂,可以使产率得到一定的提高。

Graphene was prepared by the classic Hummers method. By changing reaction temperature, reaction time, oxidant addition and reductant addition, the key processes that influenced the prepara- tion were studied. The result shows that keeping the high temperature stage in the range of 90-100℃ is the most important factor to ensure high yield. In order to improve yield, the low and intermediate temperature stages should be kept close to 0℃ and 30-45℃ and the reaction time should be longer than 30min and 60min respectively. Moreover, excess oxidants is also an important factor.