Abstract Exfoliation synthesis of graphene requires a lesser amount of wasteful chemicals and due to the hydrophobic nature, a naturally separated graphene layer is obtained with the method. In this study, three combinations of simple mechanical processes were utilized for the exfoliation synthesis of graphene sheets. The synthesized graphene sheets were characterized with TEM, SAED, SEM and EDS techniques. Based on the characterization results, the method that produced the best quality of graphene sheets was selected for further quality optimization study with alkali halide salts. Three different salts were chosen for the investigation. In the literature, there were several articles reporting improvement in flake size and the quality of the synthesized graphene sheets on account of using NaCl, sulfur, etc. Intercalation of salt particles between the layers, acting as tiny wedges to facilitate fluent exfoliation, was reported as the possible mechanism. Contrary to the popular notion of the quality improvement of the synthesized graphene sheets with such intercalation attempts, our characterization results conclusively demonstrate that the quality does not improve.

中文翻译：

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石墨烯的剥离合成及碱金属卤化物盐的优化

摘要 石墨烯的剥离合成需要较少的浪费化学品，并且由于其疏水性，该方法获得了自然分离的石墨烯层。在这项研究中，三种简单机械过程的组合被用于石墨烯片的剥离合成。合成的石墨烯片用 TEM、SAED、SEM 和 EDS 技术表征。根据表征结果，选择了生产石墨烯片质量最好的方法，用于碱金属卤化物盐的进一步质量优化研究。选择了三种不同的盐进行研究。在文献中，有几篇文章报道了由于使用 NaCl、硫等，薄片尺寸和合成石墨烯片质量的改进。据报道，盐颗粒在层之间插入，充当微小的楔子以促进流畅的剥落，被报告为可能的机制。与通过这种插层尝试提高合成石墨烯片质量的流行观念相反，我们的表征结果最终证明质量没有提高。