Tanaka Shigeru, Inao Daisuke, Hasegawa Kouki, Hokamoto Kazuyuki, Chen Pengwan, Gao Xin
Institute of Industrial Nanomaterials (IINa), Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.
Technical Division, Faculty of Engineering, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.
Nanomaterials (Basel). 2021 May 6;11(5):1223. doi: 10.3390/nano11051223.
This study aims to clarify the mechanism of exfoliation of graphene through electrical pulsed wire discharge (PWD) of a graphite strip, made by the compression of inexpensive expanded graphite in water. The explosion of the graphite strip was visualized using a high-speed video camera. During the energized heating of the sample, explosions, accompanied by shock waves due to expansion of gas inside the sample, occurred at various locations of the sample, and the sample started to expand rapidly. The exfoliated graphene was observed as a region with low light transmittance. The PWD phenomenon of graphite strips, a type of porous material, is reasonably explained by the change in electrical resistivity of the sample during discharge and the light emission due to energy transition of the excited gas.
本研究旨在阐明通过对在水中压缩廉价膨胀石墨制成的石墨条进行电脉冲线放电（PWD）来实现石墨烯剥离的机制。使用高速摄像机对石墨条的爆炸进行了可视化观察。在对样品进行通电加热期间，样品内部由于气体膨胀产生冲击波，伴随着爆炸在样品的不同位置发生，并且样品开始迅速膨胀。观察到剥离的石墨烯为低透光率区域。作为一种多孔材料的石墨条的PWD现象，可以通过放电过程中样品电阻率的变化以及激发气体能量跃迁导致的发光来合理解释。
