Ogawa Shuichi, Yamaguchi Hisato, Holby Edward F, Yamada Takatoshi, Yoshigoe Akitaka, Takakuwa Yuji
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States.
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan.
J Phys Chem Lett. 2020 Nov 5;11(21):9159-9164. doi: 10.1021/acs.jpclett.0c02112. Epub 2020 Oct 26.
Graphene gas-barrier performance holds great interest from both scientific and technological perspectives. Using in situ synchrotron X-ray photoelectron spectroscopy, we demonstrate that chemical vapor-deposited monolayer graphene loses its gas-barrier performance almost completely when oxygen molecules are imparted with sub-electronvolt kinetic energy but retains its gas-barrier performance when the molecules are not energized. The permeation process is nondestructive. Molecular dynamics-based simulation suggests kinetic energy-mediated chemical reactions catalyzed by common graphene defects as a responsible mechanism.
从科学和技术角度来看，石墨烯的气体阻隔性能都备受关注。通过原位同步加速器X射线光电子能谱，我们证明，当氧分子具有亚电子伏特动能时，化学气相沉积的单层石墨烯几乎完全失去其气体阻隔性能，但当分子未被激发时，它仍保留其气体阻隔性能。渗透过程是非破坏性的。基于分子动力学的模拟表明，由常见的石墨烯缺陷催化的动能介导化学反应是一种可能的机制。
