Department of Materials, University of Oxford , Parks Road, Oxford, OX1 3PH, United Kingdom.
Department of Materials Science and Engineering, Seoul National University , Seoul, Korea.
ACS Nano. 2015 Dec 22;9(12):11599-607. doi: 10.1021/acsnano.5b05700. Epub 2015 Nov 2.
The atomic structure of subnanometer pores in graphene, of interest due to graphene's potential as a desalination and gas filtration membrane, is demonstrated by atomic resolution aberration corrected transmission electron microscopy. High temperatures of 500 °C and over are used to prevent self-healing of the pores, permitting the successful imaging of open pore geometries consisting of between -4 to -13 atoms, all exhibiting subnanometer diameters. Picometer resolution bond length measurements are used to confirm reconstruction of five-membered ring projections that often decorate the pore perimeter, knowledge which is used to explore the viability of completely self-passivated subnanometer pore structures; bonding configurations where the pore would not require external passivation by, for example, hydrogen to be chemically inert.
通过原子分辨率像差校正透射电子显微镜，展示了石墨烯中超纳滤孔的原子结构，由于石墨烯具有作为脱盐和气体过滤膜的潜力，因此引起了人们的关注。采用 500°C 以上的高温防止孔自修复，从而成功地对由 -4 至-13 个原子组成的开放孔几何形状进行成像，所有这些孔都呈现出亚纳米直径。使用皮米分辨率的键长测量来确认经常修饰孔周长的五重环投影的重构，这些知识被用于探索完全自钝化的亚纳米孔结构的可行性；在这种结构中，孔不需要外部钝化，例如，不需要通过氢来实现化学惰性。
