Materials Science Factory, Dept. Surfaces, Coatings and Molecular Astrophysics, Institute of Material Science of Madrid (ICMM-CSIC), C/Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain.
Nanoscale. 2019 Sep 19;11(36):16767-16772. doi: 10.1039/c9nr03970h.
The ageing of graphene is an important issue that limits its technological applications. Capping layers are a good option for circumventing this problem. In this work, we propose the use of ultra-thin NaCl films as easily-removable protective layers. We have carried out a detailed characterization of the NaCl/graphene interface on metal substrates, namely Cu(111) and Ir(111), by means of complementary microscopy, electron diffraction and spectroscopic techniques. Interestingly, we show that NaCl neither interacts in a chemical way with graphene nor intercalates through it. We demonstrate that the NaCl film is stable under ambient conditions, protecting the graphene surface from oxidation. In addition, after removing the protective layer, graphene remains intact.
石墨烯的老化是限制其技术应用的一个重要问题。盖帽层是解决这个问题的一个很好的选择。在这项工作中，我们提出使用超薄 NaCl 薄膜作为易于去除的保护层。我们通过互补的显微镜、电子衍射和光谱技术，对金属衬底（即 Cu(111)和 Ir(111)）上的 NaCl/石墨烯界面进行了详细的表征。有趣的是，我们表明 NaCl 既没有与石墨烯发生化学相互作用，也没有通过它进行插层。我们证明了 NaCl 薄膜在环境条件下是稳定的，保护石墨烯表面免受氧化。此外，去除保护层后，石墨烯仍然完好无损。
