Department of Physics, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany.
J Colloid Interface Sci. 2013 Oct 1;407:500-4. doi: 10.1016/j.jcis.2013.06.034. Epub 2013 Jun 27.
Molecular adlayers on mica have been visualized previously by coating the sample with graphene and imaging it by scanning force microscopy. While it had been argued that this shows that ambient water on mica exhibits ice-like structures, recent apparently similar experiments indicate different behaviors. Here, we demonstrate that adhesive tapes, which are often used to mechanically exfoliate graphenes onto solid substrates, can lead to water-containing adlayers, which differ substantially from pure water layers. We exfoliated graphenes with the aid of different adhesive tapes and demonstrate that the results depend on the particular tape. Our results imply that structure and properties of confined water adlayers can be controlled by minor amounts of additives.
此前，通过在云母样品上涂覆石墨烯并用扫描力显微镜对其进行成像，已经观察到分子吸附层在云母上的存在。虽然有人认为这表明云母上的环境水表现出类似冰的结构，但最近显然类似的实验表明了不同的行为。在这里，我们证明了通常用于将石墨烯机械剥落到固体基底上的胶带可以导致含有水的吸附层，这些吸附层与纯水层有很大的不同。我们使用不同的胶带辅助剥落石墨烯，并证明结果取决于特定的胶带。我们的结果表明，受限水吸附层的结构和性质可以通过少量添加剂来控制。
