Dreier L B, Liu Z, Narita A, van Zadel M-J, Müllen K, Tielrooij K-J, Backus E H G, Bonn M
Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Graduate School Materials Science in Mainz, Staudingerweg 9, 55128 Mainz, Germany.
J Phys Chem C Nanomater Interfaces. 2019 Oct 3;123(39):24031-24038. doi: 10.1021/acs.jpcc.9b05844. Epub 2019 Sep 9.
Knowledge of the structure of interfacial water molecules at electrified solid materials is the first step toward a better understanding of important processes at such surfaces, in, e.g., electrochemistry, atmospheric chemistry, and membrane biophysics. As graphene is an interesting material with multiple potential applications such as in transistors or sensors, we specifically investigate the graphene-water interface. We use sum-frequency generation spectroscopy to investigate the pH- and potential-dependence of the interfacial water structure in contact with a chemical vapor deposited (CVD) grown graphene surface. Our results show that the SFG signal from the interfacial water molecules at the graphene layer is dominated by the underlying substrate and that there are water molecules between the graphene and the (hydrophilic) supporting substrate.
了解带电固体材料表面界面水分子的结构是更好地理解此类表面重要过程的第一步，例如在电化学、大气化学和膜生物物理学中的过程。由于石墨烯是一种具有多种潜在应用的有趣材料，如在晶体管或传感器中，我们专门研究了石墨烯-水界面。我们使用和频振动光谱来研究与化学气相沉积（CVD）生长的石墨烯表面接触的界面水结构对pH值和电位的依赖性。我们的结果表明，石墨烯层处界面水分子的和频信号主要由下层衬底主导，并且在石墨烯和（亲水性）支撑衬底之间存在水分子。
