Many far-reaching applications of graphene require a deep understanding of the interactions between graphene and other surfaces, including the wetting behaviour of graphene. However, its two-dimensional nature does not allow qualifying graphene as simply hydrophobic or hydrophilic, but instead gives rise to a diversity of interfacial phenomena governing the apparent wettability of graphene. As a result, wide disparities in the wetting properties of graphene have been widely reported. In this review we analyse the wettability of graphene with a special focus on the experimental conditions and on discriminating the causes of the reported inconsistencies. The elimination of the environmental factors causing misleading data is a major challenge. Importantly, progresses made in graphene research yielded new experimental insights and tools enabling the minimization of unwanted effects and, ultimately, the achievement of reliable contact angle measurements. Besides the macroscopic wettability studied using contact angle measurements under ambient conditions or by theoretical modelling, we also analysed correlations with the wettability of graphene at the molecular level in supremely pure environment of ultra-high vacuum.

石墨烯的许多广泛应用都需要对石墨烯与其他表面之间的相互作用（包括石墨烯的润湿行为）有深入的了解。然而，其二维性质不允许石墨烯简单地为疏水性或亲水性，而是引起控制石墨烯的表观润湿性的多种界面现象。结果，已经广泛报道了石墨烯的润湿性能的巨大差异。在这篇综述中，我们分析了石墨烯的可湿性，特别侧重于实验条件和辨别了所报道不一致的原因。消除造成误导性数据的环境因素是一项重大挑战。重要的，石墨烯研究的进展产生了新的实验见解和工具，可最大程度地减少不良影响，并最终实现可靠的接触角测量。除了在环境条件下使用接触角测量或通过理论建模研究的宏观润湿性外，我们还分析了在超高真空的超纯环境中与石墨烯在分子水平上的润湿性的相关性。