There is a driving necessity for moisture barrier to be flexible as organic-based optoelectronics such as organic photovoltaic devices and organic light emitting diode display devices are opting towards flexible configuration. Most as-reported researches have been focused on increasing the diffusion path of water molecule by adding filler materials in the polymer matrix to improve the water barrier property. However, the surface energy of the barrier film is also an important factor to determine the water barrier property as it controls the degree of water molecule adsorption on the barrier film surface. Herein, surface energy of the graphene oxide (GO) film was varied from 56.7 mN m⁻¹ to 26.3 mN m⁻¹ by combination of removing hydrophilic functional groups by fluorine-silanization and thermal reduction. Altering the surface energy successfully reduced the water permeability value of the bare GO film from 1.86 × 10⁻² g mm m⁻² day⁻¹ to 6.31 × 10⁻³ g mm m⁻² day⁻¹ which corresponds to improvement of about 70%. Furthermore, the surface energy and the water permeability value showed the linear correlation indicating that required water permeability value can be easily manipulated by controlling the surface energy of the GO film.

由于诸如有机光伏器件和有机发光二极管显示器件之类的基于有机的光电器件正在朝着灵活的配置方向发展，因此有必要使水分阻挡层变得柔性。大部分报告的研究都集中在通过在聚合物基体中添加填料来改善水阻隔性能来增加水分子的扩散路径。然而，阻挡膜的表面能也是决定水阻挡性能的重要因素，因为它控制水分子在阻挡膜表面上的吸附程度。此处，氧化石墨烯（GO）膜的表面能从56.7mN m ^-1变化至26.3mN m ^-1通过氟硅烷化和热还原除去亲水性官能团。改变表面能成功地将裸GO膜的透水率值从1.86×10 ^-2 g mm m ^-2天^-1降低到6.31×10 ^-3 g mm m ^-2天^-1，相当于提高了约70 ％。此外，表面能和水渗透率值显示出线性相关性，表明可以通过控制GO膜的表面能容易地操纵所需的水渗透率值。