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<p>The excellent impermeability makes graphene film an ideal candidate for thin film encapsulation technology. However, current chemical vapor deposition (CVD) graphene-based barrier films can not provide sufficient moisture barrier performance, suggesting a lack of understanding in mechanism that dominates water diffusion in/through graphene stacks. Herein, we fabricate large-area graphene barrier films with a record-low water vapor transmission rate (WVTR) of 5 × 10<sup>−5 </sup>g/(m<sup>2</sup>·day), two orders of magnitude lower than previous works, in which two stacked Janus graphene films are intercalated by toluidine blue O (TBO) sub-monolayer: one side of graphene is decorated with fluorine- and oxygen-containing groups to allow crack-free transfer, while the other side is functionalized&#xa0;with hydroxyl groups to trap water. The intercalated TBO further blocks water transport due to a strong water-TBO interaction. Our work opens a route for surface/interface engineering of CVD graphene and promises its exciting future in the applications for advanced packaging.</p>

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Principles for fabricating moisture barrier films via stacked Janus graphene layers

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年4月13日

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  • Chaofan Zhou,
  • Hongjie Gao,
  • Saiyu Bu,
  • Haotian Wu,
  • Fan Liang,
  • Fangfang Li,
  • Zhaoning Hu,
  • Yixuan Zhao,
  • Bingbing Guo,
  • Zelong Li,
  • Li Yin,
  • Xiaokai Hu,
  • Qin Xie,
  • Yang Su,
  • Zhongfan Liu,
  • Li Lin

摘要

The excellent impermeability makes graphene film an ideal candidate for thin film encapsulation technology. However, current chemical vapor deposition (CVD) graphene-based barrier films can not provide sufficient moisture barrier performance, suggesting a lack of understanding in mechanism that dominates water diffusion in/through graphene stacks. Herein, we fabricate large-area graphene barrier films with a record-low water vapor transmission rate (WVTR) of 5 × 10−5 g/(m2·day), two orders of magnitude lower than previous works, in which two stacked Janus graphene films are intercalated by toluidine blue O (TBO) sub-monolayer: one side of graphene is decorated with fluorine- and oxygen-containing groups to allow crack-free transfer, while the other side is functionalized with hydroxyl groups to trap water. The intercalated TBO further blocks water transport due to a strong water-TBO interaction. Our work opens a route for surface/interface engineering of CVD graphene and promises its exciting future in the applications for advanced packaging.