Nguyen Dang Du, Megra Yonas Tsegaye, Lim TaeGyeong, Suk Ji Won
School of Mechanical Engineering, Sungkyunkwan University, Suwon16419, Gyeonggi-do, Republic of Korea.
Department of Smart Fab. Technology, Sungkyunkwan University, Suwon16419, Gyeonggi-do, Republic of Korea.
ACS Appl Mater Interfaces. 2023 Feb 8;15(5):7627-7634. doi: 10.1021/acsami.2c22310. Epub 2023 Jan 26.
Free-standing graphene-based paper-like materials have garnered significant interest for various applications because of their tunable physical and chemical properties, along with unique multilayered structures. Because of the layered configuration of graphene paper, characterization of the interactions between graphene sheets is critical for understanding its fundamental properties and applications. We investigate the interlayer cohesion energies in graphene papers using the mode I fracture concept with double cantilever beam specimens. Mechanical separation along the middle of the graphene paper thickness enables the evaluation of interlayer bonding strength in the paper. Starting from graphene oxide paper, the chemical reduction using hydroiodic acid tunes the interlayer cohesion energy from 11.30 ± 0.25 to 4.78 ± 0.18 J/m as the reduction time increases. The interlayer cohesion energy is correlated with the oxygen content, interlayer spacing, and electrical conductivity of graphene papers. This work provides a fundamental characterization of the interlayer cohesion energy of graphene paper and establishes the potential for tunability of the interlayer interactions in graphene paper.
独立的石墨烯基纸状材料因其可调节的物理和化学性质以及独特的多层结构，在各种应用中引起了广泛关注。由于石墨烯纸的层状结构，表征石墨烯片层之间的相互作用对于理解其基本性质和应用至关重要。我们使用双悬臂梁试样的I型断裂概念研究了石墨烯纸中的层间内聚能。沿石墨烯纸厚度中间进行机械分离能够评估纸中的层间结合强度。从氧化石墨烯纸开始，随着还原时间的增加，使用氢碘酸进行化学还原可将层间内聚能从11.30±0.25 J/m调节至4.78±0.18 J/m。层间内聚能与石墨烯纸的氧含量、层间距和电导率相关。这项工作提供了石墨烯纸层间内聚能的基本表征，并确立了石墨烯纸中层间相互作用可调节性的潜力。
