Mechanical failures of Two-Dimensional materials on polymer substrates

Kwanbyung Chae, Van Tu Nguyen, Sangryun Lee, Thi Quynh Phung, Yumin Sim, Maeng Je Seong, Sangwoon Lee, Yeong Hwan Ahn, Soonil Lee, Seunghwa Ryu, Ji Yong Park

Research output: Contribution to journalArticlepeer-review


The mechanical stability and failures of two-dimensional (2D) materials on the compliant polymer substrates under biaxial strain are investigated. As the polymer substrate swells, the fracture of the system is initiated with the crack-formation in 2D materials (graphene and MoS2 flakes), which propagates deep into the substrates. According to the fracture theory, the generation of deep cracks in such a system (thin hard material on a compliant substrate) is expected to be a universal behavior due to a large mismatch in the elastic moduli between the film and the substrate. The properties of crack formation in systems with varying crystallinity and size of 2D materials are also investigated. The present results provide important insights into what to consider for mechanical stability in designing flexible devices based on 2D materials.

Original languageEnglish
Article number154736
JournalApplied Surface Science
StatePublished - 15 Dec 2022


  • Crack
  • Fracture
  • Graphene
  • Molybdenum disulfide
  • Polymer
  • Strain


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