Abstract

Spatially nonuniform strain is important for engineering the pseudomagnetic field and band structure of graphene. Despite the wide interest in strain engineering, there is still a lack of control on device-compatible strain patterns due to the limited understanding of the structure-strain relationship. Here, we study the effect of substrate corrugation and curvature on the strain profiles of graphene via combined experimental and theoretical studies of a model system: graphene on closely packed SiO 2 nanospheres with different diameters (20-200 nm). Experimentally, via quantitative Raman analysis, we observe partial adhesion and wrinkle features and find that smaller nanospheres induce larger tensile strain in graphene; theoretically, molecular dynamics simulations confirm the same microscopic structure and size dependence of strain and reveal that a larger strain is caused by a stronger, inhomogeneous interaction force between smaller nanospheres and graphene. This molecular-level understanding of the strain mechanism is important for strain engineering of graphene and other two-dimensional materials.

Original languageEnglish (US)
Pages (from-to)2098-2104
Number of pages7
JournalNano Letters
Volume18
Issue number3
DOIs
StatePublished - Mar 14 2018

Fingerprint

Graphite
Graphene
graphene
curvature
Modulation
modulation
Substrates
Nanospheres
engineering
adhesion
Tensile strain
molecular dynamics
Band structure
Molecular dynamics
Adhesion
profiles
simulation
Computer simulation

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Strain Modulation of Graphene by Nanoscale Substrate Curvatures : A Molecular View. / Zhang, Yingjie; Heiranian, Mohammad; Janicek, Blanka; Budrikis, Zoe; Zapperi, Stefano; Huang, Pinshane; Johnson, Harley T; Aluru, Narayana R; Lyding, Joseph W; Mason, Nadya.

In: Nano Letters, Vol. 18, No. 3, 14.03.2018, p. 2098-2104.

Research output: Contribution to journalArticle

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AU - Budrikis, Zoe

AU - Zapperi, Stefano

AU - Huang, Pinshane

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