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 language | English (US) |
|---|---|
| Pages (from-to) | 2098-2104 |
| Number of pages | 7 |
| Journal | Nano Letters |
| Volume | 18 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 14 2018 |
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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 journal › Article
}
TY - JOUR
T1 - Strain Modulation of Graphene by Nanoscale Substrate Curvatures
T2 - A Molecular View
AU - Zhang, Yingjie
AU - Heiranian, Mohammad
AU - Janicek, Blanka
AU - Budrikis, Zoe
AU - Zapperi, Stefano
AU - Huang, Pinshane
AU - Johnson, Harley T
AU - Aluru, Narayana R
AU - Lyding, Joseph W
AU - Mason, Nadya
PY - 2018/3/14
Y1 - 2018/3/14
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=85043995823&partnerID=8YFLogxK
U2 - 10.1021/acs.nanolett.8b00273
DO - 10.1021/acs.nanolett.8b00273
M3 - Article
VL - 18
SP - 2098
EP - 2104
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 3
ER -