Strain Modulation of Graphene by Nanoscale Substrate Curvatures: A Molecular View

Nano Letters
Yingjie ZhangNadya Mason

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 SiO2nanospheres 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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Citations

Aug 17, 2019·Small·Xiangbiao LiaoXi Chen
Sep 14, 2019·Nanotechnology·Alexandre F FonsecaSusan B Sinnott
Jan 17, 2019·Advanced Materials·Zhaohe DaiZhong Zhang
Oct 16, 2018·Frontiers in Chemistry·Ning WangChing-Ping Wong
Apr 11, 2020·Micromachines·Fayong LiuHiroshi Mizuta
May 20, 2020·Journal of Microscopy·Rossana Dell'AnnaGiancarlo Pepponi
Mar 27, 2021·ACS Nano·Feng HeYaguo Wang
May 18, 2021·Physical Chemistry Chemical Physics : PCCP·Zihui ZhaoChangguo Wang
Jan 1, 2020·Nano Letters·Neeraj DwivediCharanjit S Bhatia
Dec 15, 2020·ACS Applied Materials & Interfaces·Tom VincentOlga Kazakova
May 24, 2019·Nano Letters·Lujun WangChristian Schönenberger
Jul 20, 2018·ACS Applied Materials & Interfaces·Seunghun KangYunseok Kim
Oct 2, 2021·ACS Applied Materials & Interfaces·Cinzia Di GiorgioFabrizio Bobba

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