Supplementary data

Domain-Boundary Independency of Raman Spectra for Strained

Graphene at Strong Interfaces

Yunlu Wang, Yang Wang‡, Chen Xu, Xuewei Zhang, Le Mei, Miao Wang,

Yang Xia, Pei Zhao, Hongtao Wang

Figure S1. Home-made tensile testing machine modified from a micrometer-equipped multi-axis

stage (MAX313D, ThorLabs, Inc.).

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Figure S2. A graphene single crystal grown on the Cu foil and visualized by mild oxidization

and optical microscopy. Scale bar: 50 μm.

Figure S3. Raman spectra of graphene/formvar/PDMS and graphene/SiO2 demonstrates an ideal

Raman platform for detecting both the G and 2D peaks from graphene.

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Figure S4. Domain size characterization of polycrystalline graphene before the domain

coalescence. The average size of the domains is ~5 μm. Scale bar: 20 μm.

Figure S5. The G band peak of p-SGR at 1.05%, fitted by one or two Lorentzian curves.

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