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Figure 1: Monolayer h-BN characterization. (a) Optical image of h-BN on 300 nm SiO2/Si. White dotted line indicates the border between h-BN and SiO2. The inset displays a photograph of h-BN film on a quartz substrate (red dotted area). (b) Optical absorption spectra of a monolayer h-BN, monolayer graphene and a quartz substrate (as a reference). (c) TEM image of the folded edge of a monolayer h-BN.