Fig. 1 | npj 2D Materials and Applications

Fig. 1

From: Dry release transfer of graphene and few-layer h-BN by utilizing thermoplasticity of polypropylene carbonate

Fig. 1

Schematics, calculated results, and optical micrographs of a–e graphene (Gr)/ poly(propylene) carbonate (PPC)/SiO2/Si, f–j Gr/SiO2/Si, k–o h-BN/PPC/SiO2/Si, and p–r h-BN/SiO2/Si structures. a, f, k, p Schematics of the device structure with refractive indexes n1, n2, n3, n4, and n5 for Gr, PPC, SiO2, Si, and h-BN, respectively. The thicknesses d1, d2, d3, d4, and d5 are also depicted for Gr, PPC, SiO2, Si, h-BN, respectively. b, g, l, q Calculated optical contrast as a function of wavelength and thickness for b, l PPC and g, q SiO2. c, h, m, r Representative calculated optical contrast for single-layer and bi-layer c, h Gr and m, r h-BN. d, e, i, j, n, o Optical micrographs of d, i single-layer Gr, e, j bi-layer Gr, and n, o three-layer and four-layer h-BN. All the scale bars are 10 μm

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