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. 2016 Feb 5;6:20708. doi: 10.1038/srep20708

Figure 1. Structural and optical properties of DAS-NG coated culture substrates.

Figure 1

(a) Schematic diagrams of diffusion assisted synthesis-grown nanocrystalline graphene (DAS-NG) preparation on transparent substrates including GL, ITO, and QU for hPSC cultivation. (GBs, Grain boundaries; Ni, Nickel). (b) Optical microscopy images of DAS-NG layers grown at 260 °C on GL, ITO and QU. Graphene layers are indicated with white arrows. (c) Transmittances of DAS/GL (black), DAS/ITO (green) and DAS/QU (red). (d,e) AFM images of (d) 3 dimensional DAS-NG layers on GL with high-density multilayer graphene ridges (red arrow) and (e) 2 dimensional CVD graphene layers on GL. (f) Plot of surface Root-mean-square roughness from AFM images (5 × 5 μm2) of GL, CVD/GL and DAS/GL. (g) Raman spectra of GL (grey), CVD/GL (blue) and DAS/GL (black). (h,i) Images of water drop (40 μl on 1.5 × 1.5 cm2) contact angle on (h) DAS/GL and (i) CVD/GL. (j) Plot of water contact angle measurements on bare GL, CVD/GL and DAS/GL. (k) FT-IR spectra of CVD/GL and DAS/GL. Scale bar, 1 μm (d,e). Data are presented as mean ± s.e.m (n = 3) (f,j).