Fig. 3: High quality single-layer suspended graphene.
a Raman spectra of suspended graphene transferred by CD (Sus-Gr. by CD in red) or by polymethyl methacrylate (PMMA) (Sus-Gr. by PMMA in purple), and supported graphene on Si wafer transferred by CD (Gr./Si by CD in orange) or by PMMA (Gr./Si by PMMA in blue). b Statistical result of the intensity ratio of Raman 2D to G peaks (I2D/IG). c Statistical result of the peak width at half height of 2D peaks (FWHM2D). The solid lines in (b) and (c) are the fitted distribution curves. d The relationship of 2D peak position and G peak position from Raman spectra. e Raman spectra of single-layer suspended graphene film excited at different power lasers. The measured suspended single-layer graphene is on TEM SiN holey grid with 10 µm suspended diameter. f The calculated thermal conductivity as a function of temperature (purple points) with a fit (the dashed line).
