Fig. 1: Synthesis of large-area graphene on low-cost Cu foil.
From: Scalable synthesis of CO2-selective porous single-layer graphene membranes
a, A home-built CVD reactor for the synthesis of large-area graphene. b, Three-dimensional cross-section model of the reaction chamber equipped with radiation shields, an alumina tube and a 110-cm-long sample plate inside the heating zone. c, Two 11 × 26 cm2 single-layer graphene coupons synthesized in a single batch in the CVD reactor. d, The side view of the CVD reactor hosting a 16-cm-diameter alumina tube. e–h, SEM images of graphene surface grown on as-received (e) and acid-treated (f) Cu foil and the corresponding contamination particle density (for as-received (g) and acid-treated (h) Cu foil). The error bar refers to the standard deviation in particle density across three different spots for different particle sizes. The center of the error bar represents the average particle density calculated from the SEM analysis. i–n, Optical microscope images of as-received (i and j) and acid-treated (k and l) Cu foil before (i and k) and after (j and l) graphene growth. Profilometry mapping images of as-received (m) and acid-treated (n) Cu foil after graphene growth. o, The Raman spectrum of graphene transferred on a Si/SiO2 wafer. p, An AC-HRTEM image of single-layer graphene synthesized in this work. q,r, Raman mappings of D and G peak intensity ratio (ID/IG, q) and 2D and G peak intensity ratio (I2D/IG, r) across an area of 48 × 80 µm2. RMS, root mean square.
