Fig. 4
From: Preparation of Ultra-Smooth Cu Surface for High-Quality Graphene Synthesis
OM images of transferred graphene films grown on a AR-Cu, b EP-Cu, and c EA-Cu. Scale bars, 10 μm. (AFM images and amplitude spectrum corresponding to each transferred graphene, inset upper right corner. Scale bars, 1 μm.) d Histogram statistical graph of graphene adlayer density grown on AR-Cu, EP-Cu, and EA-Cu. The adlayer density is calculated by randomly taking a region with an area of 120 × 90 μm2 and then counting the adlayers within the region. e Raman spectra of transferred graphene grown on AR-Cu, EP-Cu, and EA-Cu, respectively. f Histogram statistical graph of ID/IG in Raman spectra of graphene grown on AR-Cu, EP-Cu, and EA-Cu