Figure 5: Step-edge growth rate.
From: In situ observation of step-edge in-plane growth of graphene in a STEM
(a) Comparison between high-speed growth (CVD) and low-speed growth in this study. In this study, between 500 and 700 °C, graphene grows from step-edge. Three different growth rates at different residual hydrocarbon gas pressures are shown. The growth rates at 2.9 × 10−5 Pa are shown by circles and the growth rates at 1.2 × 10−5 Pa are shown by rectangles. When T<500 °C, amorphous carbons appear as contaminations. If T>700 °C, carbon atoms at step-edges are etched and no more graphene growth is found. (b) The growth speed measurements on different selected areas repeated five times at each residual hydrocarbon gas pressure for 1.2 × 10−5 and 2.9 × 10−5 Pa.
