Low-temperature growth of large-scale, single-crystalline graphene on Ir(111)

Guo Hui¹, Chen Hui¹, Que Yande¹, Zheng Qi¹, Zhang Yu-Yang^{1, 2}, Bao Li-Hong¹, Huang Li¹, Wang Ye-Liang¹, Du Shi-Xuan^{1, 2, †}, Gao Hong-Jun^{1, 2}

Continuous LEED patterns revealing a single-crystalline graphene on Ir. (a) A photo of the sample with a size of 4 mm square. Red circles represent positions where four continuous LEED patterns were taken. (b) One of the LEED patterns (68 eV) taken at positions in (a). (c) Corresponding LEED intensity profiles along the arc (from 0° to 60°). Four red profiles are obtained from the individual LEED patterns taken at the four positions 1–4, respectively. The bottom black profile is obtained from the LEED pattern of the polycrystalline graphene for comparison.