Figure 1
From: Elementary Process for CVD Graphene on Cu(110): Size-selective Carbon Clusters
Evolution of carbon clusters and formation of grapheme on Cu(110).
(a) STM image (Vtip = 0.25 V, 10 × 10 nm2) of the low coverage carbon clusters on Cu(110), which were formed upon the deposition of CH4 at room temperature and subsequent annealing at 480°C in CH4 at a pressure of 2 × 10−5 mbar for 50 min. (b) STM image (Vtip = 1 V, 10 × 10 nm2) of carbon clusters at higher coverage; A and B indicate the direction of the unit cell vectors. (c) Hexagonally close packed cluster structure formed by further increasing the carbon clusters coverage. (Vtip = 0.2 V, 10 × 10 nm2), C and D indicate the direction of the unit cell vectors. (d) Large scale STM image (Vtip = 0.5 V, 50 × 50 nm2) of carbon clusters and small graphene flakes on Cu(110) by annealing Cu(110) in CH4 at 550°C at a pressure of 2 × 10−5 mbar for 130 min, where the graphene flakes are indicated by “G”. (e) The corresponding high resolution STM image (Vtip = 0.1 V, 15 × 15 nm2) showing the hexagonally close packed carbon clusters in panel 1 (d), where E and F indicate the direction of the unit cell vectors. (f) The atomically resolved STM image (Vtip = 0.03 V, 5 × 5 nm2) showing the 1 × 1 graphene lattice.
