Abstract
We report an ultra-high vacuum low-temperature scanning tunneling microscopy (STM) study of the C60 monolayer grown on Cd(0001). Individual C60 molecules adsorbed on Cd(0001) may exhibit a bright or dim contrast in STM images. When deposited at low temperatures close to 100 K, C60 thin films present a curved structure to release strain due to dominant molecule–substrate interactions. Moreover, edge dislocation appears when two different wavy structures encounter each other, which has seldomly been observed in molecular self-assembly. When growth temperature rose, we found two forms of symmetric kagome lattice superstructures, 2 × 2 and 4 × 4, at room temperature (RT) and 310 K, respectively. The results provide new insight into the growth behavior of C60 films.
Highlights
The structures and growth process of C60 monolayer grown on metal surfaces have attracted widespread interest in the past decades due to the unique physical and chemical properties [1,2,3]
When a small amount of C60 molecules was deposited on the Cd(0001) surface at 100
When a small amount of C60 molecules was deposited on the Cd(0001) surface at 100 K, K, they formed individual small clusters
Summary
The structures and growth process of C60 monolayer grown on metal surfaces have attracted widespread interest in the past decades due to the unique physical and chemical properties [1,2,3]. Many results indicate that C60 molecules are easy to nucleate at the terrace edge and may form a close-packed structure under appropriate conditions, regardless of the types of substrate,. Such as the 2 3 × 2 3 R30◦ domain on Au(111) [33,34] and the 4 × 4 superstructure on graphene/Cu(111) [22]. 60 molecules exhibited a bright or(2dim domains, where individual C60 molecules exhibited a bright or dim contrast
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