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Strain-Relief Patterns and Kagome Lattice in Self-Assembled C<sub>60</sub> Thin Films Grown on Cd(0001)
oleh: Zilong Wang, Minlong Tao, Daxiao Yang, Zuo Li, Mingxia Shi, Kai Sun, Jiyong Yang, Junzhong Wang
Format: | Article |
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Diterbitkan: | MDPI AG 2021-06-01 |
Deskripsi
We report an ultra-high vacuum low-temperature scanning tunneling microscopy (STM) study of the C<sub>60</sub> monolayer grown on Cd(0001). Individual C<sub>60</sub> molecules adsorbed on Cd(0001) may exhibit a bright or dim contrast in STM images. When deposited at low temperatures close to 100 K, C<sub>60</sub> 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 C<sub>60</sub> films.