Journal
NANO LETTERS
Volume 13, Issue 7, Pages 3199-3204Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl401265f
Keywords
Molecular self-assembly; graphene; hexagonal boron nitride (h-BN); cobalt phthalocyanine (CoPc); scanning tunneling microscopy (STM); scanning tunneling spectroscopy (STS)
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Funding
- European Research Council [ERC-2011-StG 278698]
- Finnish Academy of Science and Letters
- Academy of Finland
- Grants-in-Aid for Scientific Research [21106001] Funding Source: KAKEN
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One of the suggested ways of controlling the electronic properties of graphene is to establish a periodic potential modulation on it, which could be achieved by self-assembly of ordered molecular lattices. We have studied the self-assembly of cobalt phthalocyanines (CoPc) on chemical vapor deposition (CVD) grown graphene transferred onto silicondioxide (SiO2) and hexagonal boron nitride (h-BN) substrates. Our scanning tunneling microscopy (STM) experiments show that, on both substrates, CoPc forms a square lattice. However, on SiO2, the domain size is limited by the corrugation of graphene, whereas on h-BN, single domain extends over entire terraces of the underlying h-BN. Additionally, scanning tunneling spectroscopy (STS) measurements suggest that CoPc molecules are doped by the substrate and that the level of doping varies from molecule to molecule. This variation is larger on graphene on SiO2 than on h-BN. These results suggest that graphene on h-BN is an ideal substrate for the study of molecular self-assembly toward controlling the electronic properties of graphene by engineered potential landscapes.
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