Journal
ACS NANO
Volume 9, Issue 5, Pages 4734-4742Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b01329
Keywords
nanoscience; self-assembly; carborane; self-assembled monolayer; dipole alignment; scanning tunneling microscopy; two-dimensional; ferroelectric; defect tolerant
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Funding
- AFOSR [FA9550-07-1-0534]
- ARO [W911NF-06-1-0116]
- Northwestern University Presidential Fellowship
- Division Of Mathematical Sciences
- Direct For Mathematical & Physical Scien [0931852] Funding Source: National Science Foundation
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Carboranethiol molecules self-assemble into upright molecular monolayers on Au{111} with aligned dipoles in two dimensions. The positions and offsets of each molecule's geometric apex and local dipole moment are measured and correlated with sub-Angstrom precision. Juxtaposing simultaneously acquired images, we observe monodirectional offsets between the molecular apexes and dipole extrema. We determine dipole orientations using efficient new image analysis techniques and find aligned dipoles to be highly defect tolerant, crossing molecular domain boundaries and substrate step edges. The alignment observed, consistent with Monte Carlo simulations, forms through favorable intermolecular dipole dipole interactions.
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