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Title: Molecular Self-Assembly in a Poorly Screened Environment: F4TCNQ on Graphene/BN
Authors: Tsai, H.-Z
Omrani, A.A
Coh, S
Oh, H
Wickenburg, S
Son, Y.-W
Wong, D
Riss, A
Jung, H.S
Nguyen, G.D
Rodgers, G.F
Aikawa, A.S
Taniguchi, T
Watanabe, K
Zettl, A
Louie, S.G
Lu, J 
Cohen, M.L
Crommie, M.F
Keywords: Atomic force microscopy
Binding energy
Boron nitride
Density functional theory
Scanning tunneling microscopy
Formation mechanism
Hexagonal boron nitride
Intermolecular interactions
Local work function
Molecular self assembly
Noncontact atomic force microscopy
Self-assembly behaviors
Self assembly
Issue Date: 2015
Publisher: American Chemical Society
Citation: Tsai, H.-Z, Omrani, A.A, Coh, S, Oh, H, Wickenburg, S, Son, Y.-W, Wong, D, Riss, A, Jung, H.S, Nguyen, G.D, Rodgers, G.F, Aikawa, A.S, Taniguchi, T, Watanabe, K, Zettl, A, Louie, S.G, Lu, J, Cohen, M.L, Crommie, M.F (2015). Molecular Self-Assembly in a Poorly Screened Environment: F4TCNQ on Graphene/BN. ACS Nano 9 (12) : 12168-12173. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: We report a scanning tunneling microscopy and noncontact atomic force microscopy study of close-packed 2D islands of tetrafluorotetracyanoquinodimethane (F4TCNQ) molecules at the surface of a graphene layer supported by boron nitride. While F4TCNQ molecules are known to form cohesive 3D solids, the intermolecular interactions that are attractive for F4TCNQ in 3D are repulsive in 2D. Our experimental observation of cohesive molecular behavior for F4TCNQ on graphene is thus unexpected. This self-assembly behavior can be explained by a novel solid formation mechanism that occurs when charged molecules are placed in a poorly screened environment. As negatively charged molecules coalesce, the local work function increases, causing electrons to flow into the coalescing molecular island and increase its cohesive binding energy. © 2015 American Chemical Society.
Source Title: ACS Nano
ISSN: 1936-0851
DOI: 10.1021/acsnano.5b05322
Rights: Attribution 4.0 International
Appears in Collections:Staff Publications

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