We report a two-step flow method for producing a large area hierarchical organization of molecules at the interface of 1, 2, 4-trichlorobenzene and highly oriented pyrolytic graphite (HOPG), as evidenced by scanning tunneling microscopy. The first flow can induce, over millimeter scale, a uniaxial assembly of rod-like molecules of hexarylene diimide (HDI) where some misaligned HDI molecules appear as up-layer can readily be aligned via a subsequent flow.  The as-prepared superstructure allows more efficient electron transport via the p-stacking conjugated cores of molecules revealed by scanning tunneling spectroscopy.

Forced to align: Flow-induced long-range alignment of hierarchical molecular assemblies

247th National Meeting (2014)

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