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    Multimicrometer Noncovalent Monolayer Domains on Layered Materials through Thermally Controlled Langmuir-Schaefer Conversion for Noncovalent 2D Functionalization

    Year: 2017

    Journal: ACS Appl. Mater. Interfaces, Volume 9, OCT 18, page 36409–36416

    Authors: Hayes, Tyler R.; Bang, Jae Jin; Davis, Tyson C.; Peterson, Caroline F.; McMillan, David G.; Claridge, Shelley A.

    Organizations: NSF Career award [NSF-CHE 1555173]; NSF MRI grant [NSF-CHE 1531767]

    Keywords: self-assembly; noncovalent functionalization; 2D materials; self-assembled monolayer; Langmuir Schaefer transfer; polymerizable amphiphile

    As functionalized 2D materials are incorporated into hybrid materials, ensuring large-area structural control in noncovalently adsorbed films becomes increasingly important. Noncovalent functionalization avoids disrupting electronic structure in 2D materials; however, relatively weak molecular interactions in such monolayers typically reduce stability toward solution processing and other common material handling conditions. Here; we find that controlling substrate temperature during Langmuir-Schaefer conversion of a standing phase monolayer of diynoic amphiphiles on water a horizontally defiled monolayer on a 2D substrate routinely produces multimicrometer domains, atleast an order of magnitude larger than those typically achieved through drop-casting. Following polymerization, these highly ordered monolayers retain their structures during vigorous washing with solvents including water, ethanol, tetrahydrofuran, and toluene. These findings point to a convenient and broadly applicable strategy for noncovalent functionalization of 2D materials in applications that require large-area structural control, for instance, to minimize desorption at defects during subsequent solution processing.
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