Title | Shaken, not stirred: collapsing a peptoid monolayer to produce free-floating, stable nanosheets. |
Publication Type | Journal Article |
Year of Publication | 2011 |
Authors | Sanii B, Kudirka R, Cho A, Venkateswaran N, Olivier GK, Olson AM, Tran H, R Harada M, Tan L, Zuckermann RN |
Journal | J Am Chem Soc |
Volume | 133 |
Issue | 51 |
Pagination | 20808-15 |
Date Published | 2011 Dec 28 |
ISSN | 1520-5126 |
Keywords | Air, Models, Molecular, Nanostructures, Nanotechnology, Peptoids, Thermodynamics, Water |
Abstract | Two-dimensional nanomaterials play a critical role in biology (e.g., lipid bilayers) and electronics (e.g., graphene) but are difficult to directly synthesize with a high level of precision. Peptoid nanosheet bilayers are a versatile synthetic platform for constructing multifunctional, precisely ordered two-dimensional nanostructures. Here we show that nanosheet formation occurs through an unusual monolayer intermediate at the air-water interface. Lateral compression of a self-assembled peptoid monolayer beyond a critical collapse pressure results in the irreversible production of nanosheets. An unusual thermodynamic cycle is employed on a preparative scale, where mechanical energy is used to buckle an intermediate monolayer into a more stable nanosheet. Detailed physical studies of the monolayer-compression mechanism revealed a simple preparative technique to produce nanosheets in 95% overall yield by cyclical monolayer compressions in a rotating closed vial. Compression of monolayers into stable, free-floating products may be a general and preparative approach to access 2D nanomaterials. |
DOI | 10.1021/ja206199d |
Alternate Journal | J. Am. Chem. Soc. |
PubMed ID | 21939206 |
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