title: Robust Gold Nanoparticle Sheets by Ligand Cross-Linking at the Air-Water Interface.
abstract: We report the results of cross-linking of two-dimensional gold nanoparticle (Au-NP) assemblies at the air-water interface in situ. We introduce an aqueous soluble ruthenium benzylidene catalyst into the water subphase to generate a robust, elastic two-dimensional network of nanoparticles containing cyclic olefins in their ligand framework. The most striking feature of the cross-linked Au-NP assemblies is that the extended connectivity of the nanoparticles enables the film to preserve much of its integrity under compression and expansion, features that are absent in its non-cross-linked counterparts. The cross-linking process appears to "stitch" the nanoparticle crystalline domains together, allowing the cross-linked monolayers to behave like a piece of fabric under lateral compression.
authors.affiliation: Department of Polymer Science and Engineering, University of Massachusetts , Amherst, Massachusetts 01003, United States.
authors.forename: Irem
authors.initials: I
authors.lastname: Kosif
authors.affiliation: Department of Polymer Science and Engineering, University of Massachusetts , Amherst, Massachusetts 01003, United States.
authors.forename: Katrina
authors.initials: K
authors.lastname: Kratz
authors.forename: Siheng Sean
authors.initials: SS
authors.lastname: You
authors.forename: Mrinal K
authors.initials: MK
authors.lastname: Bera
authors.forename: Kyungil
authors.initials: K
authors.lastname: Kim
authors.forename: Brian
authors.initials: B
authors.lastname: Leahy
authors.affiliation: Department of Polymer Science and Engineering, University of Massachusetts , Amherst, Massachusetts 01003, United States.
authors.forename: Todd
authors.initials: T
authors.lastname: Emrick
authors.forename: Ka Yee C
authors.initials: KY
authors.lastname: Lee
authors.forename: Binhua
authors.identifier: 0000-0001-5932-4905
authors.initials: B
authors.lastname: Lin
keywords: 2D freestanding self-assembly; Langmuir monolayer; cross-linking nanoparticles; liquid surface X-ray scattering; mechanical response of nanoparticle membranes; nanoparticle film; optical video microscopy