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Graphene & Graphene Oxide Support Films for TEM Application


Direct imaging of soft and hard nanomaterials


The interfaces between soft and hard nanomaterials have been the subject of extensive research.


Nanoparticles coated with molecular layers have been shown to self-assemble into novel structures that could potentially be used in electronics, sensors, and photonics. Self-assembly is influenced by the nature of molecular coatings and thus more detailed characterization of these soft materials is needed.


However, imaging surface molecules and their interfaces with nanoparticles at the atomic scale is a significant challenge. The transmission electron microscope (TEM) imaging of functionalized nanoparticles has been attempted.


However, it has not been possible to observe molecular surface layers and their interfaces with nanoparticles at the atomic level. Modern aberration- corrected TEMs can produce atomic-resolution images of soft and hard nanomaterials. However, conventional TEM support films (e.g. ultrathin amorphous carbon) limit the capabilities of these advanced microscopes because they contribute to overall electron scattering and diminish the contrast of low-atomic number specimens. The TEM imaging of the interfaces between soft and hard nanomaterials therefore requires better support films that have a lower dynamical interference with an imaging object [3].


Graphene is the ideal TEM support film. The material possesses a highly ordered structure and is atomically thin, chemically inert, structurally stable, and electrically and thermally conductive. The ultrahigh- quality graphene produced by the substrate-free gas- phase method [1, 2] has enabled the unsurpassed TEM imaging of organic molecules and the interfaces between soft and hard nanomaterials. The pure and highly-ordered sheets were used as a near-invisible support film to directly image the atoms in a gold nanoparticle and its surrounding citrate coating [3]. The results showed that the synthesized graphene can be used to directly observe nanoparticles functionalized with a diverse range of molecular coatings, such as proteins and DNA.


We offer ultrahigh-quality graphene that is produced through the substrate-free gas-phase method[1]. The


Fax (215) 412-8450 or 8452 • email: sgkcck@aol.com or stacie@ems-secure.com • www.emsdiasum Electron Microscopy Sciences In PA: (215) 412-8400 • Toll-Free (800) 523 3


A low-magnification image of a (1) gold nanoparticle 10 nm in diameter on a (2) transparent synthesized graphene support film, (3) the vacuum, and (4) a lacey carbon support.


A typical low- magnification TEM image of crumpled and randomly oriented large- area graphene sheets suspended on a lacey carbon TEM grid.


An atomic-resolution image of a 10 nm gold nanoparticle and its surrounding citrate cap- ping agent on a synthesized graphene support film.


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