EMS MATERIALS SCIENCE & METROLOGY CATALOG 2019–20 EDITION TEM SUPPLIES Graphene Support Films for TEM (continued)
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 graphene created by this technique possesses a highly ordered structure that is composed of 99% carbon by mass (1% hydrogen)[2]. This graphene was used to directly image gold nanoparticles and their organic surface molecules in both conventional and atomic-resolution TEMs at a level that greatly
surpasses any current TEM support film[3].
Our graphene provides an invisible, crystalline background that enables the unrivaled TEM characterization of organic and inorganic nanomaterials.
References:
[1] Dato et al., “Substrate-Free Gas-Phase Synthesis of Graphene Sheets”, Nano Letters 8, 2012–2016 (2008).
[2] Dato et al., “Clean and highly ordered graphene synthesized in the gas phase”, Chemical Communications, 6095–6097, (2009).
[3] Lee et al., “Direct Imaging of Soft-Hard Interfaces
Additional References:
Galatzer-Levy, J. Graphene "sandwich" improves imaging of biomolecules. University of Illinois at Chicago News Center Web Site. February 4, 2014. Available at:
http://news.uic.edu/graphene-sandwich- improves-imaging-of-biomolecules. Accessed February 12, 2014.
Wang, C., Qiao, Q., Shokuhfar, T. and Klie, R. F. (2014), High-Resolution Electron Microscopy and Spectroscopy of Ferritin in Biocompatible Graphene Liquid Cells and Graphene Sandwiches. Adv. Mater.. doi: 10.1002/adma.201306069
Dato, A. and Frenklach, M., "Substrate-free microwave synthesis of graphene: experimental conditions and hydrocarbon precursors", New Journal of Physics, 12, 1367-2630 (2010).
ORDERING INFORMATION Graphene products come available in five different ways, allowing you to choose which is best for you
a) As a solution of 0.1 mg Graphene in 1 ml of Ethanol. A homogeneous solution will take less than 30 seconds to create by sonicating the Graphene-solvent mixture. One is able to coat their own grids using this solution.
b) As Graphene-enhanced lacey carbon TEM grids. 200 and 300 mesh. These grids are created by coating our existing lacey carbon grids with graphene. Through a unique drop method, solution is dispersed onto the Lacey Carbon Grid.
c) As dry, synthesized Graphene powder, 1 mg. Cat. No. Description
GF1200 GF1201 GF1202 GF1203 GF1204 GF1205
0.1 mg Graphene in 1 ml of Ethanol
Graphene-Enhanced Lacey Carbon TEM Grid 200 # Cu Graphene-Enhanced Lacey Carbon TEM Grid 200 # Ni Graphene-Enhanced Lacey Carbon TEM Grid 300 # Cu Graphene-Enhanced Lacey Carbon TEM Grid 300 # Ni Synthesized Graphene Powder, 1 mg
Qty. each each each each each each
91
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.
An atomic-resolution image of a 10 nm gold nanoparticle and its surrounding citrate capping agent on a synthesized graphene support film.
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