Graphene Oxide as a Monoatomic Blocking Layer

Monolayer graphene oxide (mGO) is shown to effectively protect molecular thin films from reorganization and function as an atomically thin barrier for vapor-deposited Ti/Al metal top electrodes. Fragile organic Langmuir–Blodgett (LB) films of C22 fatty acid cadmium salts (cadmium(II) behenate) were...

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Bibliographic Details
Published in:ACS nano 2012-09, Vol.6 (9), p.8022-8029
Main Authors: Petersen, Søren, Glyvradal, Magni, Bøggild, Peter, Hu, Wenping, Feidenhans'l, Robert, Laursen, Bo W
Format: Article
Language:English
Subjects:
Atomic force microscopy
Cadmium
Crystallization - methods
Electric Conductivity
Electrodes
Graphene
Graphite - chemistry
Magnesium oxide
Materials Testing
Nanostructure
Nanostructures - chemistry
Nanostructures - ultrastructure
Oxides
Oxides - chemistry
Particle Size
Reflectivity
X-rays
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Summary:Monolayer graphene oxide (mGO) is shown to effectively protect molecular thin films from reorganization and function as an atomically thin barrier for vapor-deposited Ti/Al metal top electrodes. Fragile organic Langmuir–Blodgett (LB) films of C22 fatty acid cadmium salts (cadmium(II) behenate) were covered by a compressed mosaic LB film of mGO flakes. These hybrid LB films were examined with atomic force microscopy (AFM) and X-ray reflectivity, both with and without the metal top electrodes. While the AFM enabled surface and morphology analysis, the X-ray reflectivity allowed for a detailed structural depth profiling of the organic film and mGO layer below the metal top layers. The structure of the mGO-protected LB films was found to be perfectly preserved; in contrast, it has previously been shown that metal deposition completely destroys the first two LB layers of unprotected films. This study provides clear evidence of the efficient protection offered by a single atomic layer of GO.
ISSN:1936-0851
1936-086X
DOI:10.1021/nn302628q