Journal
ACS NANO
Volume 6, Issue 9, Pages 8022-8029Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn302628q
Keywords
graphene oxide; molecular electronics; vertical devices; barrier layer; molecular interfacing; X-ray reflectivity
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Funding
- Danish-Chinese Center for Molecular Nano-electronics
- Danish National Research Foundation
- Sino-Danish Center for Research and Education
- Danish Agency for Science, Technology and Innovation [10-082711]
- National Natural Science Foundation of China [60911130231]
- DANSCATT
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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 C-22 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 dear evidence of the efficient protection offered by a single atomic layer of GO.
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