Journal
NANOSCALE
Volume 4, Issue 11, Pages 3558-3566Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2nr30606a
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Funding
- Chinese Academy of Sciences (CAS) [KGCX2-YW-370, KGCX2-EW-304-2]
- National High Technology Research and Development Program (863 Program) of China [2011AA050525]
- National Natural Science Foundation of China [20871118]
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry (TIPC), CAS
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We report a new approach for the fabrication of flexible and transparent conducting thin films via the layer-by-layer (LbL) assembly of oppositely charged reduced graphene oxide (RGO) and the benign step-by-step post-treatment on substrates with a low glass-transition temperature, such as glass and poly(ethylene terephthalate) (PET). The RGO dispersions and films were characterized by means of atomic force microscopy, UV-visible absorption spectrophotometery, Raman spectroscopy, transmission electron microscopy, contact angle/interface systems and a four-point probe. It was found that the graphene thin films exhibited a significant increase in electrical conductivity after the step-by-step post-treatments. The graphene thin film on the PET substrate had a good conductivity retainability after multiple cycles (30 cycles) of excessively bending (bending angle: 180 degrees), while tin-doped indium oxide (ITO) thin films on PET showed a significant decrease in electrical conductivity. In addition, the graphene thin film had a smooth surface with tunable wettability.
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