Journal
ACS NANO
Volume 10, Issue 7, Pages 6702-6715Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b02012
Keywords
flexible nanomembranes; reduced graphene oxide; mechanical performance; layer-by-layer assembly; surface-enhanced Raman scattering
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Funding
- Natural Science Foundation of China [51473100]
- China Scholarship Council [201406240067]
- Air Force Office for Scientific Research [FA9550-14-1-0269]
- U.S. National Science Foundation [CBET-1401720]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1401720] Funding Source: National Science Foundation
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We report single-component ultrathin reduced graphene oxide (rGO) nanomembranes fabricated via nonconventional layer-by-layer assembly (LbL) of graphene oxide flakes, using organic solvent instead of water to provide strong complementary interactions and to ensure the uniform layered growth. This unique approach does not require regular polymeric from the assembly process or intermediate surface chemical modification. The resulting ultrastrong freestanding graphene oxide (rGO) LbL nanomembranes with a very low thickness of 3 nm (three GO monolayers) can be transferred over a large surface area across tens of square centimeters by using a facile surface-tension-assisted release technique. These uniform and ultrasmooth nanomembranes with high transparency (up to 93% at 550 nm) and high electrical conductivity (up to 3000 S/m) also exhibit outstanding mechanical strength of 0.5 GPa and a Young's modulus of 120 GPa, which are several times higher than that of other reported regular rGO films. Furthermore, up to 94 wt % of silver nanoplates can be sandwiched between 5 nm GO layers to construct a flexible freestanding protected noble metal monolayer with surface-enhanced Raman scattering properties. These flexible rGO/Ag/rGO nanomembranes can be transferred and conformally coat complex surfaces and show a cleaner Raman signature, enhanced wet stability, and lower oxidation compared to bare Ag nanostructures.
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