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Ultrastrong Freestanding Graphene Oxide Nanomembranes with Surface-Enhanced Raman Scattering Functionality by Solvent-Assisted Single-Component Layer-by-Layer Assembly
journal contribution
posted on 2016-06-22, 00:00 authored by Rui Xiong, Kesong Hu, Shuaidi Zhang, Canhui Lu, Vladimir V. TsukrukWe
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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surface areaultrasmooth nanomembranessquare centimetersuniform0.5 GParGO filmsassembly processmetal monolayergraphene oxide550 nmsurface chemical modification5 nmconformally coatUltrastrong Freestanding Graphene Oxide Nanomembranes3 nm120 GPaultrastrong freestanding graphene oxideRaman signaturesilver nanoplatesgraphene oxide flakesLbL nanomembranesAg nanostructures
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