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Paper   IPM / CMNL / 14883
Condensed Matter National Laboratory
  Title:   Superflexibility of graphene oxide
1.  Philippe Poulin
2.  Rouhollah Jalili
3.  Wilfrid Neri
4.  Frederic Nallet
5.  Thibaut Divoux
6.  Annie Colin
7.  Seyed Hamed Aboutalebi
8.  Gordon Wallace
9.  Cecile Zakri
  Status:   Published
  Journal: PNAS
  No.:  40
  Vol.:  113
  Year:  2016
  Pages:   11088-11093
  Editor:  David A. Weitz
  Supported by:  IPM
Graphene oxide (GO), the main precursor of graphene-based materials made by solution processing, is known to be very stiff. Indeed, it has a Young's modulus comparable to steel, on the order of 300 GPa. Despite its very high stiffness, we show here that GO is superflexible. We quantitatively measure the GO bending rigidity by characterizing the flattening of thermal undulations in response to shear forces in solution. Characterizations are performed by the combination of synchrotron X-ray diffraction at small angles and in situ rheology (rheo-SAXS) experiments using the high X-ray flux of a synchrotron source. The bending modulus is found to be 1 kT, which is about two orders of magnitude lower than the bending rigidity of neat graphene. This superflexibility compares with the fluidity of self-assembled liquid bilayers. This behavior is discussed by considering the mechanisms at play in bending and stretching deformations of atomic monolayers. The superflexibility of GO is a unique feature to develop bendable electronics after reduction, films, coatings, and fibers. This unique combination of properties of GO allows for flexibility in processing and fabrication coupled with a robustness in the fabricated structure.

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