Sunday, January 8, 2012

Crumpled Nanopaper from Graphene Oxide


Xiaofei Ma, Michael R. Zachariah, and Christopher D. Zangmeister*
 Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
 Department of Mechanical Engineering and Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
Nano Lett., Article ASAP
DOI: 10.1021/nl203964z
Publication Date (Web): December 20, 2011

Graphene oxide (GO) in aqueous solution was aerosolized and rapidly dried to produce crumpled nanopaper-like sheets. Online size selection and aerosol mass analysis was used to determine the fractal dimension (D) of crumpled GO nanosheets as 2.54 ± 0.04. That is identical to macroscale materials, such as crumpled balls of paper and foil. Thermal reduction of crumpled GO nanosheets did not change D, even after loss of nearly 25% of the nanosheets mass. We demonstrate that D is able to be tuned by altering solvent conditions. A 10% acetone mixture increased D to 2.68 ± 0.02. Calculations of the confinement force show that crumpling of GO nanosheets is driven by the capillary force associated with rapid solvent loss.

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