Measurement of the ideal strength of graphene nanosheets
T.I. Mazilova1, N. Wanderka2, E.V. Sadanov1, and I.M. Mikhailovskij1
1National Science Center “Kharkov Institute of Physics and Technology” 1 Akademicheskaya Str., Kharkov 61108, Ukrain
2Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
Received March 13, 2018, published online July 26, 2018
The uniaxial tensile strength of graphene nanosheets at 77 K is determined by the method of loading two-dimensional nanoobjects with strong electric fields. It is shown that for graphene sheets with a width in the interval 0.5–2.8 nm, the maximum strength values within the measurement errors do not depend on their dimensions. The average strength, due to significant statistical dispersion, is 43% lower than its maximum value (92 GPa). The strength of graphene nanosheets is almost an order of magnitude greater than the strength of nanoneedle samples made from the original carbon fibers. The absence of a dimensional dependence of the graphene nanosheets strength on their width indicates the achievement of the ideal strength of these objects.
Key words: graphene, nanosheet, strength, electric field, field ion microscopy.