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Ultrafast growth of nanocrystalline graphene films by quenching and grain-size-dependent strength and bandgap opening.

Abstract：

:Nanocrystallization is a well-known strategy to dramatically tune the properties of materials; however, the grain-size effect of graphene at the nanometer scale remains unknown experimentally because of the lack of nanocrystalline samples. Here we report an ultrafast growth of graphene films within a few seconds by quenching a hot metal foil in liquid carbon source. Using Pt foil and ethanol as examples, four kinds of nanocrystalline graphene films with average grain size of ~3.6, 5.8, 8.0, and 10.3 nm are synthesized. It is found that the effect of grain boundary becomes more pronounced at the nanometer scale. In comparison with pristine graphene, the 3.6 nm-grained film retains high strength (101 GPa) and Young's modulus (576 GPa), whereas the electrical conductivity is declined by over 100 times, showing semiconducting behavior with a bandgap of ~50 meV. This liquid-phase precursor quenching method opens possibilities for ultrafast synthesis of typical graphene materials and other two-dimensional nanocrystalline materials.

journal_name

Nat Commun

journal_title

Nature communications

authors

Zhao T,Xu C,Ma W,Liu Z,Zhou T,Liu Z,Feng S,Zhu M,Kang N,Sun DM,Cheng HM,Ren W

doi

10.1038/s41467-019-12662-z

subject

Has Abstract

pub_date

2019-10-24 00:00:00

pages

4854

issue

1

issn

2041-1723

pii

10.1038/s41467-019-12662-z

journal_volume

10

pub_type

杂志文章

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