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 Communjournal_title
Nature communicationsauthors
Zhao T,Xu C,Ma W,Liu Z,Zhou T,Liu Z,Feng S,Zhu M,Kang N,Sun DM,Cheng HM,Ren Wdoi
10.1038/s41467-019-12662-zsubject
Has Abstractpub_date
2019-10-24 00:00:00pages
4854issue
1issn
2041-1723pii
10.1038/s41467-019-12662-zjournal_volume
10pub_type
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