Effect of nucleation density on the crystallinity of graphene grown from mobile hot-wire-assisted CVD

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 36
  • Download : 0
Chemical vapor deposition (CVD) is widely used for producing high-quality graphene in large area. However, grain boundaries (GBs) are inevitably generated when isolated graphene domains, grown from numerous graphitic nuclei, unify, resulting in severe degradation of intrinsic material properties of graphene. Using mobile hot-wire-assisted CVD (MHW-CVD), here, we successfully demonstrated the progress toward single-crystal graphene; graphene grown from MHW-CVD on pure copper substrate generally has large density of high angle tilt boundary. The main strategy of the improvement is the composition control of catalytic substrate to copper-nickel alloy (4.25 at% of Ni), via both increasing the initial density of graphitic nuclei and facilitating the rotations of isolated graphene domains during the recrystallization process of 2D graphene. Compared to graphene grown from the pure copper substrate, the areal density of the single-crystal graphene from the alloy increases from 22% to 88%. The improvement of electrical property of graphene is also confirmed by the measurement of sheet resistance and mobility whose value is enhanced to 40% and 17%, respectively. Our findings will likely benefit facile CVD synthesis of large-area, high-quality graphene for future thermal, electronic or mechanical devices.
Publisher
IOP PUBLISHING LTD
Issue Date
2019-01
Language
English
Article Type
Article
Keywords

CHEMICAL-VAPOR-DEPOSITION; POLYCRYSTALLINE GRAPHENE; GRAIN-BOUNDARIES; HIGH-QUALITY; LARGE-AREA; COPPER; TRANSPORT; FILMS; MONOLAYER

Citation

2D MATERIALS, v.6, no.1

ISSN
2053-1583
DOI
10.1088/2053-1583/aae21f
URI
http://hdl.handle.net/10203/246290
Appears in Collection
MS-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0