Over the past few years, many efforts have been devoted to growing single-crystal graphene due to its great potential in future applications. However, a number of issues remain for single-crystal graphene growth, such as control of nanoscale defects and the substrate-dependent nonuniformity of graphene quality. In this work, we demonstrate a possible route toward single-crystal graphene by combining aligned nucleation of graphene nanograins on Cu/Ni (111) and sequential heat treatment over pregrown graphene grains. By use of a mobile hot-wire CVD system, prealigned grains were stitched into one continuous film with up to ∼97% single-crystal domains, compared to graphene grown on polycrystalline Cu, which was predominantly high-angle tilt boundary (HATB) domains. The single-crystal-like graphene showed remarkably high thermal conductivity and carrier mobility of ∼1349 W/mK at 350 K and ∼33 »600 (38 »400) cm2V-1s-1for electrons (holes), respectively, which indicates that the crystallinity is high due to suppression of HATB domains.
|Number of pages||9|
|Publication status||Published - 2022 Jul 13|
Bibliographical noteFunding Information:
This research was supported by the Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (Grant 2017-M3D1A1039558), supported by Characterization of Mechanical/Thermal/Chemical Properties of EUV Absorption/Transmission Materials through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (Grant 2020-M3H4A3081882), supported by Characterization Platform for Advanced Materials funded by Korea Research Institute of Standards and Science (Grant KRISS-2021-GP2021-0011), and supported by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (Grant 2020-M3D1A1110522). Also, G.-H.L. acknowledges support from the National Research Foundation of Korea (NRF) (Grant 2021-R1A2C3014316).
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering