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Controllable growth of vertically aligned graphene on C-face SiC.

ABSTRACT: We investigated how to control the growth of vertically aligned graphene on C-face SiC by varying the processing conditions. It is found that, the growth rate scales with the annealing temperature and the graphene height is proportional to the annealing time. Temperature gradient and crystalline quality of the SiC substrates influence their vaporization. The partial vapor pressure is crucial as it can interfere with further vaporization. A growth mechanism is proposed in terms of physical vapor transport. The monolayer character of vertically aligned graphene is verified by Raman and X-ray absorption spectroscopy. With the processed samples, d⁰ magnetism is realized and negative magnetoresistance is observed after Cu implantation. We also prove that multiple carriers exist in vertically aligned graphene.

SUBMITTER: Liu Y

PROVIDER: S-EPMC5052588 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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Controllable growth of vertically aligned graphene on C-face SiC.

Liu Yu Y Chen Lianlian L Hilliard Donovan D Huang Qing-Song QS Liu Fang F Wang Mao M Böttger Roman R Hübner René R N'Diaye Alpha T AT Arenholz Elke E Heera Viton V Skorupa Wolfgang W Zhou Shengqiang S

Scientific reports 20161006

We investigated how to control the growth of vertically aligned graphene on C-face SiC by varying the processing conditions. It is found that, the growth rate scales with the annealing temperature and the graphene height is proportional to the annealing time. Temperature gradient and crystalline quality of the SiC substrates influence their vaporization. The partial vapor pressure is crucial as it can interfere with further vaporization. A growth mechanism is proposed in terms of physical vapor ...[more]

PMID: 27708399

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