Effect of current stress during thermal CVD of multilayer graphene on cobalt catalytic layer

Kazuyoshi Ueno, Hiroyasu Ichikawa, Takaki Uchida

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

To improve the crystallinity of multilayer graphene (MLG) by CVD at a low temperature, the effect of current stress during thermal CVD on a cobalt (Co) catalytic layer was investigated. The crystallinity of MLG obtained by CVD with current was higher than that without current at the same temperature. This indicates that current has effects besides the Joule heating effect. The current effects on the Co catalytic layer and the MLG growth reaction were investigated, and it was found that current had small effects on the grain size and crystal structure of the Co catalyst and large effects on the MLG growth reaction such as large grain growth and a low activation energy of 0.49 eV, which is close to the value reported for carbon surface diffusion on Co. It is considered that the enhancement of MLG growth reaction by current leads to the improved crystallinity of MLG at a relatively low temperature.

Original languageEnglish
Article number04EC13
JournalJapanese Journal of Applied Physics
Volume55
Issue number4
DOIs
Publication statusPublished - 2016 Apr 1

Fingerprint

thermal stresses
Thermal stress
Graphene
Chemical vapor deposition
Cobalt
graphene
Multilayers
cobalt
vapor deposition
crystallinity
Joule heating
Surface diffusion
surface diffusion
Grain growth
Temperature
high current
Activation energy
Crystal structure
grain size
activation energy

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Effect of current stress during thermal CVD of multilayer graphene on cobalt catalytic layer. / Ueno, Kazuyoshi; Ichikawa, Hiroyasu; Uchida, Takaki.

In: Japanese Journal of Applied Physics, Vol. 55, No. 4, 04EC13, 01.04.2016.

Research output: Contribution to journalArticle

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