Effect of Cooling Condition on Chemical Vapor Deposition Synthesis of Graphene on Copper Catalyst
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- 作者：Dong Soo Choi ; Keun Soo Kim ; Hyeongkeun Kim ; Yena Kim ; TaeYoung Kim ; Se-hyun Rhy ; Cheol-Min Yang ; Dae Ho Yoon ; Woo Seok Yang
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2014
- 出版时间：November 26, 2014
- 年：2014
- 卷：6
- 期：22
- 页码：19574-19578
- 全文大小：310K
- ISSN：1944-8252
文摘
Here, we show that chemical vapor deposition growth of graphene on copper foil is strongly affected by the cooling conditions. Variation of cooling conditions such as cooling rate and hydrocarbon concentration in the cooling step has yielded graphene islands with different sizes, density of nuclei, and growth rates. The nucleation site density on Cu substrate is greatly reduced when the fast cooling condition was applied, while continuing methane flow during the cooling step also influences the nucleation and growth rate. Raman spectra indicate that the graphene synthesized under fast cooling condition and methane flow on cool-down exhibit superior quality of graphene. Further studies suggest that careful control of the cooling rate and CH4 gas flow on the cooling step yield a high quality of graphene.