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ACS Nano. 2012 Oct 23;6(10):9110-7. doi: 10.1021/nn303352k. Epub 2012 Sep 19.

Toward the synthesis of wafer-scale single-crystal graphene on copper foils.

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1
Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, USA.

Erratum in

  • ACS Nano. 2013 Jan 22;7(1):875.
  • ACS Nano. 2013 Mar 26;7(3):2872.

Abstract

In this research, we constructed a controlled chamber pressure CVD (CP-CVD) system to manipulate graphene's domain sizes and shapes. Using this system, we synthesized large (~4.5 mm(2)) single-crystal hexagonal monolayer graphene domains on commercial polycrystalline Cu foils (99.8% purity), indicating its potential feasibility on a large scale at low cost. The as-synthesized graphene had a mobility of positive charge carriers of ~11,000 cm(2) V(-1) s(-1) on a SiO(2)/Si substrate at room temperature, suggesting its comparable quality to that of exfoliated graphene. The growth mechanism of Cu-based graphene was explored by studying the influence of varied growth parameters on graphene domain sizes. Cu pretreatments, electrochemical polishing, and high-pressure annealing are shown to be critical for suppressing graphene nucleation site density. A pressure of 108 Torr was the optimal chamber pressure for the synthesis of large single-crystal monolayer graphene. The synthesis of one graphene seed was achieved on centimeter-sized Cu foils by optimizing the flow rate ratio of H(2)/CH(4). This work should provide clear guidelines for the large-scale synthesis of wafer-scale single-crystal graphene, which is essential for the optimized graphene device fabrication.

PMID:
22966902
DOI:
10.1021/nn303352k
[Indexed for MEDLINE]

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