Spatially Controlled Nucleation of Single-Crystal Graphene on Cu Assisted by Stacked Ni.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 28024365.
- Also identified by DOI 10.1021/acsnano.6b06265.
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Abstract
In spite of recent progress of graphene growth using chemical vapor deposition, it is still a challenge to precisely control the nucleation site of graphene for the development of wafer-scale single-crystal graphene. In addition, the postgrowth patterning used for device fabrication deteriorates the quality of graphene. Herein we demonstrate the site-selective nucleation of single-crystal graphene on Cu foil based on spatial control of the local CH<sub>4</sub> concentration by a perforated Ni foil. The catalytically active Ni foil acts as a CH<sub>4</sub> modulator, resulting in millimeter-scale single-crystal grains at desired positions. The perforated Ni foil also allows to synthesize patterned graphene without any postgrowth processing. Furthermore, the uniformity of monolayer graphene is significantly improved when a plain Ni foil is placed below the Cu. Our findings offer a facile and effective way to control the nucleation of high-quality graphene, meeting the requirements of industrial processing.