Researchers reveal the growth of graphene near polycrystalline substrate grain boundaries

phys.org | 8/29/2018 | Staff
oxboy (Posted by) Level 4
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In a paper published in Nano, a team of researchers from the Laboratory of Graphene Mechanics (LogM), Zhejiang University, has shown how the morphological structure of a catalytic substrate influences the growth of graphene. This provides more guidance on the synthesis of high-quality graphene with less domain boundaries.

How does the morphological structure of a catalytic substrate influence the growth of graphene? Due to the effects of other environmental parameters during the chemical vapor deposition (CVD) growth of a graphene crystal, this question remains unsolved.

Graphene - Crystals - Way - CVD - Growth

However, aligned hexagonal graphene single crystals provide a more straightforward way to uncover the CVD growth behavior of graphene single crystals near the Cu grain boundaries, and prove that the lattice orientation of graphene is not influenced by these grain boundaries and only determined by the Cu crystal it is nucleated on.

A team of researchers from the Laboratory of Graphene Mechanics (LogM), Zhejiang University, has shown a clear irrelevance for the CVD growth of a graphene single crystal with the crystallinity of its grown substrate after it was nucleated, and proven that the lattice orientation of a graphene single crystal on Cu is only determined by the Cu grain it was nucleated on.

Ambient-pressure - AP - CVD - Low-pressure - LP

Using ambient-pressure (AP) CVD instead of low-pressure (LP) CVD method and carefully adjusted growth parameters, hexagonal graphene single crystals up to millimeter scale and zigzag edge structures have been successfully obtained on polycrystalline Cu surfaces. Owing to such hexagonal graphene samples with lattice orientations that...
(Excerpt) Read more at: phys.org
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