Can we judge whether the nucleis of CVD graphene would growing to single crystal or not? What conditions should the initial nuclei equipped ? Should we consider the relationship between the nucleis with the substrate used? Some advice, please.
dear Zong, the more seeds you have the higher is the risk of grain boundaries causing by various structural orientations of the different growing crystallites. That do not happen, if these growing crystals get a structural information (fit to the host lattice) from the substrate.
regards Gunther
Dear Gunther,thanks for your answer. What do you mean that the epitacial graphene should fit the host lattice? If there are some chemical bonds, would the single crystal especially single crystal graphene be synthesized? And why?
dear Zong,
good point. If you can not do van der Waals growth you can't avoid the bonds. On the other hand, these bonds unfortunately reduce the high mobility of graphene , because the "free" electrons are trapped. On the other hand, the host lattice "helps" the C atoms to order in required structure (like on Nickel). If you have it on hex host with some chem. bonds you need a developed technique to remove it (PDMA, intercalation, . ) w/o any additional defects.
Additionally I would observe, if caused by the opposite thermal extension some wrinkles happen in graphene during cooling down to room T after growth (the more bonds to host, the higher the strain - that's why vdW growth has some charme :-)
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