Tune band gap - yes.
Build very narrow GNR by chemical way - yes (see work of Klaus Mullen's group).
Challenges: chemically we can build only armchair GNR. How to synthesize zig-zag?
Etching of graphene by metal nanoparticles or plasmas can now provide only about 10nm width GNR with uncontrollable shape of the edges.
Tune band gap - yes.
Build very narrow GNR by chemical way - yes (see work of Klaus Mullen's group).
Challenges: chemically we can build only armchair GNR. How to synthesize zig-zag?
Etching of graphene by metal nanoparticles or plasmas can now provide only about 10nm width GNR with uncontrollable shape of the edges.
Thank you ... I will get to you after going through the details you mentioned...
look at James Tour's work on the longitudinal unzipping of carbon nanotubes to form graphene nanoribbons. Nature 2009.
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