[Introduction] Graphene is one of the most attractive organic materials due to high carrier mobility and conductivity. Various reports suggested producing graphene with sub-10 nm width, called graphene nanoribbons (GNRs), to make the finite band gap1). In our previous work, sub-10 nm GNRs can be obtained by opening single-walled carbon nanotubes (SWNTs) along a line or longitudinal unzipping2). Although this synthesis process can produce sub-10 nm width GNR and is suitable for mass production, the application of unzipped GNR is still limited because of the difficulty to separate the GNRs from excess SWNTs, and to assemble the GNRs to make electronic devices. In this work, we tried to assemble and align the unzipped GNRs and separate it from the excess SWNTs using frequency dependent dielectrophoresis (DEP) method.
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