Ex-MWNTs: graphene sheets and ribbons produced by lithium intercalation and exfoliation of carbon nanotubes.

Cano-Márquez, Abraham G; Rodríguez-Macías, Fernando J; Campos-Delgado, Jessica; Espinosa-González, Claudia G; Tristán-López, Ferdinando; Ramírez-González, Daniel; Cullen, David A; Smith, David J et al. · Nano Lett · 2009

basic_science · Level V

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Record sourced from PubMed, PMID 19260705.
Also identified by DOI 10.1021/nl803585s.
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Abstract

We found that multiwalled carbon nanotubes (MWNTs) can be opened longitudinally by intercalation of lithium and ammonia followed by exfoliation. Intercalation of open-ended tubes and exfoliation with acid treatment and abrupt heating provided the best results. The resulting material consists of: (i) multilayered flat graphitic structures (nanoribbons), (ii) partially open MWNTs, and (iii) graphene flakes. We called the completely unwrapped nanotubes ex-MWNTs, and their large number of edge atoms makes them attractive for many applications.

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