Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 32, Pages 16283-16287Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm33385f
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Funding
- National Basic Research Program of China [2010CB934700]
- Key Grant Project of Chinese Ministry of Education [309010]
- Frontier Research Foundation of Tianjin Municipal [08JCZDJC17800]
- Fund of Key Laboratory of Advanced Ceramics and Machining Technology (Tianjin University) Ministry of Education [ACMT-2008-03]
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Precise unzipping of carbon nanotubes (CNTs) is achieved using flattened carbon nanotubes (F-CNTs) as the starting material and using acid to cut along the folded edges, as these high energy sites are preferentially attacked to yield regular graphene nanoribbons (GNRs). All-bilayer GNRs with narrow uniform width (8-12 nm) and straight edges are fabricated by unzipping flattened double-wall CNTs (F-DWCNTs) using mixed acids of H2SO4 and KMnO4. Transmission electronic microscopy observations confirm the localized and directional unzipping of the F-DWCNTs and the formation of regular bilayer GNRs. The oxidation temperature and acid concentration control the degree of oxidation, the extent of unzipping, and the exfoliation of F-DWCNTs from their bundles. Under certain conditions, assemblies of interconnected GNRs are formed by unzipping F-DWCNT bundles and partial exfoliation. The precise unzipping of flattened CNTs provides a reliable and scalable process for fabricating regular GNRs with controlled structures and morphologies, as demanded for applications that use them as structural, functional and electronic materials.
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