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June 13, 2011 - Volume 89, Number 24
- p. 33
Science & Technology Concentrates
Adapted from Angew. Chem. Int. Ed.
Phenyl-modified polysiloxane films selectively peel away metallic nanotubes.
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Science & Technology Concentrates
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Taking a cue from Nobel Prize-winning physicists who prepared graphene with adhesive tape, a research team has developed sticky polymer films to separate metallic and semiconducting single-walled carbon nanotubes (Angew. Chem. Int. Ed., DOI: 10.1002/anie.201101700). Fabrication of these nanotubes typically yields a mixture of the two types. In the past, researchers separated them by selectively destroying one nanotube type or by using solution-based methods such as dielectrophoresis. Researchers led by Jin Zhang of China’s Peking University have now demonstrated a less labor-intensive separation of the nanotubes using polydimethylsiloxane thin films modified with either amine or phenyl groups. When pressed onto an array of nanotubes and peeled away, amine-terminated tapes bind to and remove semiconducting nanotubes. Likewise, phenyl-terminated tapes remove metallic nanotubes. Stanford University’s Zhenan Bao, who has sorted nanotubes with chemically functionalized surfaces, says methods like this one that harness the power of molecule-nanotube interactions “will be highly desirable for low-cost electronics.”
Adapted from Angew. Chem. Int. Ed.
STICKY SEPARATION This schematic shows how phenyl-modified polysiloxane films can selectively peel away metallic carbon nanotubes from a nanotube mixture. Films modified with amine groups similarly remove semiconducting nanotubes.
- Chemical & Engineering News
- ISSN 0009-2347
- Copyright © 2011 American Chemical Society
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