Highly efficient exfoliation of individual single-walled carbon nanotubes by biocompatible phenoxylated dextran

Taeyun Kwon, Gyudo Lee, Hyerim Choi, Michael S. Strano, Woo Jae Kim

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Highly efficient exfoliation of individual single-walled carbon nanotubes (SWNTs) was successfully demonstrated by utilizing biocompatible phenoxylated dextran, a kind of polysaccharide, as a SWNT dispersion agent. Phenoxylated dextran shows greater ability in producing individual SWNTs from raw materials than any other dispersing agent, including anionic surfactants and another polysaccharide. Furthermore, with this novel polymer, SWNT bundles or impurities present in raw materials are removed under much milder processing conditions compared to those of ultra-centrifugation procedures. There exists an optimal composition of phenoxy groups (13.6 wt%) that leads to the production of high-quality SWNT suspensions, as confirmed by UV-vis-nIR absorption and nIR fluorescence spectroscopy. Furthermore, phenoxylated dextran strongly adsorbs onto SWNTs, enabling SWNT fluorescence even in solid-state films in which metallic SWNTs co-exist. By bypassing ultra-centrifugation, this low-energy dispersion scheme can potentially be scaled up to industrial production levels.

Original languageEnglish
Pages (from-to)6773-6778
Number of pages6
JournalNanoscale
Volume5
Issue number15
DOIs
StatePublished - 11 Jul 2013

Fingerprint

Dive into the research topics of 'Highly efficient exfoliation of individual single-walled carbon nanotubes by biocompatible phenoxylated dextran'. Together they form a unique fingerprint.

Cite this