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Large-scale separation of single-walled carbon nanotubes by electronic type using click chemistry
- Large-scale separation of single-walled carbon nanotubes by electronic type using click chemistry
- Um, Jo-Eun; Song, Sun Gu; Yoo, Pil J.; Song, Changsik; Kim, Woo-Jae
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- APPLIED SURFACE SCIENCE
- APPLIED SURFACE SCIENCE vol. 429, pp. 278 - 283
- SWCNT separation; sc-SWCNT; m-SWCNT; Click chemistry; Copper catalyst; 1,3 dipolar cycloaddition
- ELSEVIER SCIENCE BV
- SCIE; SCOPUS
- Document Type
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- Single-walled carbon nanotubes (SWCNTs) can be either metallic or semiconducting, making their separation critical for applications in nanoelectronics, biomedical materials, and solar cells. Herein, we investigate a novel solution-phase separation method based on click chemistry (azide-alkyne Huisgen cycloaddition) and determine its efficiency and scalability. In this method, metallic SWCNTs in metallic/semiconducting SWCNT mixtures are selectively functionalized with alkyne groups by being reacted with 4-propargyloxybenezenediazonium tetrafluoroborate. Subsequently, silica nanoparticles are functionalized with azide groups and reacted with alkyne-bearing metallic SWCNTs in the SWCNT mixture in the presence of a Cu catalyst. As a result, metallic SWCNTs are anchored on silica powder, whereas non-functionalized semiconducting SWCNTs remain in solution. Low-speed centrifugation effectively removes the silica powder with attached metallic SWCNTs, furnishing a solution of highly pure semiconducting SWCNTs, as confirmed by Raman and UV-vis/near-infrared absorption measurements. This novel separation scheme exhibits the advantage of simultaneously separating both metallic and semiconducting SWCNTs from their mixtures, being cost-effective and therefore applicable at an industrial scale. (C) 2017 Elsevier B.V. All rights reserved.
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