| Autor: |
Varun Shenoy Gangoli, Juyan Azhang, Taryn T. Willett, Sean A. Gelwick, Erik H. Haroz, Junichiro Kono, Robert H. Hauge, Michael S. Wong |
| Jazyk: |
angličtina |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Nanomaterials and Nanotechnology, Vol 4, Iss , p 19 (2014) |
| Druh dokumentu: |
article |
| ISSN: |
1847-9804 |
| DOI: |
10.5772/58828 |
| Popis: |
Single-wall carbon nanotubes (SWCNTs) have remarkable properties based on their electronic properties, i.e., metallic or semiconducting types, but as-grown SWCNTs contain a mixture of both types. Presented here is an improved and detailed method for producing highly enriched semiconducting SWCNTs from a colloidal suspension of as-grown SWCNTs through agarose gel column-based affinity chromatography. After a 2 wt% sodium dodecyl sulphate (SDS) aqueous dispersion of SWCNTs is passed through the gel column, metal-type SWCNTs preferentially elute out using a 1.5 wt% SDS solution. Semiconductor-type SWCNTs are subsequently recovered from the column using a 2 wt% Pluronic F77 surfactant solution eluent. The semiconductor-enriched fraction purity is in the 90-95% range, based on detailed UV- vis-NIR absorption and resonant Raman spectroscopy characterization of the particulate suspension. Semiconductor- type SWCNTs are recovered in solid form by evaporating the suspension fluid, and heating the dried sample in air to a temperature just above the Pluronic decomposition temperature. Using Pluronic and other nonionic-type surfactants can aid the scalability of the chromatographic production of semiconducting SWCNT samples. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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