Izvorni znanstveni članak
Using Nonionic Surfactants for Production of Semiconductor-type Carbon Nanotubes by Gel-based Affinity Chromatography
Varun Shenoy Gangoli
; Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA
Juyan Azhang
; Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA
Taryn T. Willett
; Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA
Sean A. Gelwick
; Department of Biochemistry, Earlham College, Richmond, IN, USA
Erik H. Haroz
; Department of Electrical and Computer Engineering, Rice University, Houston, TX, USA
Junichiro Kono
; Department of Electrical and Computer Engineering, Rice University, Houston, TX, USA
Robert H. Hauge
; Department of Chemistry, Rice University, Houston, TX, USA
Michael S. Wong
; Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA; Department of Chemistry, Rice University, Houston, TX, USA; Department of Civil and Environmental Engineering, Rice University, Houston, TX, USA; Department of Materia
Sažetak
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.
Ključne riječi
carbon nanotube; semiconductor; single-wall carbon nanotubes (SWCNT); separation; affinity chromatography
Hrčak ID:
142631
URI
Datum izdavanja:
1.1.2014.
Posjeta: 1.010 *