Bulk Purification and Deposition Methods for Selective Enrichment in High Aspect Ratio Single-Walled Carbon Nanotubes.
Aqueous batch processing methods for the concurrent purification of single-walled carbon nanotube (SWNT) soot and enrichment in high aspect ratio nanotubes are essential to their use in a wide variety of electronic, structural, and mechanical applications. This manuscript presents a new route to the...
| Publicado en: | Journal of the American Chemical Society Vol. 134; no. 22; pp. 9352 - 9362 |
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| Autores principales: | , , |
| Formato: | Artículo |
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American Chemical Society
6/6/2012
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=76596914&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 76596914 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 6/6/2012 vid: 134 iid: 22 pid: 997 pub: American Chemical Society artinfo: ui: 76596914 10.1021/ja302136x ppf: 9352 ppct: 10 formats: tig: atl: Bulk Purification and Deposition Methods for Selective Enrichment in High Aspect Ratio Single-Walled Carbon Nanotubes. aug: au: Bhatt, Nidhi P. Vichchulada, Pornnipa Lay, Marcus D. affil: Department of Chemistry and Nanoscale Science and Engineering Center (NanoSEC), University of Georgia, Athens Georgia, 30602 su: Single walled carbon nanotubes Batch processing Centrifugation Soot Metal catalysts sug: subj: Single walled carbon nanotubes Batch processing Centrifugation Soot Metal catalysts ab: Aqueous batch processing methods for the concurrent purification of single-walled carbon nanotube (SWNT) soot and enrichment in high aspect ratio nanotubes are essential to their use in a wide variety of electronic, structural, and mechanical applications. This manuscript presents a new route to the bulk purification and enrichment of unbundled SWNTs having average lengths in excess of 2 ~m. Iterative centrifugation cycles at low centripetal force not only removed amorphous C and catalyst nanopartides but also allowed the enhanced buoyancy of surfactant encapsulated, unbundled, high aspect ratio SWNTs to be used to isolate them in the supernatant. UV-vis-NIR and Raman spectroscopy were used to verify the removal of residual impurities from as-produced (AP-grade) arc discharge soot and the simultaneous enrichment in unbundled, undamaged, high aspect ratio SWNTs. The laminar flow deposition process (LFD) used to form two- dimensional networks of SWNTs prevented bundle formation during network growth. Additionally, it further enhanced the quality of deposits by taking advantage of the inverse relationship between the translational diffusion coefficient and length for suspended nanoparticles. This resulted in preferential deposition of pristine, unbundled, high aspect ratio SWNTs over residual impurities, as observed by Raman spectroscopy and atomic force microscopy (AFM). pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2012 holdings: @attributes: islocal: N |
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