Controlled multi-step purification of single-walled carbon nanotubes

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dc.contributor.advisorSmalley, Richard E.
dc.creatorXu, Ya-Qiong
dc.date.accessioned2009-06-04T06:57:02Z
dc.date.available2009-06-04T06:57:02Z
dc.date.issued2005
dc.description.abstractA controlled and scalable multi-step purification method has been developed to remove iron impurity and non-nanotube carbon materials from raw single-walled carbon nanotubes produced in the HiPco (high pressure CO) process. In this study, iron nanoparticles, coated by carbon, are exposed and oxidized by multiple step oxidation at increasing temperatures. To avoid catalytic oxidation by iron oxide of carbon nanotubes, the exposed and oxidized iron oxide is deactivated by reaction with C2H2F4 or SF6. The iron fluorides are removed by a soxhlet extraction with a 6M HCl solution. The purity and quality of each sample were determined by thermo-gravimetric analysis (TGA), Raman spectrometry, ultraviolet-visible-near-IR (UV-vis-near-IR) spectrometry, fluorescence spectrometry and transmission electron microscope (TEM) spectroscopy. The purity and yield of SWNT are improved due to reduced catalytic activity of the iron oxide. Greater iron oxide removal also resulted from oxidation at higher temperatures.
dc.format.extent39 p.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.callnoTHESIS E.E. 2005 XU
dc.identifier.citationXu, Ya-Qiong. "Controlled multi-step purification of single-walled carbon nanotubes." (2005) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/17841">https://hdl.handle.net/1911/17841</a>.
dc.identifier.urihttps://hdl.handle.net/1911/17841
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectElectronics
dc.subjectElectrical engineering
dc.subjectEngineering
dc.subjectMaterials science
dc.titleControlled multi-step purification of single-walled carbon nanotubes
dc.typeThesis
dc.type.materialText
thesis.degree.departmentElectrical Engineering
thesis.degree.disciplineEngineering
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science
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