Controlled multi-step purification of single-walled carbon nanotubes

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dc.contributor.advisorSmalley, Richard E.en_US
dc.creatorXu, Ya-Qiongen_US
dc.date.accessioned2009-06-04T06:57:02Zen_US
dc.date.available2009-06-04T06:57:02Zen_US
dc.date.issued2005en_US
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.en_US
dc.format.extent39 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS E.E. 2005 XUen_US
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>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/17841en_US
dc.language.isoengen_US
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.en_US
dc.subjectElectronicsen_US
dc.subjectElectrical engineeringen_US
dc.subjectEngineeringen_US
dc.subjectMaterials scienceen_US
dc.titleControlled multi-step purification of single-walled carbon nanotubesen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentElectrical Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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