Cutting of single-walled carbon nanotubes (SWNT): (1) Cutting of pristine SWNT by ozonolysis; (2) Ozonolysis of functionalized SWNT; (3) Cutting ozonated SWNT by e-irradiation; (4) Cutting fluorinated SWNT by pyrolysis

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dc.contributor.advisorHauge, Robert H.en_US
dc.contributor.advisorSmalley, Richard E.en_US
dc.creatorChen, Zheyien_US
dc.date.accessioned2009-06-04T06:45:36Zen_US
dc.date.available2009-06-04T06:45:36Zen_US
dc.date.issued2006en_US
dc.description.abstractUsing perfluoropolyether as the solvent, cutting of pristine SWNT has been achieved by extensive ozonolysis with 80% carbon yield at room temperature. The intense disorder mode in the Raman spectra of ozonated SWNT indicates that extensive reaction with the sidewalls of SWNT occurs during ozonolysis. AFM provided a measure of the extent of the cutting effects. Monitoring of the evolved gases indicates CO2 was produced during the ozonolysis process with a dependence on both system pressure and temperature. During heating, FTIR analysis of gases released indicates carbon oxygen groups on the sidewalls of SWNT are released as CO2. Room temperature ozonolysis of fluorinated SWNT and phenol-sulfonated SWNT have also been studied in PFPE. For fluorinated SWNT, etching at the end caps has been demonstrated to be the dominating effect during this process. The improved suspension in 96% sulfuric acid after ozonolysis enables the cutting by ammonia peroxydisulfate without defluorination with a hydrazine treatment. PS-SWNT was found to be effectively cut by ozonolysis in a water suspension with preserved water solubility. Controlled by the electron dosage, a high energy electron beam (3MeV) has been demonstrated to cut ozonated SWNT. Besides ozonolysis, 700°C has been shown an optimal temperature to cut F-SWNT by pyrolysis in an argon atmosphere.en_US
dc.format.extent75 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS CHEM. 2006 CHENen_US
dc.identifier.citationChen, Zheyi. "Cutting of single-walled carbon nanotubes (SWNT): (1) Cutting of pristine SWNT by ozonolysis; (2) Ozonolysis of functionalized SWNT; (3) Cutting ozonated SWNT by e-irradiation; (4) Cutting fluorinated SWNT by pyrolysis." (2006) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/17870">https://hdl.handle.net/1911/17870</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/17870en_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.subjectInorganic chemistryen_US
dc.subjectPolymer chemistryen_US
dc.titleCutting of single-walled carbon nanotubes (SWNT): (1) Cutting of pristine SWNT by ozonolysis; (2) Ozonolysis of functionalized SWNT; (3) Cutting ozonated SWNT by e-irradiation; (4) Cutting fluorinated SWNT by pyrolysisen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentChemistryen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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