title: Ozonolysis of functionalized single-walled carbon nanotubes.
abstract: Room temperature ozonolysis of fluorinated SWNT and phenyl-sulfonated SWNT have been studied in perfluoropolyether (PFPE) solvents. Etching at the end caps (approximately 70 nm/hour for fluorinated SWNT/PFPE suspension with 1 g/l concentration) has been demonstrated to be the dominating effect during the ozonolysis of fluorinated SWNT. Base on characterization by AFM analysis, X-ray Photoelectron Spectroscopy (XPS) and Raman Spectroscopy, fluorination along the SWNT sidewalls protects F-SWNT from extensive functionalization by ozonolysis. An ozone reaction with fluorinated SWNT has been found to improve its solubility in 96% sulfuric acid. This allows oxidative cutting by ammonium peroxydisulfate without defluorination. In comparison to fluorinated SWNT, phenyl-sulfonated SWNT was found to be effectively and homogeneous cut by ozonolysis in a water suspension.
authors.affiliation: Department of Chemistry, Center for Nanoscale Science and Technology, Rice University, Houston, Texas 77005, USA.
authors.forename: Zheyi
authors.initials: Z
authors.lastname: Chen
authors.forename: Robert H
authors.initials: RH
authors.lastname: Hauge
authors.forename: Richard E
authors.initials: RE
authors.lastname: Smalley
mesh_terms: D003460:Crystallization / Q000379:methods*; D004987:Ethers / Q000737:chemistry*; D005466:Fluorocarbons / Q000737:chemistry*; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010126:Ozone / Q000737:chemistry*; D010316:Particle Size; D012997:Solvents / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D004987:Ethers; D005466:Fluorocarbons; D037742:Nanotubes, Carbon; D012997:Solvents; D013464:Sulfuric Acids; C078113:perfluoropolyether; D014867:Water; D010126:Ozone; C033158:sulfuric acid