Chemical oxidation of multiwalled carbon nanotubes

The effect of oxidation on the structural integrity of multiwalled carbon nanotubes through acidic and basic agents has been studied

V. Datsyuk; M. Kalyva; K. Papagelis; J. Parthenios; D. Tasis; A. Siokou; I. Kallitsis; C. Galiotis

2008

Scholarcy highlights

  • The effect of oxidation on the structural integrity of multiwalled carbon nanotubes through acidic and basic agents has been studied
  • Electron microscopy and thermogravimetric analysis clearly revealed that the nitric acid-treated material under reflux conditions suffered the highest degree of degradation, such as, nanotube shortening and additional defect generation in the graphitic network
  • Basic oxidative treatment led to the complete removal of amorphous carbon and metal oxide impurities but the structural integrity was found to be intact
  • X-ray photoelectron spectroscopy was employed to confirm the different functionalities produced for each oxidation agent, whereas titration measurements determined the relative concentration of carboxylic functions onto the graphitic surface
  • A general relationship between the chemical treatment and the amount of non-graphitic carbon was established by means of Raman spectroscopy measurements
  • The possibility of controlling the required amount of functionality, carboxylic and hydroxyl, via these oxidation procedures is discussed

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