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Evaluation of residual iron in carbon nanotubes purified by acid treatments |
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| Authors: | E.R. Edwards E.F. Antunes E.C. BotelhoM.R. Baldan E.J. Corat |
| Affiliation: | a São Paulo State University - UNESP, Av. Dr. Ariberto Pereira da Cunha, 333, CEP: 12.516-410 CP:20, Guaratinguetá, SP, Brazil b National Institute for Space Research - INPE, Av. dos Astronautas, 1758, CEP: 12.254-97, São José dos Campos-SP, Brazil c Aeronautical Institute of Technology - ITA, Praça Marechal Eduardo Gomes, 50, CEP: 12.228-900, São José dos Campos-SP, Brazil |
| Abstract: | A detailed analysis by X-ray photoelectron spectroscopy was carried out on multi-walled carbon nanotube (MWCNT) surfaces after non-oxidative and oxidative purification treatments in liquid-phase. The MWCNT were produced by pyrolysis of camphor and ferrocene, that provides a high yield but with high iron contamination (∼15% wt). The elimination and/or oxidation of iron nanoparticles were monitored by Fe2p and O1s core level. Oxygen-based functional groups attachment was also investigated by C1s fitting. The effectiveness of each treatment in iron removal was evaluated by thermogravimetric analysis (TGA) and atomic absorption spectroscopy (AAS). The integrity of the MWCNT structure was verified by Raman spectroscopy (RS) and transmission electron microscopy (TEM). A purity degree higher than 98% was achieved only with non-oxidative treatments using sonification process. |
| Keywords: | Iron purification XPS MWCNT Acid treatment Camphor Ferrocene |
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