@Article{AntunesReMeCuCoMa:2011:AnReIr,
               author = "Antunes, E. F. and Resende, V. G. and Mengui, U. A. and Cunha, J. 
                         B. M. and Corat, E. J. and Massi, M.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "Analyses of residual iron in carbon nanotubes produced by 
                         camphor/ferrocene pyrolysis and purified by high temperature 
                         annealing",
              journal = "Applied Surface Science",
                 year = "2011",
               volume = "257",
               number = "18",
                pages = "8038--8043",
                month = "July",
             keywords = "RAMAN-SPECTRA, MOSSBAUER-SPECTROSCOPY, PURIFICATION, PRESSURE, 
                         CARBIDES, PLASMA, GROWTH, BAND. Carbon nanotubes, Purification, 
                         Annealing, Mossbauer spectrocopy, Camphor, XPS.",
             abstract = "A detailed analysis of iron-containing phases in multiwall carbon 
                         nanotube(MWCNT) powder was carried out. The MWCNTs were produced 
                         by camphor/ferrocene and purified by high temperature annealing in 
                         an oxygen-free atmosphere (N(2) or VC). Thermogravimetric 
                         analysis, Mossbauer spectroscopy, X-ray diffraction and X-ray 
                         photoelectron spectroscopy enabled the evaluation of the residual 
                         iron in MWCNTs after purification. The VC treatments provided 
                         MWCNTs with a purity degree higher than 99%. Moreover, Raman 
                         spectroscopy revealed a significant improvement in graphitic 
                         ordering after thermal annealing. A brief description of the 
                         mechanism of iron removal was included. We highlight the mobility 
                         of iron atoms through graphitic sheets and the large contact angle 
                         of iron clusters formed on MWCNT surfaces at high temperatures. 
                         (C) 2011 Elsevier B.V. All rights reserved.",
                  doi = "10.1016/j.apsusc.2011.04.090",
                  url = "http://dx.doi.org/10.1016/j.apsusc.2011.04.090",
                 issn = "0169-4332",
             language = "en",
        urlaccessdate = "16 maio 2024"
}