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|Title:||Comparative temporal analysis of multiwalled carbon nanotube oxidation reactions: Evaluating chemical modifications on true nanotube surface|
|Title of periodic:||Applied Surface Science|
|Authors:||Pacheco, Flávia G.|
Cotta, Alexandre A. C.
Gorgulho, Honória F.
Santos, Adelina Pinheiro
Macedo, Waldemar Augusto de Almeida
Furtado, Cláscídia Aparecida
|Affiliation:||Centro de Desenvolvimento da Tecnologia Nuclear, CDTN, Belo Horizonte, MG, Brasil|
Universidade Federal de São João del Rei, São João Del Rei, MG, Brasil
|Abstract:||The influence of extensive purification on oxidized multiwalled carbon nanotube surface composition was studied through the characterization and differentiation of the actual surface submitted to three oxidation methods: microwave-assisted acid oxidation, hydrogen peroxide reflux, and Fenton reaction. The oxidized samples were purified by a multi-step procedure including the sequential use of basic reflux and dispersion in dimethylformamide (DMF). The results showed a significant increase in the amount of oxidation debris with hydrogen peroxide and Fenton reaction times longer than 8 h and strong surface characteristic modification. With regard to sample purification, basic reflux led to a reduction in oxygenated group concentration of only 10% in the samples treated by acid oxidation. On the other hand, the subsequent use of DMF led to a further decrease in concentration of 39%, proving to be a more efficient method for the removal of oxidation debris.|
|Appears in Collections:||Artigo de periódico|
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