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Oxidation of single-walled carbon nanotubes under controlled chemical conditions.pdf3.69 MBAdobe PDFThumbnail
Type: Artigo de Periódico
Title: Oxidation of single-walled carbon nanotubes under controlled chemical conditions
Author: Porto, Arthur Barra
Silva, Glaura G.
Santos, Hélio Ferreira dos
Oliveira, Luiz Fernando Cappa de
Resumo: -
Abstract: Single-walled carbon nanotubes are oxidized in the presence of H2SO4/HNO3 mixtures containing distinct concentrations of the nitronium ion, [NO2+]. The spectroscopic analyses of the final samples suggest a higher structural disorder in the oxidized systems with increasing [NO2+]. This is due to a considerable oxygen amount on the tube surface, reaching up to 30%, depending on the reaction time and [NO2+]. Interestingly, if long reaction time is considered, the oxygen amount on the tube surface is maximum for low [NO2+] and reduces slightly for larger [NO2+]. On the other hand, the oxidation process occurs gradually at 4 h, allowing a fine control of the oxidation process. Therefore, if fine tuning of the oxidation degree is desirable, the reaction must be conducted during short time (4 h) using increasing [NO2+] as those obtained from 2:1, 2.5:1 and 3:1 H2SO4/HNO3 acid mixtures to produce increasing content of functionalization.
Keywords: SWCNT
Acid mixture
CNPq: -
Language: eng
Country: Brasil
Publisher: -
Institution Initials: -
Access Type: Acesso Aberto
Issue Date: Nov-2018
Appears in Collections:Artigos de Periódicos

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