H2O2/UV layer-by-layer oxidation of multiwall carbon nanotubes: The “onion effect” and the control of the degree of surface crystallinity and diameter

Viviana Jehová González, Sofía Magdalena Vega-Díaz, Aarón Morelos-Gómez, Kazunori Fujisawa, Morinobu Endo, Olga Martin Cadiz, Juan Baselga Llido, Mauricio Terrones

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Hydrogen peroxide (H2O2) is an alternative oxidant and green method for the purification and functionalization of carbon nanotubes (CNTs), which works more efficiently in combination with UV radiation. In this paper, we investigated and monitored the oxidation mechanism of ethanol-synthesized and standard multi-walled carbon nanotubes. Characterization was carried out by high-resolution transmission electron microscopy (HRTEM), X-ray photo electron spectroscopy (XPS), acid/base titrations, thermo-gravimetric analysis (TGA) and Raman spectroscopy. Interestingly, we found a close correlation between oxidation time and the nature of the nanotubes. For the first time, a unique cyclic peeling of layers within MWNTs, termed “onion effect” was found. In this process, the degree of crystallinity of the outer layers significantly changed for the different peeling stages. We explain the process and how the number of layers within nanotubes gradually decreases when reaching critical acid concentrations. This method now allows the synthesis of MWCNTs with specific numbers of walls, diameter and controlled degree of crystallinity that could be effectively used for applications in biology and composites.

Original languageEnglish (US)
Pages (from-to)1027-1034
Number of pages8
JournalCarbon
Volume139
DOIs
StatePublished - Nov 2018

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Carbon Nanotubes
Peeling
Nanotubes
Carbon nanotubes
Oxidation
Acids
High resolution transmission electron microscopy
Titration
Oxidants
Hydrogen peroxide
Ultraviolet radiation
Hydrogen Peroxide
Purification
Raman spectroscopy
Thermogravimetric analysis
Ethanol
X ray photoelectron spectroscopy
Composite materials

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

González, Viviana Jehová ; Vega-Díaz, Sofía Magdalena ; Morelos-Gómez, Aarón ; Fujisawa, Kazunori ; Endo, Morinobu ; Cadiz, Olga Martin ; Llido, Juan Baselga ; Terrones, Mauricio. / H2O2/UV layer-by-layer oxidation of multiwall carbon nanotubes : The “onion effect” and the control of the degree of surface crystallinity and diameter. In: Carbon. 2018 ; Vol. 139. pp. 1027-1034.
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H2O2/UV layer-by-layer oxidation of multiwall carbon nanotubes : The “onion effect” and the control of the degree of surface crystallinity and diameter. / González, Viviana Jehová; Vega-Díaz, Sofía Magdalena; Morelos-Gómez, Aarón; Fujisawa, Kazunori; Endo, Morinobu; Cadiz, Olga Martin; Llido, Juan Baselga; Terrones, Mauricio.

In: Carbon, Vol. 139, 11.2018, p. 1027-1034.

Research output: Contribution to journalArticle

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AU - González, Viviana Jehová

AU - Vega-Díaz, Sofía Magdalena

AU - Morelos-Gómez, Aarón

AU - Fujisawa, Kazunori

AU - Endo, Morinobu

AU - Cadiz, Olga Martin

AU - Llido, Juan Baselga

AU - Terrones, Mauricio

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