Analyses of residual iron in carbon nanotubes produced by camphor/ferrocene pyrolysis and purified by high temperature annealing

Antunes, E.F.; Resende, Valdirene Gonzaga de; Mengui, U. A.; Cunha, J.B.M. da; Corat, Evaldo José; Massi, M.

doi:10.1016/j.apsusc.2011.04.090

Cited by 62 publications

(42 citation statements)

References 35 publications

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“…Bands at approximately 3445 cm -1 were observed in the spectra of all samples. That may be assigned to O-H stretching vibrations (Vukovic et al, 2009;Behnama et al, 2013). The spectrum also showed bands at 1630 cm -1 , which was assigned to the C=C stretching.…”

Section: Resultsmentioning

confidence: 95%

“…The spectrum also showed bands at 1630 cm -1 , which was assigned to the C=C stretching. It is an indication of the CNT graphitic structure presence (Zhao et al, 2013;Behnama et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

“…The carbon nanotubes samples used in this work were prepared by a chemical vapor deposition method at 850 ºC in atmospheric pressure, as previously described elsewhere (Antunes et al, 2011). This sample was labeled CNT-H.…”

Section: Methodsmentioning

confidence: 99%

“…Since their discovery by Iijima in 1991, carbon nanotubes (CNTs) have attracted extensive attention from researchers due to the extraordinary mechanical, electrical, and thermal properties that make them very promising for use in material science applications (Ma et al, 2010;Cavness et al, 2012). These properties are: the Young modulus is around 1 TPa and the maximum tensile strength can reach 300 GPa, excellent electronic properties, exceptional thermal conductivity, etc.…”

Section: Introductionmentioning

confidence: 99%

“…The thermal behavior of carbon nanotube was evaluated by using TGA 7 HT Perkin Elmer. Dispersibility tests were carried out using a total of 4 solvents whose total solubility parameter values ( Total ) were quite different (Benazzouz et al, 2014). The dispersibility classification was evaluated based on visual observations.…”

Section: Characterizationmentioning

confidence: 99%

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FERREIRA¹,

FRANCISCO²,

CIVIDANES³

et al. 2015

Anais Do Congresso Brasileiro De Engenharia Química Em Iniciação Científica - Cobeq IC 2015

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-In this work, a dispersion study of carbon nanotubes (CNTs) functionalized with carboxylic and alkanes groups in various solvents are performed. CNT was treated using H 2 SO 4 /HNO 3 , and functionalized subsequently by dodecylamine (DDA). The surface modification was confirmed by Fourier transform infrared and X-ray photoelectron spectroscopy. The thermal stabilities were studied by Thermogravimetric analysis. The dispersion state of CNTs in the solvents was based on visual observations. Evaluation of the solvent influence by itself was also made. Results confirmed the presence of oxygencontaining and alkanes groups on CNTs surfaces. Dispersion stability was strongly dependent on solvent and carbon nanotubes surface interactions, which can vary with the chemical nature of the solvent. The study of dispersion stability of the nanotubes with different solvents is relevant to the full understanding of its applications.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

See 3 more Smart Citations

Untitled

FERREIRA¹,

FRANCISCO²,

CIVIDANES³

et al. 2015

Anais Do Congresso Brasileiro De Engenharia Química Em Iniciação Científica - Cobeq IC 2015

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In Situ Grown Iron Oxides on Carbon Nanofibers as Freestanding Anodes in Aqueous Supercapacitors

et al. 2018

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Iron oxides are promising materials for application in supercapacitors owing to their high theoretical redox capacitance (2299 F g À1 ). Nevertheless, iron oxide nanostructures experience constant stress during cycling due to repeated expansion and contraction resulting in structural degradation. Such structural instability makes it challenging to develop freestanding and binderfree iron oxide-based electrodes with superior electrochemical performance. In this work, the authors report a facile way to fabricate iron-based carbon nanofibers using a simple and fast technique of electrospinning followed by an in situ electrochemical conversion. The final composite electrode consists of iron oxide embedded in carbon nanofibers which possesses a robust contact and support in addition to freestanding and binder-free nature. The electrodes exhibit a capacitance of 460 F g À1 at a galvanostatic discharge current density of 1 A g À1 and retains $82% of its capacitance after 5000 cycles in a wide negative potential window of 1.3 V. Extensive spectroscopic investigation is conducted to monitor phase transformation of the electrodes during oxidation and reduction to provide a understanding of the redox mechanism during electrochemical cycling.

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Cure study of epoxy resin reinforced with multiwalled carbon nanotubes by Raman and luminescence spectroscopy

Cividanes

Brunelli

Antunes

et al. 2012

J of Applied Polymer Sci

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Carbon nanotubes (CNTs) were annealed at high temperature under vacuum, followed by a chemical treatment using acids and ethylenediamine. The presence of acid and amine chemical groups on CNT surface was confirmed by infrared spectra. The amount of iron remaining in the CNTs after the treatments was evaluated by thermogravimetry and by energy dispersion spectroscopy. The crystalline property of CNTs was evaluated by Raman spectroscopy, showing that the acid treatment performed after the thermal treatment did not damage the nanotubes walls. Micrographs showed that the most dispersed CNTs were obtained after the amine functionalization step. The curing process of the neat resin and composites was studied by Raman and Luminescence spectroscopies and both techniques showed similar results. The presence of CNTs, functionalized or not, increased the cure degree of the epoxy resin when the same cure time was used in the comparison. Nanocomposites synthesized with annealed CNT and acid-treated CNT had cure rates considerably higher at the beginning of the reaction. The difference in the cure rate was explained by means of the sample's homogeneity and the presence of chemical groups.

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Analyses of residual iron in carbon nanotubes produced by camphor/ferrocene pyrolysis and purified by high temperature annealing

Cited by 62 publications

References 35 publications

Untitled

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In Situ Grown Iron Oxides on Carbon Nanofibers as Freestanding Anodes in Aqueous Supercapacitors

Cure study of epoxy resin reinforced with multiwalled carbon nanotubes by Raman and luminescence spectroscopy

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