Synthesis and properties of magnetically functionalized carbon nanotubes

Basaev, A. S.; Bokhonov, Boris B.; Demidenko, Olga; Лабунов, В. А.; Маковецкий, Г. И.; Прудникова, Е. Л.; Reznev, A. A.; Saurov, A. N.; Fedosyuk, V. M.; Fedotova, Yu. A.; Shulitskii, B. G.; Yanushkevich, K. I.

doi:10.1134/s199507800803004x

Cited by 9 publications

(8 citation statements)

References 3 publications

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“…The relative contribution of -Fe and -Fe phases for 5% and 10% samples is almost the same, but for 1% it is comparatively higher. Sextet S 1 should be assigned to the cementite phase Fe 3 C in strong correlation with X-ray diffraction data [23]. It is important to note the presence of nonmagnetic FeC 2 phase characterized with quadrupole doublet D. The relationship between contributions of Fe 3 C and FeC 2 phases revealed the dependence on c x in these samples.…”

Section: Resultssupporting

confidence: 53%

“…As compared to our results summarized in Table 1, where the concentration of the feeding solution was the same (c x = 10%), the contribution of Fe-containing phases was different: Fe 3 C ~80% instead of ~50% (see Table 1). In our previous paper [23], the content of cementite phase was even higher (~90%). The specific feature of these experiments is the duration of CNT synthesis process: 1 min (for the 1 st set of samples, see Table 1); 4 min (for the 2 nd set of samples, see Table 2), and 5 min for the samples considered in [23].…”

Section: Resultsmentioning

confidence: 66%

“…In our previous paper [23], the content of cementite phase was even higher (~90%). The specific feature of these experiments is the duration of CNT synthesis process: 1 min (for the 1 st set of samples, see Table 1); 4 min (for the 2 nd set of samples, see Table 2), and 5 min for the samples considered in [23]. Therefore, the duration of the synthesis process strongly influences the contribution of iron-containing phases, i.e.…”

Section: Resultsmentioning

confidence: 66%

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Mössbauer spectroscopy investigation of magnetic nanoparticles incorporated into carbon nanotubes obtained by the injection CVD method

Prudnikava¹,

Fedotova²,

Kasiuk³

et al. 2010

Semicond. Phys. Quantum Electron. Optoelectron.

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This paper is devoted to the investigation of phase composition of the magnetic filler located inside multi-wall carbon nanotubes (CNTs) using Mössbauer spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). CNTs were obtained by the injection CVD method using ferrocenexylene solution under various conditions (i.e., the ferrocene concentration c x (1%, 5%, and 10%), slow or fast cooling down rates of the synthesis reactor, temperature in the reaction zone during synthesis), which can influence the magnetic properties of CNTs owing to different contribution of Fe-containing phases. SEM and TEM methods were applied to investigate morphology and structure of the synthesized material. It was shown that Fe 3 C phase formation is favorable at high content of the catalyst in the feeding solution (10%), relatively low temperatures (775 ºC) during CNTs synthesis, as well as long duration of the CNTs growth process (5 min). The cooling rate of the reactor after CNTs synthesis was not crucial to iron phase contribution in our experiments.

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Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 66%

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Mössbauer spectroscopy investigation of magnetic nanoparticles incorporated into carbon nanotubes obtained by the injection CVD method

Prudnikava¹,

Fedotova²,

Kasiuk³

et al. 2010

Semicond. Phys. Quantum Electron. Optoelectron.

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“…Besides, the XRD pattern exhibits a series of peaks corresponding to Fe phase (including carbides): Fe 3 C and Fe 5 C 2 . Analysis of the XRD result reveals that carbide Fe 3 C with an orthorhombic structure (space group Pbnm) dominates over the other phases of nanocomposite (approximately 90%) [32,38]. The Mössbauer spectrum collected in transmission geometry at room temperature is shown in Figure 1f, and the hyperfine parameters (subspectra) are summarized in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…The importance of the present investigation is defined by the possible applications of the obtained results. The arrays of CNTs with the intercalated ferromagnetic nanoparticles, so called magnetically functionalized CNTs (MFCNTs) [31,32], may be considered as an ideal medium for different magnetic applications. They can be used as sensors, sensitive elements of magnetometers, magnetic filters, ferrofluids, xerography, magneto-resonance imaging, magnetic hypothermia, and biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser modification of an array of vertically aligned carbon nanotubes intercalated with Fe phase nanoparticles

et al. 2013

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Femtosecond lasers (FSL) are playing an increasingly important role in materials research, characterization, and modification. Due to an extremely short pulse width, interactions of FSL irradiation with solid surfaces attract special interest, and a number of unusual phenomena resulted in the formation of new materials are expected. Here, we report on a new nanostructure observed after the interaction of FSL irradiation with arrays of vertically aligned carbon nanotubes (CNTs) intercalated with iron phase catalyst nanoparticles. It was revealed that the FSL laser ablation transforms the topmost layer of CNT array into iron phase nanospheres (40 to 680 nm in diameter) located at the tip of the CNT bundles of conical shape. Besides, the smaller nanospheres (10 to 30 nm in diameter) are found to be beaded at the sides of these bundles. Some of the larger nanospheres are encapsulated into carbon shells, which sometime are found to contain CNTs. The mechanism of creation of such nanostructures is proposed.

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Microwave absorption in nanocomposite material of magnetically functionalized carbon nanotubes

Лабунов

Danilyuk

Prudnikava

et al. 2012

Journal of Applied Physics

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The interaction of electromagnetic radiation in X and Ka bands with magnetic nanocomposite of disordered carbon nanotubes arrays has been investigated both experimentally and theoretically. Samples were synthesized on the quartz reactor walls by decomposition of ferrocene and xylene which provided random intercalation of iron phase nanoparticles in carbon nanotube array. The exhaustive characterization of the samples by means of the scanning electron microscopy, Raman spectroscopy, and x-ray photoemission spectroscopy was performed. It was found that the absorption of the electromagnetic wave monotonically increases with the frequency. To describe these experimental data, we extended the Bruggeman effective medium theory to a more complex case of a magnetic nanocomposite with randomly distributed spherical ferromagnetic nanoparticles in a conducting medium. The essential feature of the developed model is the consideration of the complex nature of the studied material. In particular, such important parameters as magnetic and dielectric properties of both the carbon nanotube medium and the nanoparticles, the volume concentration and the dimensions of the nanoparticles, the wave impedance of the resistive-capacitive shells of the conductive nanoparticles are explicitly taken into account in our model. Moreover, analysing the experimental results, we were able to obtain the frequency dependencies of permittivity and permeability of the studied nanocomposite.

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Synthesis and properties of magnetically functionalized carbon nanotubes

Cited by 9 publications

References 3 publications

Mössbauer spectroscopy investigation of magnetic nanoparticles incorporated into carbon nanotubes obtained by the injection CVD method

Mössbauer spectroscopy investigation of magnetic nanoparticles incorporated into carbon nanotubes obtained by the injection CVD method

Femtosecond laser modification of an array of vertically aligned carbon nanotubes intercalated with Fe phase nanoparticles

Microwave absorption in nanocomposite material of magnetically functionalized carbon nanotubes

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