Structure, composition and magnetic properties of carbon nanotubes doped by Fe during the growth process

Лабунов, В. А.; Shulitski, B. G.; Prudnikava, Alena; Yanushkevich, K. I.

doi:10.1088/1742-6596/100/5/052095

Cited by 11 publications

(6 citation statements)

References 2 publications

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“…Some researchers show that ferromagnetism is determined substantially by presence of γ-Fe phase [5], α-Fe phase [8][9][10][11], Fe 3 C phase [9,12], or superposition of two [10] or three [12][13][14] mentioned phases. Previously, we observed some amount of Fe 5 C 2 in our MFCNT samples by X-ray analysis in addition to Fe 3 C and α-Fe [15].…”

Section: Introductionsupporting

confidence: 54%

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: Introductionsupporting

confidence: 54%

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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“…S3 of the Supporting Information. It is confirmed here that CNTs are multi‐wall, some of them contain nanoparticles in the channels, obviously of Fe containing phases 6.…”

Section: Resultssupporting

confidence: 75%

Multi‐level composite nanostructures based on the arrays of vertically aligned carbon nanotubes and planar graphite layers

Лабунов

Shulitski

Prudnikava

et al. 2010

Physica Status Solidi (a)

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New composite nanostructures based on two allotropic forms of carbon, the arrays of vertically aligned carbon nanotubes (CNTs) and planar graphite layers (PGL) located at the top of the arrays, so‐called “CNT–PGL nanostacks”, have been synthesized by the injection CVD method using xylene/ferrocene solution. Two‐ and three‐level nanostacks were demonstrated. The possible scenario of the growth mechanism of these nanostructures is proposed, that is, each level of the nanostack grows by the simultaneous PGL and CNT array formation on the surface of the catalyst particles previously covered by a graphene layer. At the upper surface of the catalyst particles, which is in direct contact with the reactive species, the graphene layer becomes an origin of PGL, and at the interface between catalyst and substrate it transforms into CNTs.

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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%

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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Structure, composition and magnetic properties of carbon nanotubes doped by Fe during the growth process

Cited by 11 publications

References 2 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

Multi‐level composite nanostructures based on the arrays of vertically aligned carbon nanotubes and planar graphite layers

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

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