Preparation and characterization of α-Fe nanowires located inside double wall carbon nanotubes

Jorge, José; Flahaut, Emmanuel; González-Jiménez, F.; González, Gema; González, J.; Belandria, Edgar; Broto, Jean-Marc; Raquet, Bertrand

doi:10.1016/j.cplett.2008.04.019

Cited by 35 publications

(26 citation statements)

References 16 publications

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“…At room temperature in the nonfunctionalized MWCNTs we observe mainly cementite, Fe 3 C (about 78%) and a very small amount of α‐Fe (about 3%). The observation of magnetically split spectra even at RT means that the Fe 3 C and α‐Fe particles have larger sizes than those corresponding to the paramagnetic limit . We find also Fe x C y complexes in which Fe 2+ and Fe 3+ in a high‐spin and a low‐spin state occur, respectively.…”

Section: Resultsmentioning

confidence: 69%

Influence of iron contaminations on local and bulk magnetic properties of nonfunctionalized and functionalized multi‐wall carbon nanotubes

Jamrozik

Przewoźnik

Mazurkiewicz

et al. 2013

Physica Status Solidi (a)

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We investigated Fe‐phases of iron complexes embedded in nonfunctionalized (as‐prepared) and functionalized multi‐wall carbon nanotubes (MWCNTs). Mössbauer spectroscopy is a very sensitive tool to study chemical states of iron compounds embedded in MWCNTs. It showed that the chemical treatment of the as‐prepared MWCNTs caused release of about 84% of iron and modification of the remaining iron compounds. In as‐prepared and carboxylated MWCNTs almost 80 and 75% of iron complexes in a form of Fe3C exhibited magnetic ordering even at room temperature, respectively. In MWCNT‐COONH4 only 50% of such iron compounds showed local magnetic ordering. In all cases about 2% of magnetic α‐Fe fraction was detected. Through the dc magnetization and transmission electron microscopy (TEM) measurements it was proved that cementite nanoparticles formed agglomerates and their sizes were larger than 10 nm. STM measurements indicated increased homogeneity of the surface electric properties in the case of chemically treated carbon nanotubes.

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Section: Resultsmentioning

confidence: 69%

Influence of iron contaminations on local and bulk magnetic properties of nonfunctionalized and functionalized multi‐wall carbon nanotubes

Jamrozik

Przewoźnik

Mazurkiewicz

et al. 2013

Physica Status Solidi (a)

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“…It was suggested that charge transfer between encapsulated Gd atoms and the CNT plays a crucial role in stabilizing the observed Gd-NW structures with large Gd-Gd distances which cannot be explained by simple rigid-sphere filling. 9 Such charge transfer has been reported for other encapsulated NWs, [10][11][12] resulting in a reduction in magnetization.…”

Section: Introductionmentioning

confidence: 91%

First-principles study of ultrathin (2×2) Gd nanowires encapsulated in carbon nanotubes

Parq

Kim

2010

The Journal of Chemical Physics

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Using density-functional calculations, we investigate the structural and magnetic properties of ultrathin Gd and Gd-carbide nanowires (NWs) encapsulated in narrow carbon nanotubes (CNTs). The equilibrium geometry of an encapsulated (2 x 2) Gd-NW is markedly different from that of bulk Gd crystals. The charge-density analysis shows pronounced spin-dependent electron transfer in the encapsulated Gd-NW in comparison with that of Gd-carbide NWs. We conclude that Gd-CNT hybridization is primarily responsible for both the structural difference and electron transfer in the encapsulated Gd-NW.

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“…The magnetic behaviour of filled SWCNTs is also a fast-growing topic, although theoretical works [145,[149][150][151] are still more numerous than experimental ones [12,121,122,178]. (14,14) and (15,15) The latter examples showed that, for iron, the ferromagnetic property is maintained in spite of its nanowire morphology with a nanometre-sized diameter, as a good example of an intrinsic property of the encapsulated material that is transferred to the whole hybrid material.…”

Section: A32 Electronic Properties (Transport Magnetism and Others)mentioning

confidence: 99%

“…Figures 5a.2(b) and 5a.8(c)). SWCNT-(or DWCNT-) encapsulated elements include Ru [10], Bi [1311], Co [15], Se [66], Ag [74,75,85,119,120], Au [75], Pt [75], Pd [75], and Fe [12,121,122] among others. The Bi and Se fillings are distinct from the other pure element fillings because they were inserted either from the liquid phase or the vapour phase, whereas the other fillings were inserted as intermediate compounds (e.g.…”

Section: A243 Pure Elements (As Nanowires or Nanoparticles)mentioning

confidence: 99%

Filled Carbon Nanotubes: (X@CNTs)

Sloan

Monthioux

2011

Carbon Meta‐Nanotubes

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Whilst fullerene and related materials are the most inserted molecules in carbon nanotubes (CNTs), other molecular species including Zn-diphenylporphyrin (i.e. Zn-DPP) [1], orthocarborane [2,3], metallocenes [4,5], octasiloxane [6] and squarylium dye [7], among others have been encapsulated within either single-, double-or multiple walled carbon nanotubes (SWCNTs, DWCNTs and MWCNTs, respectively) and directly imaged by either high resolution transmission electron microscopy (HRTEM) or related techniques. In tandem with these studies, one-dimensional (1D) nanowires of a wide variety of materials including multiplets of polymeric iodine chains [8,9]

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Preparation and characterization of α-Fe nanowires located inside double wall carbon nanotubes

Cited by 35 publications

References 16 publications

Influence of iron contaminations on local and bulk magnetic properties of nonfunctionalized and functionalized multi‐wall carbon nanotubes

Influence of iron contaminations on local and bulk magnetic properties of nonfunctionalized and functionalized multi‐wall carbon nanotubes

First-principles study of ultrathin (2×2) Gd nanowires encapsulated in carbon nanotubes

Filled Carbon Nanotubes: (X@CNTs)

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