Electronic structure of the Fe-layer-catalyzed carbon nanotubes studied by x-ray-absorption spectroscopy

Yueh, C. L.; Jan, J. C.; Chiou, J. W.; Pong, W. F.; Tsai, M.‐H.; Chang, Yin-Yu; Chen, Y. Y.; Lee, Y. F.; Tseng, P. K.; Wei, Shih-Chung; Wen, Cheng‐Yen; Chen, L. C.; Chen, K. H.

doi:10.1063/1.1416165

Cited by 28 publications

(35 citation statements)

References 17 publications

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“…We observe that conduction charge from the minority spin bands is concentrated on the Fe central nanowire [9]. Mulliken population analysis [19] for the Fe 4 @(5,5) systems shows that the overall charge transfer occurs from Fe to C atom in accordance with experimental results for Fe nanocluster in CNTs [17]. The amounts of charge transfer for Fe 4 encapsulated in (5,5) and (7,7) SWNT are 0.189 e and 0.06 e per Fe atom, respectively.…”

Section: Systemsupporting

confidence: 84%

“…However the spin polarizations of Fe 4 @(5,5) is remarkably reduced to 20 % due to a strong interaction between the Fe nanowire and the C shell. This feature is attributed to a hybridization between C 2p and Fe 3d orbitals [17]. The spin polarization of Fe 4 @(7,7) with sufficiently large Fe-C distance is found to be almost the same as that for Fe 1 @(5,5).…”

Section: Systemmentioning

confidence: 73%

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Magnetism of Fe nanowires encapsulated in carbon nanotube

Lee

Jang

2004

phys. stat. sol. (c)

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We have investigated the electronic structures and magnetism of Fe nanowires encapsulated in carbon nanotube. We have calculated the magnetic moment, spin polarization, and conductance channel for Fe nanowires encapsulated in carbon nanotube. The magnetic moment of an encapsulated system is decreased compared with that of freestanding Fe nanowires and the spin polarization and conductance channel are also decreased. The decrease of magnetic moment and spin polarization is caused by a strong hybridization between the Fe nanowire and the carbon shell, The overall charge transfer occurs from Fe wire to C shell, which is consistent with experimental result. However since the Fe-C distance is large enough to have hollow region between Fe wire and C shell, the magnetic moment and spin polarization are close to those of freestanding Fe nanowire, and the conductance channel is almost same with that of freestanding Fe nanowire.

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Section: Systemsupporting

confidence: 84%

Section: Systemmentioning

confidence: 73%

Magnetism of Fe nanowires encapsulated in carbon nanotube

Lee

Jang

2004

phys. stat. sol. (c)

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“…Although the detailed electronic structure has never been clarified, it is notable that the X-EFM at 290 eV provides a specific image of ‫ء‬ state excitation. [22][23][24] The ‫ء‬ state is sensitive to chemical modification of CNTs and is probably changed by the distortions found in this study.…”

Section: -3mentioning

confidence: 95%

Imaging of charge trapping in distorted carbon nanotubes by x-ray excited scanning probe microscopy

Ishii

Hamilton

Poolton

2008

Journal of Applied Physics

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We have observed the distribution of electron trapping centers on distorted carbon nanotubes ͑CNTs͒ by a unique x-ray analysis technique that has both elemental and spatial selectivities. This technique involves the use of scanning probe microscopy ͑SPM͒ under synchrotron radiation excitation of the inner shell of carbon. The probe detects the Coulomb force that results from the relaxation of an electron bound to a defect site into the core hole state created by x-ray photon absorption. This results in a change in charge state of the defect. At the spatial resolution provided by the SPM technique, we observed the electron trapping centers distributed on the compressed and torsionally distorted CNTs. This direct association of mechanical distortion with defect sites indicates a potential risk of deterioration of electric properties during the fabrication and processing of CNT networks.

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“…Therefore, it is interesting to understand the effect of chemical modification of CNTs using halogens (F, I, Br and Cl). Different workers have been investigated the fluorine-, iodine-, bromine-treated CNTs [10][11][12] and CNTsbased nanomaterials [13][14][15] . A comprehensive study of the electronic structures and bonding properties of N-CNTs:Cl is complementary to the understanding of the properties of halogen modified CNTs.…”

Section: Introductionmentioning

confidence: 99%

“…In case of chlorine treatment 17 using dichlorocarbene compound, the surface of CNTs are modified with presence of other functional forms of carbon (i.e C-Cl, C-O and O-C=O) on the surface of CNTs by decreasing the density of C-C bonds. However, either on oxidation or chlorination it shows not only the surface modification but also changes the structural as well as electronic properties of CNTs [7][8][9][10][11][12][13][14][15][16][17][18] . We have observed from experimental results and hence theoretical calculation that chlorine bonded compounds (i.e.…”

Section: Introductionmentioning

confidence: 99%

Nitrogenated Carbon Nanotubes Functionalized with Chlorine and Oxygen: Electronic and magnetic properties for electronic/magnetic device applications

Ray

2018

Front. Res. Today

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The electronic properties, bonding structure and magnetic behaviours of oxygen-and chlorine-treated nitrogenated carbon nanotubes (N-CNTs) were studied using x-ray absorption near-edge structure (XANES), scanning photoelectron microscopy (SPEM) and PPMS measurements. The C and N K-edge XANES spectra of chlorine-treated N-CNTs consistently reveal the formation of pyridinelike N-CNTs by the observation of 1s→π*(e 2u ) antibonding and 1s→π*(b 2g ) bonding states. Features in the C K-edge XANES spectra are shifted by ~0.3 eV toward higher energies and by ~1.1 eV toward lower energies relatively to those of the more symmetrical pyridinelike and graphitelike structured N-CNTs upon chlorination and oxidation, respectively. Increases in N K-edge XANES intensities for both chlorination and oxidation reveal substitution of C-C bonds by C-N bonds consistent with the observed valence-band photoemission spectra of the decrease of the C 2s bond and the increase of the N 2s bond. The valence-band photoemission spectra obtained from SPEM images indicate that chlorination of the nanotubes enhances the C-N bonding. First-principles calculations of the partial densities of states in conjunction with C K-edge XANES data identify the presence of C-Cl bonding inchlorine treated N-CNTs. In the electron field emission of chlorination (N-CNT:Cl) and oxidation (N-CNT:O) of N-CNT shows a high current density (J) of 15.0 mA/cm 2 has been achieved on chlorination, whereas low J of 0.0052 mA/cm 2 is observed on oxidation compared to J = 1.3 mA/cm 2 for untreated N-CNT at an applied electric field E A of ~1.9 V/mm. The turn-on electric field (E TO ) was ~0.875 and 1.25 V/mm was achieved for N-CNT:-Cl and N-CNT:O, respectively, with respect to E TO = 1.0 V/mm for untreated one. The magnetic behavioural changes occurs when N-CNTs are functionalized with Cl and O respectively.

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Electronic structure of the Fe-layer-catalyzed carbon nanotubes studied by x-ray-absorption spectroscopy

Cited by 28 publications

References 17 publications

Magnetism of Fe nanowires encapsulated in carbon nanotube

Magnetism of Fe nanowires encapsulated in carbon nanotube

Imaging of charge trapping in distorted carbon nanotubes by x-ray excited scanning probe microscopy

Nitrogenated Carbon Nanotubes Functionalized with Chlorine and Oxygen: Electronic and magnetic properties for electronic/magnetic device applications

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