Orientation dependence of magneto-resistance behaviour in a carbon nanotube rope

McIntosh, Gregory C.; Kim, G.T.; Park, J.G.; Krstić, Vojislav; Burghard, Marko; Jhang, Sung Ho; Lee, S.W.; Roth, S.; Park, Y.W.

doi:10.1016/s0040-6090(02)00592-8

Cited by 22 publications

(9 citation statements)

References 23 publications

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“…Now CNT are regarded as the most attractive building blocks for nanoelectronics: they are able to form a perfect spin-transport medium, since electron transport in them is one-dimensional and ballistic with a long spin relaxation time and weak spin-orbital effects. Also, even pure CNT, which are nonmagnetic materials, are characterized by giant magneto-resistance [3,4]. On the other hand, it is quite obvious that modification of CNT (intercalation, chemical surface modification, filling the internal cavities with different elements) would lead to significant differences in their electronic structure and properties [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of multi-walled carbon nanotubes modified with iron

Grechnev

Desnenko

Fedorchenko

et al. 2010

Low Temperature Physics

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Magnetic properties of multi-walled carbon nanotubes modified with iron (MWCNT+Fe) are studied in detail in the temperature range 4.2-300 K. Carbon encapsulated Fe nanoparticles were obtained using chemical vapor deposition method. The low-temperature SQUID magnetization measurements are supplemented by structural investigations with thermogravimetric (TG) analysis, transmission electron microscopy (TEM), x-ray diffraction spectroscopy (XRD), and scanning electron microscopy (SEM). The magnetic susceptibility of MWCNT+Fe was also studied above room temperature to provide a complete picture of magnetic phase transitions.

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Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of multi-walled carbon nanotubes modified with iron

Grechnev

Desnenko

Fedorchenko

et al. 2010

Low Temperature Physics

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“…͑6͒ in the high field regime. these l in values are averaged over since the nanotubes are partially aligned within the fiber, so the transport along the aligned tubes direction is metallic and the transport across the tubes is near the M transition, 17 and in latter, p =1 as mentioned earlier. Hence, the temperature dependence of l in indicates that the net transport is limited by the transport across the direction of aligned tubes in HPR neat.…”

Section: Analysis and Resultsmentioning

confidence: 99%

Magnetoconductance in single-wall carbon nanotubes: Electron-electron interaction and weak localization contributions

2007

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The positive and negative magnetoconductance ͑MC͒ data ͓J. Vavro et al., Phys. Rev. B 71, 155410 ͑2005͔͒ in various single-wall carbon nanotube samples are analyzed by taking into account the electron-electron interaction ͑EEI͒ contribution, in addition to the weak localization ͑WL͒ regime. The low field MC data shows an H 2 dependence, in accordance with the EEI and WL models. The contribution from EEI to the total MC is further confirmed from the universal scaling of MC relation ͓͕⌬ / T 1/2 ͖ vs ͑H / T͒ plots͔, showing that EEI plays a significant role at higher fields and lower temperatures. Intrinsic parameters such as inelastic scattering length ͑l in ͒ extracted for barely metallic sample ͑120 S / cm at 300 K͒ follow the T −3/4 dependence due to the inelastic electron-electron scattering in the dirty limit. The l in for highly conducting sample ͑3570 S / cm at 300 K͒ follows a T −0.4 dependence. The various order parameters helps us to characterize the system in a disorder-tuned metal-insulator transition scenario.

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“…SWCNTs are characterized by important electronic, thermal and mechanical properties. Thus, the SWCNT conductivity can exceed the copper conductivity more than 3 times [2][3][4][5][6], the tensile strength reaches 100 GPa, the thermal conductivity of SWCNT (up to 5800 V/mK) [7] is almost 3 times higher than that of diamond. These physical properties make carbon nanotubes promising for the use as the components of micro-and nanodevices, carbon cells of lithium batteries, electrochemical catalysis electrodes and catalyst carriers, emerging materials for implantable and wearable biofuel cells, etc.…”

Section: Introductionmentioning

confidence: 99%

“…The individual CNT conductivity can be as high as 10 7 -10 8 S/m -1 [2][3][4]. However, it drops dramatically to only 10 3 -10 5 S/m for the array composed of many nanotubes [5,6]. Currently, the preservation of electrical properties of an separate nanotube in carbon nanotube ensembles should be the important task.…”

Section: Introductionmentioning

confidence: 99%

Preparation and transport properties of oriented buckypapers with single walled carbon nanotubes

Stepina¹,

Galkov²,

Predtechenskiy³

et al. 2019

MoEM

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Buckypapers (BPs) with carbon nanotubes (CNTs) are very promising for a lot of applications, in which their high conductance, strength and small weight are required. In this work, isotropic BPs were prepared using the solution-based deposition that includes the single walled carbon nanotubes (SWCNTs) dispersion and the dispersion filtration from a solvent. To increase the BP conductivity, the orientation of the SWCNT bundles composing BPs and a following iodine doping were applied. The method of extrusion through the narrow (300 µm) gap was used for the SWCNT orientation. The temperature dependences of conductance for isotropic, oriented and doped BPs were studied to understand the effect of CNT alignment and the mechanism of transport through SWCNT BPs. It was shown that bundle orientation increases the BP conductivity from ~103 S × cm-1 to ~104 S × cm-1, and iodine doping of oriented samples additionally increase the conductivity by an order. The fluctuation – assisted tunneling between CNT bundles was used to describe the mechanism of low temperature conductivity.

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Orientation dependence of magneto-resistance behaviour in a carbon nanotube rope

Cited by 22 publications

References 23 publications

Structure and magnetic properties of multi-walled carbon nanotubes modified with iron

Structure and magnetic properties of multi-walled carbon nanotubes modified with iron

Magnetoconductance in single-wall carbon nanotubes: Electron-electron interaction and weak localization contributions

Preparation and transport properties of oriented buckypapers with single walled carbon nanotubes

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