Role of particle size on the magnetoresistance of nano-crystalline graphite

Mandal, Guruprasad; Srinivas, V.; Rao, Vishal Govind

doi:10.1016/j.carbon.2013.01.057

Cited by 3 publications

(1 citation statement)

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“…This implies that our experimental data cannot be discussed within the frame of variable-range hopping transport [6,10]. Similar properties were observed in a single graphite microdisk [43] and for nanocrystalline graphite [44].…”

Section: Discussionmentioning

confidence: 63%

Magnetoresistance of composites based on graphitic disks and cones

Černák,

Helgesen,

Hage

et al. 2013

Preprint

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We have studied the magnetotransport of conical and disk-shaped nanocarbon particles in magnetic fields |B| ≤ 9 T at temperatures 2 ≤ T ≤ 300 K to characterize electron scattering in a three dimensional disordered material of multilayered quasi 2D and 3D carbon nanoparticles. The microstructure of the particles was modified by graphitization at temperatures 1600 • C and 2700 • C. We find clear correlations between the microstructure as seen in transmission electron microscopy and the magnetotransport properties of the particles. The magnetoresistance measurements showed a metallic nature of samples and positive magnetoconductance which is a signature of weak localization in disordered systems. We find that the magnetoconductance at low temperatures resembles quantum transport in single-layer graphene despite the fact that the samples are macroscopic and three dimensional, consisting of stacked and layered particles, which are randomly oriented in the bulk sample. This graphene-like behaviour is attributed to the very weak interlayer coupling between the graphene layers.

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Section: Discussionmentioning

confidence: 63%