Abstract
Temperature Electron Magnetic Resonance (EMR) measurements of multiwalled carbon nanotubes (CNT) and carbon nanohorns (CNH) were performed in the temperature range 5.2 – 300 K. The asymmetric resonance lines with Dyson shape were observed. The g-value of multiwalled carbon nanotubes (CNT) and carbon nanohorns (CNH) was calculated. Analysis of the temperature dependences of the integral intensity of EMR spectra was carried out using the Curie-Weiss law and Curie temperature θ(CNT) = 46,6 K and θ(CNT) = 8.6 K were obtained. We showed that the localization processes observed in nanocarbon materials lead to local quantum transport of spins or carriers.
Highlights
Since their discovery by Iijima in 1991 [1] carbon nanotubes have attracted increasing attention from the material science community due to their exceptional electronic and mechanical properties [2].Carbon nanotubes are promising candidates for a variety of applications due to their uncommon and versatile electrical and mechanical properties which recently generated an active area of research [3]
The selected Electron Magnetic Resonance (EMR) spectra as a function of temperature for the carbon nanotubes (CNT) and carbon nanohorns (CNH) sample are shown in Fig. 3 and 4, respectively
The localized spin centers near defect states show Curie-like temperature dependence; by contrast, the EMR temperature dependence of conduction electron spins is close to that predicted by the Pauli magnetism
Summary
Since their discovery by Iijima in 1991 [1] carbon nanotubes have attracted increasing attention from the material science community due to their exceptional electronic and mechanical properties [2].Carbon nanotubes are promising candidates for a variety of applications due to their uncommon and versatile electrical and mechanical properties which recently generated an active area of research [3]. Magnetic and electronic properties of multiwall carbon nanotubes has been presented in [17,18,19]. The main aim of this work it characterization properties of multiwalled carbon nanotubes (CNT) and carbon nanohorns (CNH) using Electron Magnetic Resonance (EMR).
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