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Embedding cobalt nanoparticles within carbon nanotubes improves their magnetic and dielectric properties

Obtaining stable metal nanoparticles is of high interest for various applications such as catalysis, batteries, supercapacitors and electro-magnetic devices. Cobalt / multi-walled carbon nanotubes (MWCNT) hybrids with an original set of magnetic and electric properties were formed by casting Co nanoparticles (3–5 nm) of high aspect ratios within the internal space of MWCNTs. The magnetism of the cobalt nanoparticles was probed by 59Co internal field nuclear magnetic resonance (IF NMR) and their electrical behavior by dielectric spectroscopy. 59Co IF NMR provided original information about the structure, size, and shape anisotropy of the nanoparticles. Finally, the MWCNT modification by Co metal nanoparticles improved the electrical conductivity of polyethylene based composite thus extending the useful frequency band of Co/MWCNT/PE composites for applications requiring light-weight conduction or energy absorption.
 
If you want to know more :
Magnetic and dielectric properties of carbon nanotubes with embedded cobalt nanoparticles, Carbon 114 (2017) 39-49.
http://dx.doi.org/10.1016/j.carbon.2016.11.070