Carbon nanotube (CNT)/metal-cluster-based composites are envisioned as new materials that possess unique electronic properties which may be utilized in a variety of future applications. Superparamagnetic behavior was reported for CNTs with Gd ions introduced into the CNT openings by internal loading with an aqueous GdCl3 chemical process. In the current work, the magnetic properties of the CNT/Gd composites were obtained by the joining and annealing of Gd metal and CNTs at 850 °C for 48 h. Energy dispersive X-ray analysis shows the presence of Gd intermingled with the CNT walls with maximum and average Gd concentrations of about 20% and 4% (by weight), respectively. The Gd clusters have a non-uniform distribution and are mostly concentrated at the ends of the CNTs. A ferromagnetic-type transition at TC ∼ 320 K, accompanied by jump like change in magnetization and temperature hysteresis typical for the temperature induced first order phase transitions has been observed by magnetization measurements. It was...
[1]
Marcel Warntjes,et al.
Gd2O3 nanoparticles in hematopoietic cells for MRI contrast enhancement
,
2011,
International journal of nanomedicine.
[2]
Kajsa Uvdal,et al.
Synthesis and characterization of PEGylated Gd2O3 nanoparticles for MRI contrast enhancement.
,
2010,
Langmuir : the ACS journal of surfaces and colloids.
[3]
P. Ajayan,et al.
Air-assisted growth of ultra-long carbon nanotube bundles
,
2008,
Nanotechnology.
[4]
Jean-Christophe Charlier,et al.
Electronic and transport properties of nanotubes
,
2007
.
[5]
S. Ludtke,et al.
Superparamagnetic gadonanotubes are high-performance MRI contrast agents.
,
2005,
Chemical communications.