Periodic inclusion of room-temperature-ferromagnetic metal phosphide nanoparticles in carbon nanotubes.
We demonstrate the use of sequential catalytic growth to encapsulate iron, nickel-iron, and iron-cobalt phosphide catalyst nanoparticles periodically along the entire lengths of carbon nanotubes. Investigations by local electron spectroscopies and electron diffraction reveal the compositions and crystal structures of the encapsulated particles. Significantly, high spatial resolution magnetic characterization using magnetic force microscopy and off-axis electron holography demonstrates that encapsulated iron-cobalt phosphide nanoparticles are ferromagnetic at room temperature, in accordance with the properties of bulk metal phosphides of the same structure and composition.
Jourdain
Vincent
V
LCVN, UMR 5587 CNRS-UM2, Université Montpellier II, France. jourdain@lcvn.univ-montp2.fr
Simpson
Edward T
ET
Paillet
Matthieu
M
Kasama
Takeshi
T
Dunin-Borkowski
Rafal E
RE
Poncharal
Philippe
P
Zahab
Ahmed
A
Loiseau
Annick
A
Robertson
John
J
Bernier
Patrick
P