Abstract
We report a versatile electron beam
(e-beam) synthesis method for the local fabrication
of ferromagnetic nanocrystals ‘‘on demand’’. A local-
ized irradiation in a transmission electron microscope
(TEM) is used to convert a raw cobalt fluoride material
into ferromagnetic metal by means of formation of a
short-range ordered distribution of well-defined fac-
eted three-dimensional (3D) cobalt nanocrystals on
the carbon substrate. A range of sizes and morphol-
ogies can be obtained, depending on the size, intensity,
and acceleration voltage of the e-beam and on the
initial size/thickness of the 3D raw fluoride materials,
with 300 kV acceleration voltage and thermionic
LaB6 emission found most favorable. The nanofabri-
cation of locally quasi-monodispersed, small sized,
and well-distributed 3D nanocrystals opens up the
possibility to generate particle arrays on demand with
desirable magnetic properties.
(e-beam) synthesis method for the local fabrication
of ferromagnetic nanocrystals ‘‘on demand’’. A local-
ized irradiation in a transmission electron microscope
(TEM) is used to convert a raw cobalt fluoride material
into ferromagnetic metal by means of formation of a
short-range ordered distribution of well-defined fac-
eted three-dimensional (3D) cobalt nanocrystals on
the carbon substrate. A range of sizes and morphol-
ogies can be obtained, depending on the size, intensity,
and acceleration voltage of the e-beam and on the
initial size/thickness of the 3D raw fluoride materials,
with 300 kV acceleration voltage and thermionic
LaB6 emission found most favorable. The nanofabri-
cation of locally quasi-monodispersed, small sized,
and well-distributed 3D nanocrystals opens up the
possibility to generate particle arrays on demand with
desirable magnetic properties.
Original language | English |
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Number of pages | 12 |
Journal | Journal of Nanoparticle Research |
Volume | 14 |
Issue number | 683 |
Early online date | 14 Feb 2012 |
DOIs | |
Publication status | Published - Mar 2012 |
Keywords
- Cobalt nanocrystals, Electron beam, In situ synthesis, TEM, Ferromagnetic nanocrystals, Fabrication method