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Ferromagnetic filled CNTs

Synthesis, characterization, application




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Metal-filled carbon nanotubes are fascinating new materials with many applications. The carbon shells around the iron nanowires provide wear resistance and oxidation protection.

Large arrays of aligned CNTs with ferromagnetic nanowires may have significant potential in data storage media. Individual filled nanotubes may be used as nanocontainer or as sensors and tips for scanning force microscopy.
In our group we synthesize metal-filled carbon nanotubes by CVD technology on various substrates (e.g. precoated silicon or alumina). Also wet chemical routes has been succesful established to fill CNTs afterwards.
The samples were investigated by using electron microscopy (SEM, TEM), focus ion beam technology (FIB), x-ray analysis, thermogravimetric measurements, surface analysis with BET, Mössbauer spectroscopy and atomic force microscopy (AFM). The magnetic properties were determined by alternating gradient magnetometry measurements (AGM), SQUID, electron holography and magnetic force microscopy (MFM).


Activities:

  • controlled growth of ensembles and individuals of filled carbon nanotubes (Fe, Co, Ni, alloys) on substrates, growth mechanism studies


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 individual Ni-filled CNT on alumina
 aligned Fe-filled CNTs
 single-crystalline bcc-Fe nanowire inside


  • filling and chemical functionalization of nanotubes by wet chemistry


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TEM image: CNT filled CuI
TEM image: CNT filled with a therapeutic agent (Carbo-Platinum)


  • nanomanipulation and nanomagnetism (sensors for MFM)


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attaching a filled CNT on a cantilever tip
Fe-nanowire: switch in the magnetization by applying an external magnetic field 

For more information don't hesitate to contact.

Contact:

Dr. Albrecht Leonhardt
'Chemical Vapor Deposition'
Institute for Solid State Research (IFF)
IFW Dresden
D-01171 Dresden, Germany

Phone: +49-351-4659-299
Fax: +49-351-4659-440

Email: a.leonhardt@ifw-dresden.de