Ferromagnetic filled CNTs
Synthesis, characterization, application
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
 |  |  |
| 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
 |  |
| TEM image: CNT filled CuI | TEM image: CNT filled with a therapeutic agent (Carbo-Platinum) |
nanomanipulation and nanomagnetism (sensors for MFM)
 |  |
| 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