Protected nanoparticles

Magnetic encapsulates are actively explored in various branches of high-tech industry. Their applications include magnetic data storage, magnetic carriers for biomedicine, hyperthermia treatment, magnetic resonance imaging, catalysis, ferrofluids, etc. Carbon-protected metal nanoparticles have received considerable attention because of their high chemical and thermal stabilities. In the particular case of biomedical applications the metallic core has to be protected from the biological environment. Carbon is one of the best solutions for encapsulation because of its biocompatibility and chemical stability. The synthesis techniques for the synthesis of various carbon-protected metal nanoparticles are under investigations in the CVD group of the IFF.

High-pressure CVD reactor developed in IFW-Dresden

(Pressure: 1…40 bar; Temperature up to 1100 ^oC)

TEM images and size distribution of Fe@C, Co@C, and Ni@C nanoparticles

Comparison of magnetic parameters at T=300K for Fe@C synthesized by different methods

Publications:

1. A.A. El-Gendy, E.M.M. Ibrahim, V.O. Khavrus, Y. Krupskaya, S. Hampel, A. Leonhardt, B. Buechner, R. Klingeler The synthesis of carbon coated Fe, Co and Ni nanoparticles and an examination of their magnetic properties, Carbon 47 (2009) Nr. 12, P. 2821–2828 URL
2. V. O. Khavrus, E. M. M. Ibrahim, A. Leonhardt, S. Hampel, S. Oswald, Ch. Taeschner, Bernd Buechner Conditions of Simultaneous Growth and Separation of Single- and Multiwalled Carbon Nanotubes, J. Phys. Chem. C 114 (2010) Nr. 2, P. 843–848 URL
3. E.M.M. Ibrahim, Vyacheslav O. Khavrus, Albrecht Leonhardt, Silke Hampel, Steffen Oswald, Mark H. Rümmeli, Bernd Büchner Synthesis, characterization, and electrical properties of nitrogen-doped single-walled carbon nanotubes with different nitrogen content, Diamond & Related Materials 19 (2010) Nr. 10, P. 1199–1206 URL

Contacts:

Dr. Albrecht Leonhardt
Department '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

See also:

Initial page of department CVD