Authors: C. Altavilla, C. Leone, D. Sannino, M. Sarno, P. Ciambelli
Affilation: university of salerno, Italy
Pages: 143 - 146
Keywords: nanoparticles, application, carbon nanotubes
The possibility of preparing monodispersed transition metal-oxides nanoparticles covered by functionalized long chain organic molecules, in the sub size range of 20 nm, has recently open an entire field of research. In fact, inorganic core at the nanoscale provides unusual properties with respect to the corresponding bulk counterpart. Moreover, functionalization of the organic coating with different groups makes these systems building blocks for novel nanostructured materials. Today, ferrite nanoparticles find significant applications in high frequency devices, memories, heat transfer devices, drug delivery systems, medical diagnostics, cancer therapy, catalysis. We have synthesized different classes of monodispersed MFe2O4 (M=Fe, Co, Ni) nanoparticles by decomposition of metal-organic precursors in organic solvent and explored the reaction temperature effect on the nanoparticles average dimension. We obtained particle sizes in the range of 2-6 nm at different reaction temperature. Moreover, we succeeded in modifying the organic coating with different long chain organic molecules opportunely functionalized for specific application by simple organic exchange reactions or by using different stabilizer agents directly during the synthesis. We have tested some of these nanoparticles as patterned catalyst for CVD synthesis of carbon nanotubes on silicon wafer.