tailieunhanh - Báo cáo hóa học: " Investigation of a Mesoporous Silicon Based Ferromagnetic Nanocomposite"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Investigation of a Mesoporous Silicon Based Ferromagnetic Nanocomposite | Nanoscale Res Lett 2010 5 374-378 DOI S11671-009-9491-7 NANO EXPRESS Investigation of a Mesoporous Silicon Based Ferromagnetic Nanocomposite P. Granitzer K. Rumpf A. G. Roca M. P. Morales P. Poelt M. Albu Received 22 September 2009 Accepted 2 November 2009 Published online 15 November 2009 to the authors 2009 Abstract A semiconductor metal nanocomposite is composed of a porosified silicon wafer and embedded ferromagnetic nanostructures. The obtained hybrid system possesses the electronic properties of silicon together with the magnetic properties of the incorporated ferromagnetic metal. On the one hand a transition metal is electrochemically deposited from a metal salt solution into the nanostructured silicon skeleton on the other hand magnetic particles of a few nanometres in size fabricated in solution are incorporated by immersion. The electrochemically deposited nanostructures can be tuned in size shape and their spatial distribution by the process parameters and thus specimens with desired ferromagnetic properties can be fabricated. Using magnetite nanoparticles for infiltration into porous silicon is of interest not only because of the magnetic properties of the composite material due to the possible modification of the ferromagnetic superparamagnetic transition but also because of the biocompatibility of the system caused by the low toxicity of both materials. Thus it is a promising candidate for biomedical applications as drug delivery or biomedical targeting. P. Granitzer El K. Rumpf Institute of Physics Karl Franzens University Graz Universitaetsplatz 5 8010 Graz Austria e-mail A. G. Roca M. P. Morales Instituto de Ciencia de Materiales de Madrid CSIC Sor Juana Ines de la Cruz 3 28049 Cantoblanco Madrid Spain P. Poelt M. Albu Institute for Electron Microscopy University of Technology Graz Steyrergasse 17 8010 Graz Austria Keywords Porous silicon Nanocomposite Magnetic nanoparticles Introduction Nanostructuring of .