tailieunhanh - Báo cáo hóa học: " Synthesis and Magnetic Characterization of Metal-filled Double-sided Porous Silicon Samples "

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: Synthesis and Magnetic Characterization of Metal-filled Double-sided Porous Silicon Samples | Nanoscale Res Lett 2010 5 379-382 DOI S11671-009-9492-6 NANO EXPRESS Synthesis and Magnetic Characterization of Metal-filled Double-sided Porous Silicon Samples K. Rumpf P. Granitzer P. Poelt Received 22 September 2009 Accepted 2 November 2009 Published online 15 November 2009 to the authors 2009 Abstract A magnetic semiconductor metal nanocomposite with a nanostructured silicon wafer as base material and incorporated metallic nanostructures Ni Co NiCo is fabricated in two electrochemical steps. First the silicon template is anodized in an HF-electrolyte to obtain a porous structure with oriented pores grown perpendicular to the surface. This etching procedure is carried out either in forming a sample with a single porous layer on one side or in producing a double-sided specimen with a porous layer on each side. Second this matrix is used for deposition of transition metals as Ni Co or an alloy of these. The achieved hybrid material with incorporated Ni- and Conanostructures within one sample is investigated magnetically. The obtained results are compared with the ones gained from samples containing a single metal. Keywords Nanocomposite material Ferromagnetic nanostructures Paramagnetic behaviour Introduction Ferromagnetic nanostructures are an important part in basic research but also in nanotechnological applications like magneto-optical devices high density data storage and also in biomedicine such structures at the nanoscale are promising candidates for example in drug delivery K. Rumpf El P. Granitzer Institute of Physics Karl Franzens University Universitaetsplatz 5 8010 Graz Austria e-mail P. Poelt Institute for Electron Microscopy University of Technology Steyrergasse 17 8010 Graz Austria imaging or targeting of special cells. Large area fabrication of periodically arranged nanostructures by self-organization has been carried out in using anodized porous alumina as template for depositing ferromagnetic nanowire arrays 1 .