Synthesis and Characterization of Bimetallic Pd-Co Nano Magnetic Materials in Mesoporous Silica

摘要

An one-pot procedure was developed for the synthesis of mesoporous silica containing bimetallic PdCo using Pd(NO_3)_2 and CoCl_2, and cetyl trimethyl ammonium bromide (CTAB) as the templating agent, and tetramethoxy silane (TMOS) as the precursor. The materials were characterized using high resolution scanning transmission electron microscopy (HRSTEM), elemental analysis, X-ray diffraction (XRD), and magnetic measurements. The data indicate that the bimetallic Pd-Co nanoparticles are uniformly distributed on the inner pore walls of silica. The magnetic measurements of reduced Pd-Co nanoparticles (4-5nm) in mesoporous silica reveal a typical ferromagnetic behavior up to 20K and exhibit superparamagnetic properties above 30K.