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Synthesis and Magnetic Properties of Cobalt Oxide Nanowires Array With Columnar SBA-15

By: Jin, X.H.; Ge, H.L.; Jin, D.F.; Hong, B.; Wang, X.Q.; Xu, J.C.; Huang, B.; Chen, M.; Peng, X.L.;

2011 / IEEE

Description

This item was taken from the IEEE Periodical ' Synthesis and Magnetic Properties of Cobalt Oxide Nanowires Array With Columnar SBA-15 ' Using hexagonal ordered straight-pore SBA-15 silica as hard template, mesoporous cobalt oxide (Co3O4) nanowires SBA-15 materials are synthesized by a nanoreplication route, and X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), field-emission scanning electron microscopy (FESEM), and N2 physisorption isotherms are used to characterize the microstructure of columnar SBA-15 particles, Co3O4-doped SBA-15 (Co3O4/SBA-15) and Co3O4 nanowires array. The results indicate that Co3O4 exist in the mesochannels of SBA-15 to form Co3O4/SBA-15 nanocomposites and Co3O4 nanowires present mesostructure. Furthermore, the magnetic properties of Co3O4 nanowires array are measured and discussed by vibrating sample magnetometer (VSM) and surperconducting quantum interference device (SQUID), and the prepared Co3O4 nanowires array present superparamagnetism. Owing to surface effect of the uncompensated spins at the surface of Co3O4 nanowires, it presents a weak ferromagnetic behavior at low temperature.