4.4 Article Proceedings Paper

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

Journal

IEEE TRANSACTIONS ON MAGNETICS
Volume 47, Issue 10, Pages 2851-2854

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2011.2147294

Keywords

Antiferromagnetic materials; magnetic properties; mesoporous materials; nanowires

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Using hexagonal ordered straight-pore SBA-15 silica as hard template, mesoporous cobalt oxide (Co(3)O(4)) 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 physisorption isotherms are used to characterize the microstructure of columnar SBA-15 particles, Co(3)O(4)-doped SBA-15 (Co(3)O(4)/SBA-15) and Co(3)O(4) nanowires array. The results indicate that Co(3)O(4) exist in the mesochannels of SBA-15 to form Co(3)O(4)/SBA-15 nanocomposites and Co(3)O(4) nanowires present mesostructure. Furthermore, the magnetic properties of Co(3)O(4) nanowires array are measured and discussed by vibrating sample magnetometer (VSM) and surperconducting quantum interference device (SQUID), and the prepared Co(3)O(4) nanowires array present superparamagnetism. Owing to surface effect of the uncompensated spins at the surface of Co(3)O(4) nanowires, it presents a weak ferromagnetic behavior at low temperature.

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