SYNTHESIS AND CHARACTERIZATION OF MESOPOROUS, NANORODS, NANOWIRES METAL OXIDES

摘要

Mesoporous high surface area and high crystallinity MO_2 (M = Ti, Ce, Zr, and Hf) and their mixed oxides powders were synthesized by a modified sol-gel method using laurylamine hydrochloride, metal alkoxide and acetylacetone. The prepared powders had a crystalline size of about 5-15 nm, a specific surface area of 44-80 m~2/g, and a narrow pore size distribution with average pore diameter of about 3-6 nm. 1-D nano-structured (nanorods and nanowires) metal oxides were also successfully synthesized by hydrothermal method. Uniformly sized B phase VO_2 nanorods had widths about 40-80 nm and lengths reaching up to 1 μm. V_2O_5 rodlike structured with the widths about 100-500 nm and the length of 1-10 (im were obtained by calcination at 400℃ for 4 h. Tungsten oxides and magnesium oxides nanowires were also synthesized using the same route of vanadium oxides nanorods by changing only alkoxide precursors. These synthesis methods provide simple routes to fabricate nanostructured materials under mild conditions.