钛铁矿型CoTiO_3纳米材料的制备及性能表征

Synthesis and Characterization of Ilmenite-type CoTiO_3 Nanomaterials

以Co(NO3)2?6H2O和TiO2(P-25)为原料,在十六烷基三甲基溴化铵(CTAB)/水形成的胶束溶液中,首先制得纳米氧化钴Co3O4-TiO2复合材料,该复合材料经600和700℃煅烧后制备了钛铁矿型CoTiO3纳米材料.以X射线衍射(XRD)、透射电子显微镜(TEM)、紫外-可见(UV-vis)、拉曼(Raman)光谱和X射线光电子能谱(XPS)对其结构特征和光谱性能进行了研究.用TEM形貌观察,粒子基本为球形;纳米CoTiO3的UV-vis吸收峰明显红移;经Raman光谱和XPS分析,进一步表明600和700℃煅烧后形成了Ti—O—Co键.

The nanostructural composite materials of titanium dioxide TiO2 and cobalt oxide Co3O4 were prepared using cobalt nitrate hexahydrate Co（NO3）2·6H2O and titanium dioxide （TiO2, P-25） as precursors in cetyltrimethylammonium bromide （CTAB）/H2O micelle solution. The ilmenite-type CoTiO3 nanomaterials could be obtained when the composite powders were calcinated at 600 and 700 ℃. The nanostructure composition and spectroscopic characterization of these nanomaterials at different calcination temperatures were characterized by X-ray powder diffraction （XRD）, transmission electron microscopy （TEM）, X-ray photoelectron spectroscopy （XPS）, UV-vis spectroscopy and Raman spectroscopy. TEM image showed that the nanoparticles were almost spherical. The UV-vis spectra showed that nanosized CoTiO3 displayed significant red shift in the absorption band. The formation of bond Ti-O-Co at 600 and 700 ℃ calcination temperatures was also confirmed by the XPS and Raman spectra.