Co_3O_4/介孔SiO_2复合体的制备及其介观结构的调控

Synthesis of Co_3O_4/meso-SiO_2 composite and its mesoscopic structure adjusting

以合成的螯合型表面活性剂N-月桂酰基乙二胺三乙酸(LED3A)为模板剂,利用其与Co2+的配位作用,一步法制备了Co3O4/介孔SiO2复合体。借助紫外光谱验证了LED3A与Co2+间的配位作用,热重分析仪测定样品合适的煅烧温度,通过傅里叶变换红外光谱、X射线衍射、高分辨透射电子显微镜以及N2吸附-脱附等方法对制备的Co3O4/介孔SiO2复合体进行了组分分析和结构表征。发现所形成的Co3O4纳米颗粒分布于SiO2孔道中,并可通过调节Co2+的加入量来控制LED3A极性头电负性,分别得到Pm3n立方相、p6mm二维六方相和Ia3d立方相等不同的介观结构。

Co3 O4/meso-SiO2 composites were synthesized in one-step by using the chelating surfactant N-lauroyl ethylenediamine triacetic acid (LED3A)as templated which coordinated with Co2+.The coordination effect be-tween Co2+ and LED3A was verified by UV spectroscopy (UV).The suitable calcination temperature of sam-ples were analyzed by thermo-gravimetric (TG).The compositions and structures of Co3 O4/meso-SiO2 com-posites were characterized by Fourier transform infrared spectroscopy (FT-IR),thermo-gravimetric (TG),X-ray diffraction (XRD),N2-adsorption-deorption and high resolution transmission electron microscopy (HR-TEM).The results showed that nano-Co3 O4 was formed in the silica pores.Besides,the composites with dif-ferent mesoscopic structures,such as the cubic Pm3n,the two-dimensional hexagonal p6mm,the cubic Ia3d and so on,were formed through adj usting the amounts of Co2+ which affected the polar head electronegativity of LED3 A.