单分散α-Fe(2)O(3)@SiO(2)@Au核壳纳米复合球体：合成、表征及性能
Monodisperse α-Fe(2)O(3)@SiO(2)@Au core/shell nanocomposite spheres: synthesis, characterization and properties.
作者信息
Fang Chun-Liu, Qian Kun, Zhu Jianhua, Wang Shangbin, Lv Xiaoxuan, Yu Shu-Hong
机构信息
Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, School of Chemistry and Materials, University of Science and Technology of China, Heifei 230026, People's Republic of China.
出版信息
Nanotechnology. 2008 Mar 26;19(12):125601. doi: 10.1088/0957-4484/19/12/125601. Epub 2008 Feb 21.
A new hybrid spherical structure α-Fe(2)O(3)@SiO(2)@Au with a size of about 141 nm was designed, with a hematite cubic core surrounded by a thick silica shell and further decorated with gold nanoparticles. The monodisperse α-Fe(2)O(3)@SiO(2) spheres were first prepared by a sol-gel process based on the modified Stöber method. Subsequently, the surface of the α-Fe(2)O(3)@SiO(2) particles was functionalized by-NH(2) functional groups. The electrostatic attraction of -NH(2) groups will attach the negatively charged Au nanoparticles to the amino-functionalized α-Fe(2)O(3)@SiO(2) nanospheres in order to prepare α-Fe(2)O(3)@SiO(2) monodisperse hybrid spheres. The M(H) hysteresis loop for α-Fe(2)O(3)@SiO(2) and α-Fe(2)O(3)@SiO(2)@Au spheres indicates that the nanocomposite spheres exhibit superparamagnetic characteristics at room temperature. The optical properties and the application of these hybrid nanocomposites as catalysts for the conversion of CO to CO(2) have also been studied.
设计了一种尺寸约为141纳米的新型混合球形结构α-Fe₂O₃@SiO₂@Au，其赤铁矿立方核心被一层厚厚的二氧化硅壳包围，并进一步用金纳米颗粒修饰。首先基于改进的施托伯方法通过溶胶-凝胶法制备了单分散的α-Fe₂O₃@SiO₂球体。随后，α-Fe₂O₃@SiO₂颗粒的表面被-NH₂官能团功能化。-NH₂基团的静电吸引力将带负电荷的金纳米颗粒附着到氨基功能化的α-Fe₂O₃@SiO₂纳米球上，以制备α-Fe₂O₃@SiO₂单分散混合球。α-Fe₂O₃@SiO₂和α-Fe₂O₃@SiO₂@Au球的M(H)磁滞回线表明，纳米复合球在室温下表现出超顺磁特性。还研究了这些混合纳米复合材料的光学性质及其作为将CO转化为CO₂的催化剂的应用。
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