Monodisperse α-Fe2O3@SiO2@Au core/shell nanocomposite spheres: synthesis, characterization and properties

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作者：

Chun-Liu，Fang，Kun，Qian，Jianhua，Zhu，Shangbin，Wang，Xiaoxuan，Lv

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摘要：

A new hybrid spherical structure α-Fe2O3@SiO2@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-Fe2O3@SiO2 spheres were first prepared by a sol–gel process based on the modified St?ber method. Subsequently, the surface of the α-Fe2O3@SiO2 particles was functionalized by–NH2 functional groups. The electrostatic attraction of –NH2 groups will attach the negatively charged Au nanoparticles to the amino-functionalized α-Fe2O3@SiO2 nanospheres in order to prepare α-Fe2O3@SiO2 monodisperse hybrid spheres. The M(H) hysteresis loop for α-Fe2O3@SiO2 and α-Fe2O3@SiO2@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 CO2 have also been studied.

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关键词：

MAGNETIC-PROPERTIES ALPHA-FE2O3 NANOPARTICLES SILICA SPHERES GOLD NANORODS CORE-SHELL NANOCRYSTALS SURFACE ADSORPTION PARTICLES CATALYSTS