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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Multifunctional nanocomposites constructed from Fe_3O _4~-Au nanoparticle cores and a porous silica shell in the solution phase
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Multifunctional nanocomposites constructed from Fe_3O _4~-Au nanoparticle cores and a porous silica shell in the solution phase

机译：由Fe_3O _4〜-Au纳米粒子核和多孔二氧化硅壳在溶液相中构建的多功能纳米复合材料

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摘要

This work is directed towards the synthesis of multifunctional nanoparticles composed of Fe_3O_4~-Au nanocomposite cores and a porous silica shell (Fe_3O_4~-Au/pSiO_2), aimed at ensuring the stability, magnetic, and optical properties of magnetic-gold nanocomposite simultaneously. The prepared Fe_3O_4~-Au/ pSiO_2 core/shell nanoparticles are characterized by means of TEM, N_2 adsorption-desorption isotherms, FTIR, XRD, UV-vis, and VSM. Meanwhile, as an example of the applications, catalytic activity of the porous silica shell-encapsulated Fe_3O_4~-Au nanoparticles is investigated by choosing a model reaction, reduction of o-nitroaniline to benzenediamine by NaBH4. Due to the existence of porous silica shells, the reaction with Fe_3O_4~-Au/pSiO_2 core/shell nanoparticles as a catalyst follows second-order kinetics with the rate constant (k) of about 0.0165 l mol~(-1) s~(-1), remarkably different from the first-order kinetics with the k of about 0.002 s~(-1) for the reduction reaction with the core Fe_3O_4~-Au nanoparticles as a catalyst.
机译：这项工作旨在合成由Fe_3O_4〜-Au纳米复合材料核和多孔二氧化硅壳（Fe_3O_4〜-Au / pSiO_2）组成的多功能纳米粒子，旨在同时确保磁性金纳米复合材料的稳定性，磁性和光学性质。通过TEM，N_2吸附-脱附等温线，FTIR，XRD，UV-vis和VSM对制备的Fe_3O_4〜-Au / pSiO_2核/壳纳米粒子进行表征。同时，作为应用实例，通过选择模型反应，即NaBH4将邻硝基苯胺还原为苯二胺，研究了多孔二氧化硅壳包裹Fe_3O_4〜-Au纳米颗粒的催化活性。由于存在多孔二氧化硅壳，以Fe_3O_4〜-Au / pSiO_2核/壳纳米粒子为催化剂的反应遵循二级动力学，速率常数（k）约为0.0165 l mol〜（-1）s〜（ -1），与一阶动力学显着不同，以核心Fe_3O_4〜-Au纳米粒子为催化剂进行还原反应时，k约为0.002 s〜（-1）。

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