Sonochemical immobilization of noble metal nanoparticles on the surface of maghemite: Mechanism and morphological control of the products
Sonochemical immobilization of noble metal nanoparticles on the surface of maghemite: Mechanism and morphological control of the products
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DOI：
10.1016/j.ultsonch.2007.12.007
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发表时间：
2008-07-01
影响因子：
8.4
通讯作者：
Yamamoto, Takao A.
中科院分区：
文献类型：
--
作者：
Mizukoshi, Yoshiteru;Tsuru, Yasuhiro;Yamamoto, Takao A.
用高功率超声辐照含有贵金属离子(HAuCl(4)、Na(2)PdCl(4)、H（2)PtCl(6)）、聚乙二醇单硬脂酸酯和磁性磁赤铁矿纳米粒子的水溶液。对产物的分析表明，超声波作用使贵金属离子减少，形成的贵金属纳米颗粒均匀地固定在磁铁矿表面。与传统的浸渍方法相比，“一锅法”显著简化了贵金属纳米颗粒在支架表面的固定。固定化Au的平均直径为7 ~ 13 nm， Pd和Pt的平均直径为几nm，其直径与单硬脂酸聚乙二醇浓度和贵金属离子浓度有关，而与磁铁矿浓度无关，说明可以通过调整这些制备条件来控制产物的形态。在不同条件下获得的固定金纳米颗粒的平均直径和数量的测量表明，金的成核不发生在磁铁矿表面，而可能发生在均相体溶液中。(C) 2008 Elsevier B.V.版权所有
Aqueous sample solutions containing noble metal ions (HAuCl(4), Na(2)PdCl(4), H(2)PtCl(6)), polyethyleneglycol monostearate, and magnetic maghemite nanoparticles were irradiated with high power ultrasound. Analyses of the products showed that noble metal ions were reduced by the effects of ultrasound, and the formed noble metal nanoparticles were uniformly immobilized on the surface of the maghemite. The present "one pot process" significantly simplifies the immobilization of noble metal nanoparticles on the surface of supports, compared with the conventional impregnation method. The average diameter of immobilized Au was 7-13 nm, and the diameters of Pd and Pt were several nm. The diameters depended upon the concentration of polyethyleneglycol monostearate and the concentration of noble metal ions, but not upon the maghemite concentration, indicating the possibility of the morphological controls of the products by adjusting these preparation conditions. The measurements of the average diameters and the numbers of immobilized Au nanoparticles obtained under various conditions suggest that the nucleation of Au does not occur on the surface of maghemite, but it might occur in the homogeneous bulk solution. (C) 2008 Elsevier B.V. All rights reserved.