Sonochemical immobilization of noble metal nanoparticles on the surface of maghemite: Mechanism and morphological control of the products

被引：23

作者：

Mizukoshi, Yoshiteru ^{[1
]}

Tsuru, Yasuhiro ^{[2
]}

Tominaga, Aki ^{[3
]}

Seino, Satoshi ^{[4
]}

Masahashi, Naoya ^{[1
]}

Tanabe, Shuji ^{[3
]}

Yamamoto, Takao A. ^{[4
]}

机构：

[1] Tohoku Univ, Osaka Ctr Ind Mat Res, Inst Mat Res, Naka Ku, Osaka 5998531, Japan

[2] Nagasaki Univ, Fac Engn, Nagasaki 8528521, Japan

[3] Nagasaki Univ, Grad Sch Sci & Technol, Nagasaki 8528521, Japan

[4] Osaka Univ, Grad Sch Engn, Suita, Osaka 5650871, Japan

来源：

ULTRASONICS SONOCHEMISTRY | 2008年 / 15卷 / 05期

关键词：

nanocomposite; sonochemical reduction; noble metal; magnetic substance;

D O I：

10.1016/j.ultsonch.2007.12.007

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

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.

引用

页码：875 / 880

页数：6

共 17 条

[1] ULTRAVIOLET VISIBLE ABSORPTION-SPECTRA OF THE COLLOIDAL METALLIC ELEMENTS [J].