Platinum-catalyzed synthesis of water-soluble gold-platinum nanoparticles.
Platinum-catalyzed synthesis of water-soluble gold-platinum nanoparticles.
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DOI：
10.1021/la047555i
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发表时间：
2005-01
期刊：
影响因子：
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通讯作者：
Peter N. Njoki;Jin Luo;Lingyan Wang;M. Maye;Huzaifa Quaizar;C. Zhong
中科院分区：
文献类型：
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作者：
Peter N. Njoki;Jin Luo;Lingyan Wang;M. Maye;Huzaifa Quaizar;C. Zhong
在纳米颗粒的合成中控制组成和尺寸的能力对于开发纳米催化性能是重要的。本文报道了一种新的方法的研究结果，在水溶液中通过单相还原AuCl（4-）和PtCl（4）（2-），使用还原剂和封端剂的组合，金铂（AuPt）纳米粒子的合成。氢用作还原Pt（II）的还原剂，而丙烯酸酯用作还原Au（III）的还原剂。后一反应被发现是催化的Pt（II）的还原的结果形成的Pt。丙烯酸酯也作为封端剂对所得的纳米晶体。通过控制AuCl（4-）和PtCl（4）（2-）的投料比和丙烯酸酯的相对浓度，证明了制备AuPt纳米颗粒的有效途径，其纳米颗粒的组成范围为约4 ~ 90% Au，粒径范围为2 ~ 8 nm。采用透射电子显微镜、直流等离子体原子发射光谱、傅里叶变换红外光谱和X射线衍射等方法对壳的组成、尺寸和壳的性质进行了表征。对双功能催化剂的探索结果的影响也作了简要讨论。
The ability to control composition and size in the synthesis of bimetallic nanoparticles is important for the exploitation of the bimetallic catalytic properties. This paper reports findings of an investigation of a new approach to the synthesis of gold-platinum (AuPt) bimetallic nanoparticles in aqueous solution via one-phase reduction of AuCl(4-) and PtCl(4)(2-) using a combination of reducing and capping agents. Hydrogen served as a reducing agent for the reduction of Pt(II), whereas acrylate was used as a reducing agent for the reduction of Au(III). The latter reaction was found to be catalyzed by the formation of Pt as a result of the reduction of Pt(II). Acrylate also functioned as capping agent on the resulting nanocrystals. By controlling the feed ratios of AuCl(4-) and PtCl(4)(2-) and the relative concentrations of acrylate, an effective route for the preparation of AuPt nanoparticles with bimetallic compositions ranging from approximately 4 to 90% Au and particle sizes ranging from 2 to 8 nm has been demonstrated. The composition, size, and shell properties were characterized using transmission electron microscopy, direct current plasma-atomic emission spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. Implications of the results to the exploration of bifunctional catalysts are also briefly discussed.