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Syntheses and functions of Trimetallic Nanoparticles with a Triple Core/Shell Structure

三核/壳结构三金属纳米粒子的合成及功能

基本信息

批准号：
15310078
负责人：
TOSHIMA Naoki
金额：
$ 8.26万
依托单位：
Tokyo University of Science, Yamaguchi
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

项目摘要

This research aims to create a new type of trimetallic nanoparticles and to establish their fundamentals in order to apply them to new functional materials. In practice, a new type of trimetallic nanoparticles having a triple core/shell structure will be synthesized by using the self-organization of metal nanoparticles, in order to develop new catalysts. In addition, the effect of the third element on the synthesis of new bimetallic alloy nanomagnets will be examined in order to develop a new nanomagnet applicable to super-high-density magnetic memory. The following is the results.1. Physical mixture of two kinds of metal nanoparticles such as Ag and Rh nanoparticles was found to produce bimetallic nanoparticles with a core/shell structure. The reaction mechanism has been proposed based on UV-Vis, TEM and EXAFS measurements.2. Trimetallic nanoparticles having Pd-core/Ag-interlayer/Rh-shell triple core/shell structure have been synthesized by using the physical mixture of Pd-core/Ag-shell bimetallic nanoparticles with Rh nanoparticles (self-organization). These trimetallic nanoparticles have much higher catalytic activity for hydrogenation of olefins than the corresponding monometallic, bimetallic and trimetallic nanoparticles with different structures.3. Addition of the third elements such as Au and Cu to the reaction system to produce SmCo5 nanoparticles can help to create stable SmCo5 nanomagnets. This will be the first report to produce the SuCo5 nanomagnet having enough high coercivity at room temperature.

本研究旨在创造一种新型的三金属纳米颗粒，并建立其基础，以便将其应用于新的功能材料。在实际应用中，利用金属纳米粒子的自组装特性，可以合成具有三核/壳结构的新型三金属纳米粒子，以开发新型催化剂。此外，第三种元素对合成新的铁镍合金纳米磁体的影响将被检查，以开发适用于超高密度磁存储器的新的纳米磁体。以下是结果。两种金属纳米粒子如Ag和Rh纳米粒子的物理混合被发现产生具有核/壳结构的纳米粒子。通过UV-Vis、TEM和EXAFS等测试手段，对反应机理进行了初步探讨.采用Pd核/Ag壳结构的纳米粒子与Rh纳米粒子的物理混合（自组织），合成了具有Pd核/Ag中间层/Rh壳三核/壳结构的三金属纳米粒子。这些三金属纳米粒子对烯烃加氢反应的催化活性远高于相应的单金属、双金属和三金属纳米粒子.向反应体系中添加第三元素如Au和Cu以产生SmCo 5纳米颗粒可以有助于产生稳定的SmCo 5纳米磁体。这将是第一个报告，以生产在室温下具有足够高的矫顽力的SuCo 5纳米磁体。