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Catalysis by Shape Selected Metallic Nanoparticles: Mechanism of Shape Control and Nanoparticle Stability

形状选择的金属纳米颗粒的催化：形状控制和纳米颗粒稳定性的机制

基本信息

批准号：
9727633
负责人：
Mostafa El-Sayed
金额：
$ 33.6万
依托单位：
Georgia Tech Research Corporation
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1998
资助国家：
美国
起止时间：
1998-03-01 至 2001-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9727633&HistoricalAwards=false
关键词：
Catalysis Shape Selected Metallic Nanoparticles

项目摘要

This project, supported in the Analytical and Surface Chemistry Program, focusses on the characterization of transition metal nanoparticles prepared by a process involving hydrogen reduction and control of particle shape by the presence of capping polymers. Professors El-Sayed and Wang and their students at Georgia Tech will characterize the shape and composition of these nanoparticles using high resolution transmission electron microscopy, parallel- detection electron energy-loss spectroscopy, energy-dispersive X- ray spectroscopy, and Raman and FTIR vibrational spectroscopies. The objective is to establish an understanding of the synthetic parameters that control the shapes of these nanoparticles and their properties. The long-term aim of this work is to develop useful nanoparticle structures for applications in heterogeneous catalysis. A new synthetic process for preparing transition metal nanoparticles that can control their shape has been developed by Professors El-Sayed and Wang at Georgia Tech. This process involves reduction of metal ions using molecular hydrogen in the presence of polymers that cap the particle surface. The factors that are important in controlling the size, shape, and composition of these particles will be determined using an array of surface characterization methods, particularly high resolution transmission electron microscopy. The long-term goal of this work is to develop a family of new low temperature heterogeneous catalysts for industrial use.

该项目得到了分析和表面化学计划的支持，重点是通过氢气还原和通过覆盖聚合物的存在控制颗粒形状的过程来制备过渡金属纳米颗粒的表征。佐治亚理工学院的El-Sayed教授和Wang教授以及他们的学生将使用高分辨率透射电子显微镜、平行探测电子能量损失光谱、能量色散X射线光谱以及拉曼和FTIR振动光谱来表征这些纳米颗粒的形状和组成。其目的是建立对控制这些纳米颗粒的形状和性质的合成参数的理解。这项工作的长期目标是开发用于多相催化的有用的纳米颗粒结构。佐治亚理工学院的El-Sayed和Wang教授开发了一种新的合成工艺，用于制备可以控制其形状的过渡金属纳米颗粒。这一过程包括在覆盖颗粒表面的聚合物存在的情况下使用分子氢还原金属离子。控制这些颗粒的大小、形状和组成的重要因素将使用一系列表面表征方法，特别是高分辨率透射电子显微镜来确定。这项工作的长期目标是开发一系列用于工业的新型低温多相催化剂。