Encapsulation of Metal (Au, Ag, Pt) Nanoparticles into the Mesoporous SBA-15 Structure
Encapsulation of Metal (Au, Ag, Pt) Nanoparticles into the Mesoporous SBA-15 Structure
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DOI：
10.1021/la0207421
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发表时间：
2003-04
期刊：
影响因子：
3.9
通讯作者：
Ji Zhu;Z. Kónya;V. Puntes;I. Kiricsi;C. Miao;J. Ager;A. P. Alivisatos;G. Somorjai
中科院分区：
文献类型：
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作者：
Ji Zhu;Z. Kónya;V. Puntes;I. Kiricsi;C. Miao;J. Ager;A. P. Alivisatos;G. Somorjai
在2 - 20 nm范围内的金属（Au、Pt和Ag）纳米颗粒存在下合成介孔二氧化硅。通过X射线衍射和电子显微镜进行样品表征。2 - 10 nm范围内的金属纳米颗粒成功地结合到有序的介孔SBA-15结构中;直径大于SBA-15孔径的20 nm颗粒不能插入。在5和10 nm直径的纳米颗粒的情况下，不管是哪种金属，中孔通道膨胀以容纳金属颗粒。通过使用两种不同尺寸的金属纳米颗粒的混合物，发现夹杂物和所得的孔径由较大尺寸的金属颗粒控制。
Mesoporous silica was synthesized in the presence of metal (Au, Pt, and Ag) nanoparticles in the 2−20 nm range. Sample characterization was performed by X-ray diffraction and electron microscopy. The metal nanoparticles in the 2−10 nm range were successfully incorporated into the ordered mesoporous SBA-15 structures; 20 nm particles, whose diameter is larger than the SBA-15 pore size, could not be inserted. In the case of 5 and 10 nm diameter nanoparticles, regardless of which metal, the mesopore channels expanded in order to accommodate the metal particles. By using mixtures of metal nanoparticles of two different sizes, it was found that the inclusion and the resultant pore size were controlled by the larger size metal particles.