Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States.
Langmuir. 2012 Mar 6;28(9):4051-9. doi: 10.1021/la203982h. Epub 2012 Feb 27.
Hollow metallic nanoparticles have been attracting the attention of many researchers in the past five years due to their new properties and potential applications. The unique structure of the hollow nanoparticles; presence of two surfaces (internal and external), and the presence of both cavities and pores in the wall surfaces of these nanoparticles are responsible for their unique properties and applications. Here the galvanic replacement technique is used to prepare nanocages made of gold, platinum, and palladium. In addition, hollow double shell nanoparticles are made of two metal shells like Au-Pt, Pt-Au, Au-Pd, Pd-Au, Pd-Pt, and Pt-Pd. Silver nanocubes are used as templates during the synthesis of hollow nanoparticles with single metal shell or double shell nanocages. Most of the problems that could affect the synthesis of solid Silver nanocubes used as template as well as the double shell nanocages and their possible solutions are discussed in a detail. The sizes and shapes of the single-shell and double-shell nanocages were characterized by a regular and high-resolution TEM. A SEM mapping technique is also used to image the surface atoms for the double shell hollow nanoparticles in order to determine the thickness of the two metal shells. In addition, optical studies are used to monitor the effect of the dielectric properties of the other metals on the plasmonic properties of the gold nanoshell in these mixed nanoparticles.
在过去的五年中，由于具有新颖的性质和潜在的应用，空心金属纳米粒子引起了许多研究人员的关注。空心纳米粒子的独特结构；存在两个表面（内部和外部），以及这些纳米粒子壁表面上同时存在空腔和孔，是其具有独特性质和应用的原因。本文使用电替换技术制备了金、铂和钯纳米笼。此外，还制备了由 Au-Pt、Pt-Au、Au-Pd、Pd-Au、Pd-Pt 和 Pt-Pd 两种金属壳组成的空心双壳纳米粒子。在合成具有单金属壳或双壳纳米笼的空心纳米粒子的过程中，使用银纳米立方体作为模板。详细讨论了可能影响用作模板的实心银纳米立方体以及双壳纳米笼及其可能的解决方案的合成的大多数问题。单壳和双壳纳米笼的尺寸和形状通过规则和高分辨率 TEM 进行了表征。还使用 SEM 映射技术对双壳空心纳米粒子的表面原子进行成像，以确定两个金属壳的厚度。此外，光学研究用于监测其他金属的介电特性对这些混合纳米粒子中金纳米壳的等离子体特性的影响。
