Ion beam shaping is a novel technique with which one can shape nano-structures that are embedded in a matrix, while simultaneously imposing their orientation in space. In this work, we demonstrate that the ion-shaping technique can be implemented successfully to engineer the morphology of hollow metallic spherical particles embedded within a silica matrix. The outer diameter of these particles ranges between 20 and 60 nm and their shell thickness between 3 and 14 nm. Samples have been irradiated with 74 MeV Kr ions at room temperature and for increasing fluences up to 3.8 × 1014 cm−2. In parallel, the experimental results have been theoretically simulated by using a three-dimensional code based on the thermal-spike model. These calculations show that the particles undergo a partial melting during the ion impact, and that the amount of molten phase is maximal when the impact is off-center, hitting only one hemisphere of the hollow nano-particle. We suggest a deformation scenario which differs from the one that is generally proposed for solid nano-particles. Finally, these functional materials can be seen as building blocks for the fabrication of nanodevices with really three-dimensional architecture.
展开▼
机译：离子束成形是一种新颖的技术，利用该技术，可以成形嵌入基质中的纳米结构，同时在空间中施加其定向。在这项工作中，我们证明了可以成功实施离子整形技术来工程化嵌入二氧化硅基质中的中空金属球形颗粒的形态。这些颗粒的外径在20至60 nm之间，壳厚度在3至14 nm之间。样品在室温下用74 MeV Kr离子辐照，并且通量提高到3.8×10 14 cm -2 。并行地，通过基于热尖峰模型的三维代码在理论上模拟了实验结果。这些计算表明，粒子在离子撞击过程中发生部分熔化，并且当撞击偏离中心时，熔融相的量最大，仅撞击中空纳米粒子的一个半球。我们提出了一种变形方案，该变形方案与通常针对固体纳米粒子提出的方案不同。最后，这些功能材料可以看作是制造具有真正三维结构的纳米器件的基础。
展开▼
