Lotito Valeria, Zambelli Tomaso
Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, 8092 Zurich, Switzerland.
Adv Colloid Interface Sci. 2022 Jun;304:102642. doi: 10.1016/j.cis.2022.102642. Epub 2022 Mar 11.
Ion beam irradiation of spherical colloidal particles is a viable route to induce particle deformation, especially to get anisotropic shapes. Even though less common in comparison with dry etching techniques, different types of morphological changes can be attained depending on the process parameters (angle of incidence, energy, fluence of the ion beam, type of ion, temperature) and on particle material and initial particle arrangement (crystalline or disordered, made up of isolated or closely-packed particles). The technique can be harnessed to get anisotropic deformation of spherical colloidal particles into an ellipsoidal shape, but also to tailor the interstices between closely-packed colloidal particles, to get particle necking and coalescence as well as particle rearrangement. As such, particle deformation based on ion irradiation can find diverse applications from synthesis of ellipsoidal particles to modified templates for colloidal lithography. In this review, we examine in detail the principles and models of colloidal particle shaping via ion beam irradiation, the influence of process parameters on particle morphology and the applications of irradiated particles.
对球形胶体颗粒进行离子束辐照是诱导颗粒变形的一种可行方法，尤其是获得各向异性形状。尽管与干法蚀刻技术相比不太常见，但根据工艺参数（入射角、能量、离子束通量、离子类型、温度）以及颗粒材料和初始颗粒排列（晶体或无序、由孤立或紧密堆积的颗粒组成），可以实现不同类型的形态变化。该技术可用于使球形胶体颗粒发生各向异性变形成为椭球形，还可用于调整紧密堆积的胶体颗粒之间的间隙，实现颗粒颈缩和聚结以及颗粒重排。因此，基于离子辐照的颗粒变形在从椭球形颗粒合成到胶体光刻的改性模板等方面有多种应用。在本综述中，我们详细研究了通过离子束辐照进行胶体颗粒成型的原理和模型、工艺参数对颗粒形态的影响以及辐照颗粒的应用。
