期刊
APPLIED SURFACE SCIENCE
卷 538, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148133
关键词
Thin films; Amorphous metal alloys; Nanocrystalline alloys; Phase separation; Growth kinetics; Surface functionalization
类别
资金
- The Universite franco-allemande (UFA) within the PhD-track in Materials Science and Engineering at UFA
- Ministere de l'Enseignement Superieur et de la Recherche within the PhD-track in Materials Science and Engineering at UFA
The composition-driven transition from the amorphous to the crystalline state in thin films offers a new avenue for the fabrication of hybrid crystalline-amorphous architectures. The peculiar morphology of these nano(micro)structured films provides a simple bottom-up route for obtaining adjustable multifunctional surfaces. The growth kinetics of the formed two-phase nanostructures is demonstrated equivalent to a 2-dimensional amorphous-to-crystalline phase transformation, showcasing the feasibility of this approach for controlling surface morphology and related functional properties in thin films.
Composition-driven transition to the crystalline state is characteristic of amorphous metal alloys and is widely observed in thin film. However, the transition zone (compositional range between single-phase amorphous and crystalline films) remains unexplored. Here, we demonstrate that this transition offers an excellent scenario for the fabrication of hybrid crystalline-amorphous architectures. The peculiar morphology of these nano(micro)structured films provides a simple bottom-up route, applicable to a broad range of alloys, for obtaining adjustable multifunctional surfaces. In particular, we prove the feasibility of this approach as a one-step process for a precise control of specular and diffuse reflectance over the visible spectrum. Further, the growth kinetics of the formed two-phase nanostructures is demonstrated equivalent to a 2-dimensional amorphous-to-crystalline phase transformation. Using Zr-W alloys as a model system, fundamental parameters of the growth process and the corresponding metastable thickness-composition phase diagram are extracted. It evidences that the two-phase nanostructures, despite occurring in a wide range of compositions, can be easily hidden experimentally by growth kinetics and nucleation delay. These results open a new avenue on the surface morphology and related functional properties control in thin films.
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