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| Characterization of nano-structure materials |
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Atomic diffusion has been recognized as a particularly powerful tool in the synthesis of
heterostructures. However, controlled atomic diffusion is very difficult to achieve in the
fabrication of individual nanostructures. Here, an electrically driven in situ solid-solid diffusion
reaction inside a TEM is reported for the controlled fabrication of two different heteronanostructures in the Ag-Te system. Remarkably, the morphology and structure of the asformed heterostructures are strongly dependent on the path of atomic diffusion. Our
experiments revealed that the surface diffusion of Te atoms to Ag nanowires leads to a coreshell structure, while the bulk diffusion of Ag atoms give rise to a Ag2Te-Te segmented
heterostructure. Heat released by Joule heating caused the surface diffusion process to be
replaced by bulk diffusion and thereby determined the structure of the final product. Our
experimental results provide an insight into solid-state diffusion reactions under an electric field and also propose a new process for the fabrication of complex nanostructures. |
Tailoring atomic diffusion for in situ fabrication of different heterostructures
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Publication: Hui Zhang, Tao Xu, Wen Wang, Longbing He, Litao Sun. Tailoring atomic diffusion for in situ fabrication of different heterostructures[J]. Nature Communications, 2021,12(1):4812.
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