Fabrication of nanomaterials

In-situ Characterization

Related simulations
           Characterization of nano-structure materials
      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

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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