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Publication Detail
Atomic Diffusion within Individual Gold Nanocrystal
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Xiong G, Clark J, Nicklin C, Rawle J, Robinson IK
  • Publisher:
    Nature Publishing Group
  • Publication date:
    2014
  • Journal:
    Scientific Reports
  • Status:
    Accepted
Abstract
Due to their excess surface free energy and structural instabilities, nanoparticles exhibit interesting physical and chemical properties. There has been an ever-growing interest in investigating these properties, driven by the desire to further miniaturize electronic devices, develop new functional materials and catalysts. Here, the intriguing question of how diffusion evolves in a single nanoparticle is investigated by measuring the spatial and temporal variations of the diffracted coherent X-ray intensity during copper diffusion into a gold nanocrystal. Dislocation loops formed from the insertion of single layer of extra atoms between neighbouring gold host lattice planes are detected. Au-Cu alloy channels are found to penetrate the nanocrystal due to the differential diffusion rate along different directions. With the advent of higher brilliance sources and free-electron-lasers, Bragg Coherent X-ray Diffraction Imaging can play an important role in unveiling atomic behaviours in three dimensions for nanomaterials during various fundamental processes.
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