Surface stress of gold nanoparticles revisited

David Holec, Lukas Löfler, Gerald Zickler, Dieter Vollath, Franz-Dieter Fischer

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The surface energy has been one of the topics of atomistic research for nanoparticles in the last decades. However, the physical role of surface stress and its quantification have been a lot less an object of research. Assumptions for the surface stress, going back to the thermodynamic basis of continua, have been popular. As an example the surface stress (state) follows as derivatives of the surface energy with a rather “classical” evolution equation for the deformation energy. The current concept introduces a combination of atomistic modelling and continuum mechanics for a core–shell system. Considering crystalline and amorphous gold nanoparticles with radii in the range of 1 nm to 12 nm, we are finally able to independently calculate the values of surface stress and surface energy, both slightly decreasing with the increasing particle radius. Surprisingly large values of surface stress are predicted for the case of amorphous nanoparticles.

Original languageEnglish
Article number111044
Pages (from-to)1-13
Number of pages13
JournalInternational journal of solids and structures
Issue number1 August
Publication statusPublished - 1 Aug 2021

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