Fig. 2 | Nature Communications

Fig. 2

From: Interface-mediated Kirkendall effect and nanoscale void migration in bimetallic nanoparticles during interdiffusion

Fig. 2

Heating-induced changes in the morphology of Pd core–Au shell (Au–Pd) NPs. a In situ STEM images of the same NP after heating at 500 °C for 3 and 20 min, and their corresponding EDX maps. The dashed box highlights a void in the NP. b (Left) Diffusion profiles extracted from the EDX measurements presented in the panel (a) and their respective error-function fits (black curves). (Right) Diffusion coefficients of Pd diffusing in Au obtained from extended studies (Supplementary Fig. 8), where we followed the diffusion of Pd in these NPs as a function of temperature and time. The error bars indicate the standard deviation in the diffusion coefficients obtained at each temperature. An Arrhenius fit (black line) to the averaged diffusion coefficients gives the activation energy of Ea = 1.0 ± 0.6 eV. c In situ TEM image sequence of a NP during heating to 500 and 600 °C

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