首页|Five-parameter grain boundary character distribution of gold nanoparticles based on three dimensional orientation mapping in the TEM
Five-parameter grain boundary character distribution of gold nanoparticles based on three dimensional orientation mapping in the TEM
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NSTL
Elsevier
Three-dimensional orientation mapping in the transmission electron microscope (3D-OMiTEM) has been used to characterize the grain structure of an ion-sputtered gold nanoparticle film. The three-dimensional morphology and crystallographic orientations of ~7500 grains in more than 1200 nanoparticles were reconstructed. It was found that the grains have an average size of 8 nm and a weak crystallographic texture. A five-parameter grain boundary character analysis revealed that the microstructure mainly consists of sigma 3, sigma 9, sigma 11, and sigma 27a boundaries. Differences in the grain boundary plane distributions for these specific misorientations compared to those found for coarse grain-size materials were attributed to extensive grain boundary termination at nano particle surfaces. The grain boundary population is, nevertheless, on average inversely correlated to the grain boundary energy, as reported in previous studies. These findings can serve as a guide for tailoring the grain boundary character distribution and properties of nanoparticles and nanocrystalline thin films.
NSTL
Elsevier
