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HRTEM images of the major particle morphologies found for Au nanoparticles and their corresponding calculated diffractograms (basic reflections are labeled with blue and yellow circles) obtained from Fourier-transformations of the original images (below): (a) Truncated octahedron in  zone axis orientation. (b) Singly twinned particle in  zone axis orientation. (c) Decahedron along its 5-fold symmetry axis. (d) Icosahedron as seen along one of its 2-fold symmetry axes. (e) Polycrystalline particle (please note the different scaling in Fig. 1(e)).
Typical HRTEM images of Au nanoparticles prepared (a) without oxygen and (b) with 5 vol. % oxygen in the sputtering gas (truncated octahedron in  zone axis orientation). Insets show the measured size distribution fit with log-normal distribution functions with the mean values and standard deviations , respectively.
Au nanoparticle morphology distribution as a function of the oxygen content in the sputtering gas. The solid lines are guide to the eyes.
Defects in Au icosahedra. (a) HRTEM image of an icosahedron seen along one of its 2-fold symmetry axes with marked twinning planes. The angle between the two twinning planes is due to an edge dislocation. (b) 3D model for the description of a perfect icosahedron in the same orientation as the experimental particle in (a). (c) Simulated HRTEM image from the model in (b) with marked twinning planes. No misalignment of the pair of opposite twinning planes is visible for the perfect icosahedron.
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