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The impact of oxygen on the morphology of gas-phase prepared Au nanoparticles
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View: Figures


Image of FIG. 1.
FIG. 1.

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 [110] zone axis orientation. (b) Singly twinned particle in [110] 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)).

Image of FIG. 2.
FIG. 2.

Typical HRTEM images of Au nanoparticles prepared (a) without oxygen and (b) with 5 vol. % oxygen in the sputtering gas (truncated octahedron in [100] zone axis orientation). Insets show the measured size distribution fit with log-normal distribution functions with the mean values and standard deviations , respectively.

Image of FIG. 3.
FIG. 3.

Au nanoparticle morphology distribution as a function of the oxygen content in the sputtering gas. The solid lines are guide to the eyes.

Image of FIG. 4.
FIG. 4.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The impact of oxygen on the morphology of gas-phase prepared Au nanoparticles