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Star-shaped cyclic-twinning nanowires
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) The morphology of the nanowires as revealed by SEM and TEM. (a) A SEM image of the surface of the as-sintered powder with star-shaped nanowires characterized by a sharp line contrast along the wire axis and a star-shaped cross sections (arrowed). (b) An enlarged view of the cross section of one star-shaped nanowire. The dashed line is drawn for highlighting purpose. (c) A TEM image of a star-shaped nanowire. Its diffraction pattern from the selected area (marked by the circle) of the wire is shown in the inset.

Image of FIG. 2.
FIG. 2.

(Color online) The structure model of the star-shaped nanowires. (a) The rhombohedral unit cell of . The dihedral angle between and planes is 71.8° for the observed stoichiometry. “Ic” stands for the center of icosahedron. (b) A cyclic twinning nanowire structure model based on twin planes (where one segment was deliberately taken out for the illustration purpose). (c) The corresponding structural model of the cross section of the star-shaped nanowire. It highlights the atomic nature of the terminating surfaces and the twinning planes involved.

Image of FIG. 3.
FIG. 3.

(Color online) The diffraction analysis of the nanowire. (a) and (d) are the tilt series of the bright field TEM image of the nanowires at 18° and 0°, respectively. The insets in the first column show the projected image in the corresponding orientations. For each image in the first column, the diagram in the second column shows the corresponding electron diffraction pattern, the lines, squares, and circles are added to distinguish different sets of the diffraction pattern present. For comparison, computer simulations of the corresponding diffraction pattern are shown in the third column, together with the labels for the crystalline segments responsible.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Star-shaped cyclic-twinning nanowires