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An “edge to edge” jigsaw-puzzle two-dimensional vapor-phase transport growth of high-quality large-area wurtzite-type ZnO (0001) nanohexagons
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Image of FIG. 1.
FIG. 1.

(a)-(c) Typical SEM images of transparent micron-sized ZnO nanohexagons at different magnifications. (d) Corresponding histograms showing the areas distribution of the ZnO nanohexagons. The SEM image is sized as 912 × 627 pixels. The distribution curve (red line) of areas ((S =  a 2), where a represents the side length of hexagon) was fit using a pure Lorentzian function. The areas' statistics is made with 93 disks.

Image of FIG. 2.
FIG. 2.

(a)-(e) More SEM images of ZnO nanohexagons (someones quasi-freestanding) exhibit with high aspect ratio at different magnifications.

Image of FIG. 3.
FIG. 3.

(a) Low-magnification TEM (JEM-2010HR) image, and (b) High-resolution TEM (HRTEM) image of an individual ZnO (0001) nanohexagon. Inset, corresponding enlarged simulated HRTEM image with 6-fold rotational symmetry. (c) Its corresponding selected area electron diffraction pattern confirming that the growth of ZnO nanohexagons along the c-axis of the [0001] direction for hexagonal ZnO. (d) A representative EDAX pattern collected from an individual ZnO nanohexagon indicating that the nanopetal is pure ZnO. The tiny Cu peak came from the TEM grid. Note that there were no indium element peaks detected in the visible.

Image of FIG. 4.
FIG. 4.

(a) Digital photograph of an individual ZnO nanohexagon. (b) A typical FLM (Olympus-DP50, BX51) image of the ZnO nanohexagons, excited with UV. Inset in (b) shows the close-up microscope fluorescence image of an individual ZnO nanohexagon. (c) Normalized PL (Edinburgh Instruments FLS920) spectra of stimulated emission between the ZnO nanohexagons grown directly on a Si substrate, and ZnO powders measured at room temperature with an excitation wavelength from a He–Cd laser at 325 nm. The black dashed line arrow guides the eyes. Note that there was no 515 nm-peak detected in the ZnO nanohexagons. (d) PXRD pattern with CuKα radiation obtained from ZnO nanohexagons. The strong peaks indicate that the crystallinity is good. All the peaks can be exactly indexed to the typical hexagonal WZ ZnO phase with lattice constants of a = 0.325 nm and c = 0.521 nm, which is in good agreement with the literature values (JCPDS No. 36-1451).

Image of FIG. 5.
FIG. 5.

(a) A typical SEM image of two adjacent large thin ZnO (0001) nanohexagons self-assembling into a larger one by “edge to edge” aggregation growth. The white dashed lines are drawn to guide the eye. Inset, a jigsaw-puzzle. (b) Schematics illustrating spontaneous organization of lattice unit cells into stable, larger SC ZnO nanohexagons via an “edge to edge” jigsaw-puzzle 2D VPT growth process. (i) Creation of Zn vapor, subsequent transport, and selective oxidation. The dominant in-plane expansion leads to ZnO nanohexagon coalesce on Si substrates in well-defined crystalline orientations along 〈 〉, i.e., the 2D ZnO nanohexagon growth of high aspect ratio. (ii) Fast surface diffusion and Zn absorption of the competitive capturing of the adsorbed the ZnO vapor. Because the {0001} surface of WZ ZnO is of energy lowest and stable, a tiny Zn vapor was preferentially adsorbed and oxidized into ZnO on Zn / ZnO {0001} interfaces, which is the thermodynamically favorable. (iii) Formation of large-area thin WZ SC ZnO (0001) nanohexagons via an “edge to edge” jigsaw-puzzle 2D VPT growth route.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: An “edge to edge” jigsaw-puzzle two-dimensional vapor-phase transport growth of high-quality large-area wurtzite-type ZnO (0001) nanohexagons