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The inner set of spots in the [111] pattern is believed to originate from the 1/3{422} planes normally forbidden by a face centered cubic (fcc) lattice.According to the results of Kirkland et al.and Germani et al.£¬such 1/3{422} forbidden reflections observed on the platelike structures of silver or gold should be attributed to (111) stacking faults parallel to the (111) surface and extending across the entire nanoprism. Thus, it is reasonable that the top and bottom surfaces of the Au nanoprisms are bound by atomically flat {111} planes.The second set of spots with the strongest intensity is indexed to {220} Bragg reflections, which indicates that the as-prepared nanoprisms are single crystal with {111} lattice planes as the basal surfaces. Also, the sidewalls of the Au nanosheets with hexagonal or triangular shape should be terminated with {110} planes concluded from the angles between the adjacent edge sides and between the{111} basal planes and the sidewalls (see parts D and E of Figure 2). The reaction is prompt enough and thus results in the isotropic growth of Au nuclei, which induces the nearly spherical Au nanoparticles¡£ The basal surfaces of the Au nanodisk are atomically flat {111} planes and the lateral surfaces are {110} planes. ºìÉ«²¿·ÖÐèÒª·Ò룬´ó¼Ò°ï°ïæ°É |
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