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(a) XRD pattern of the chestnut-like Au nanocrystals. The line spectrum is the standard pattern of Au powders. (b) TEM image of an individual chestnut-like Au nanocrystal. (c) Selected area electron diffraction (SAED) pattern of the particle in (b). (d) HRTEM image of the nanoneedle marked with an arrow in (b). The arrows in (b,d) are parallel.
