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Representative TEM image of single Au nanoparticles (a) and their electron diffraction pattern (b). The diffraction spots of Rings 1, 2, 3 and 4 are due to the (111), (200), (220) and (311) reflections of the lattice planes of the facing center cube. The white arrow in (b) indicates that the d-spacing of the adjacent lattice of the GNPs was 2.3 Å.
