Fig. 2.
Transmission electron micrographs (TEMs) of representative Pt/Ni nanoparticles synthesized under (a) 1, (b) 3, and (c) 6 cycles of microwave irradiation (1 cycle = 50 s on and 30 s off). Molecular models (truncated octahedrons) representing the nanoparticles, electron diffraction patterns obtained from Fourier transform (FFT), and histograms of nanoparticle diameters are shown underneath the TEMs. In the molecular models, Pt and Ni are colored in gold and red, respectively. In the FFT images, most of diffraction spots are generated by the {111} and {002} reflections of Pt or Pt/Ni lattices with the exception that the two spots marked by the arrows in c are the {111} reflection of Ni. Scale bars: TEM, 2 nm; FFT, 2 nm−1. (For interpretation of the color information in this figure legend, the reader is referred to the web version of the article.)