Fig. 4

Characterizations of Au@Ag twinned nanokites. a Transmission electron microscopy (TEM) image of an acute-angled Au@Ag nanokite. b High-magnification TEM image and corresponding fast Fourier transform (FFT) pattern (inset) of the acute-angled Au@Ag nanokite. (0 0 0 4), (1 0 \(\bar 1\) 0), and (1 0 \(\bar 1\) 2) spots of 4H phase are marked with pentagons, circles, and squares, respectively. The orange and blue represent different 4H sub-crystals. c HRTEM image of the twin boundary of the acute-angled Au@Ag twinned nanokite. The twin boundary is marked in turquoise line. d Scanning transmission electron microscopy (STEM) and e, f STEM-energy-dispersive X-ray spectroscopy (STEM-EDX) elemental mapping images of the acute-angled Au@Ag nanokite. g TEM image of an obtuse-angled Au@Ag nanokite. h High-magnification TEM (HRTEM) image and corresponding FFT pattern (inset) of the obtuse-angled Au@Ag nanokite. i HRTEM image of the twin boundary of the obtuse-angled Au@Ag twinned nanokite. The twin boundary is marked in turquoise line. j STEM and k, l STEM-EDX elemental mapping images of the obtuse-angled Au@Ag nanokite. Scale bars, a, d 50 nm; b, h 20 nm; c, i 5 nm; g, j 100 nm