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Cross-sectional TEM images and size distribution of Co–Au NCs. The lower panels show the existence of Co–Au core-shell NCs as well as monoelemental NCs. The high-resolution image of a Co–Au core-shell NC reveals a significant bending of the lattice fringes consistent with high strain.
Cross-sectional TEM images and size distributions of (a) Au NCs and (b) Co NCs.
Non-phase corrected Fourier transformed EXAFS spectra of (a) Au film, Au NCs, and Co–Au NCs at the Au edge ( weighted) and (b) Co film, Co NCs, and Co–Au NCs at the Co edge ( weighted). The solid lines show the corresponding first-shell fits. The insets show bond lengths and Debye-Waller factors as given in Table I.
Refined fitting parameters from EXAFS analysis of the first coordination shell of metal film and NC samples. , , and are the coordination number, bond length, and Debye-Waller factor, respectively.
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