Fig. 4 The results of HRTEM and high-angle annular dark-field scanning TEM investigations. The results of HRTEM and high-angle annular dark-field scanning.

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Presentation transcript:

Fig. 4 The results of HRTEM and high-angle annular dark-field scanning TEM investigations. The results of HRTEM and high-angle annular dark-field scanning TEM investigations. (A and B) Aberration-corrected HRTEM images of the diamond nanoparticles. Scale bars, 5 nm. (A) The boundaries between the individual diamond grains (marked with black arrows) are not coherent and often appear to be disordered. White arrows indicate the {111} twin planes. (B) Surface layer around the diamond nanoparticles forming fullerene-like reconstructions (marked with arrows). (C) High-angle annular dark-field scanning TEM (HAADF-STEM) image of a typical region of the diamond nanocrystals. Scale bar, 5 nm. This region was scanned using spatially resolved EELS, collecting the carbon-K edge. (D) Color map of the EELS signal depicting the sp3-bonded carbon in green and the sp2-bonded carbon in red. The color map was generated by fitting each pixel in the acquired EELS data set with a diamond and amorphous carbon spectral reference in a linear combination and plotting the diamond component strength in green and the amorphous carbon component strength in red. (E) EELS spectra measured from the areas indicated in (D), showing the fine structure of the C-K edge along with the standard spectra from diamond, graphite, and amorphous carbon. The spectrum from region 1 corresponds to diamond-like sp3-bonded carbon, that from region 2 is a combination of the diamond and graphitic-like contributions, and that from region 3 is reminiscent of graphitic-like sp2-bonded carbon. Natalia Dubrovinskaia et al. Sci Adv 2016;2:e1600341 Copyright © 2016, The Authors