by Matthew F. Chisholm, Yuhuang Wang, Andrew R

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Presentation transcript:

Comment on "Single Crystals of Single-Walled Carbon Nanotubes Formed by Self-Assembly" by Matthew F. Chisholm, Yuhuang Wang, Andrew R. Lupini, Gyula Eres, Alex A. Puretzky, Bruce Brinson, Anatoli V. Melechko, David B. Geohegan, Hongtao Cui, Marie P. Johnson, Stephen J. Pennycook, Douglas H. Lowndes, Sivaram Arepalli, Carter Kittrell, Saujan Sivaram, Myung Kim, Gerry Lavin, Junichiro Kono, Robert Hauge, and Richard E. Smalley Science Volume 300(5623):1236-1236 May 23, 2003 Published by AAAS

Fig. 1. C60/Ni multilayer stacks patterned on a Mo TEM grid (A) before and (B) after thermolysis. C60/Ni multilayer stacks patterned on a Mo TEM grid (A) before and (B) after thermolysis. (C) Faceted crystals observed on regions of Mo TEM grids (away from the multilayer stacks) after thermolysis treatments. Matthew F. Chisholm et al. Science 2003;300:1236 Published by AAAS

Fig. 2. (A) Bright-field TEM image of long, faceted crystals observed after annealing. (A) Bright-field TEM image of long, faceted crystals observed after annealing. (B) Enlarged view of region indicated by red square in (A), showing longitudinal fringes observed parallel to the long axis of the crystals. (C and D) HAADF (Z-contrast) STEM images show longitudinal fringes and reveal crystal planes parallel to facets. (E) Typical EEL spectra from a typical nanocrystal shows Mo, Ca, O, and possible C. An EEL spectrum from the Mo grid near the nanocrystal is shown for comparison. C from contamination on the edge of the nanocrystal is similar to the spectrum in (1), but is not representative of graphitized C as expected from SWCNT (a spectrum from SWCNT bundles produced by laser vaporization is shown for comparison). Matthew F. Chisholm et al. Science 2003;300:1236 Published by AAAS

Fig. 3. (A) Electron diffraction pattern from crystal with longitudinal fringes. (A) Electron diffraction pattern from crystal with longitudinal fringes. (B) Enlarged view yielding major lattice spacings a = 2.6 Å, b = 10.1 Å, and superlattice reflections at 1/3, 1/2, and 2/3 of reciprocal lattice spacing a–1. (C) Simulated electron diffraction pattern from the projection of the Ca5.45Mo18O32 structure shown in (D), in which a = 2.8 Å, b = 11.4 Å. Matthew F. Chisholm et al. Science 2003;300:1236 Published by AAAS