80 100 120 140 160 180 200 Energy loss (eV)

Figure 6. (A) A schematic illustration of a coaxial nanocable. (B) Si-L fine structure obtained from a nanocable with electron probe positions as indicated by arrows in (A). Spectrum c is obtained by subtracting a from b, representing a contribution from the core of the nanocable. Reference spectra from pure SiO2 and SiC phases are displayed for comparison. Reprinted with permission from [10], Y. Zhang et al., Science 281, 973 (1998). © 1998, American Association for the Advancement of Science.

structure, also form in the product. Using the same methods, BN and (BN)xCy nanotubes filled with boron carbide [113] and (BN)xCy nanotubes filled with iron boride [114] have been prepared. Other similar structures, such as Fe filled C-BN [115] and BN nanotubes [116], Fe-Ni alloy filled BN nanotubes [116], Mo filled BN nanotubes [117], Al2O3 filled BN nanotubes [118], GaN filled BN nanotubes [119], BN nanotubes filled with SiC and SiN [120], and ZrO2 filled BN nanotubes [121] have also been reported. C60 filled BN nanotubes have been theoretically studied and experimentally achieved [122, 123].

Hofmann et al.

found Ni17S18

filled MoS nanotubes combined with sulfide nanowires when they checked nano-structures on processed, sulfur contaminated Mo grids. Carbon is found both in the outer walls and in the core of the wire [124].

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