Figure 2

(a) High resolution TEM image of a catalyst particle within a BHCNT. Note the difference between the exterior, which encapsulates the catalyst and interior of the structure. (b) High resolution TEM image of a BHCNT with labeled crystallographic spacings. The white arrows [not to scale] indicate the direction of the spacings. Insets: Boron and carbon electron energy loss spectroscopy maps from the BHCNT. Note the boron and carbon are mostly found on the inside and outside of the BHCNT, respectively.