Figure 8.

a Ultraviolet–visible spectrum of the as-grown BNNTs (reflection mode). Cathodoluminescence spectra recorded from the tubular parts of b bamboo-shaped BNNTs and c cylindrical BNNTs at room temperature. d A schematic energy level diagram of BNNTs.

Zhong et al. Nanoscale Res Lett 2011 6:36   doi:10.1007/s11671-010-9794-8