Figure 2.

a, b Low-magnification SEM images of Na7(H3O)Nb6O19ยท14H2O nanobelts, indicating the honeycomb-like micropattern. c, d High-magnification SEM images. e, f TEM images of a single nanobelt, exhibiting contrasty stripes along the growth direction. The nanobelts are composed of many smaller size nanobelts shown with a red circle.

Wu and Xue Nanoscale Res Lett 2011 6:14   doi:10.1007/s11671-010-9757-0