Figure 9From: Single-crystalline nanoporous Nb2O5 nanotubes Optical properties of Nb 2 O 5 nanorod precursors and nanotube products. UV-Vis spectra (a) and the corresponding (αhv)2 versus photo energy (hv) plots (b) of Nb2O5 nanorods and nanotubes measured at room temperature.Back to article page